G1 supplement from A7
Test-summary
0 of 10 questions completed
Questions:
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
Information
test
You have already completed the quiz before. Hence you can not start it again.
Test is loading...
You must sign in or sign up to start the quiz.
You have to finish following quiz, to start this quiz:
Results
0 of 10 questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 points, (0)
Categories
- Battery and Starting System Diagnosis and Repair 0%
- Body Electrical Systems Diagnosis and Repair 0%
- Charging System Diagnosis and Repair 0%
- Clutch Diagnosis and Repair 0%
- General Electrical/Electronic System Diagnosis 0%
- General Engine Diagnosis 0%
- Heating and Air Conditioning 0%
- Heating, Ventilation, A/C (HVAC) and Engine Cooling System Service, Diagnosis, and Repair 0%
- Instrument Cluster and Driver Information Systems Diagnosis and Repair 0%
- Lighting Systems Diagnosis and Repair 0%
- Operating Systems and Related Controls Diagnosis and Repair 0%
- Refrigeration System Component Diagnosis and Repair 0%
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- Answered
- Review
-
Question 1 of 10
1. Question
Category: Heating and Air ConditioningWhich of the following statements about automotive air conditioning (A/C) systems is NOT correct?
CorrectThe correct answer is A. Variable displacement compressors always operate at full capacity regardless of cooling demand: This statement is incorrect because variable displacement compressors adjust their displacement to match the cooling demand. They do not always operate at full capacity. Instead, they vary the amount of refrigerant being compressed to maintain the desired temperature efficiently, which improves fuel economy and system performance.
Incorrect Answers:
Answer B: Orifice tube systems use a fixed orifice to regulate refrigerant flow into the evaporator: This statement is correct. In orifice tube A/C systems, a fixed orifice tube regulates the flow of refrigerant into the evaporator. The orifice creates a pressure drop, causing the refrigerant to expand and cool as it enters the evaporator.
Answer C: Thermal expansion valve (TXV) systems adjust refrigerant flow based on evaporator temperature: This statement is correct. TXV systems use a thermal expansion valve to regulate the flow of refrigerant into the evaporator based on the temperature of the evaporator. This allows for more precise control of the refrigerant flow, leading to more efficient cooling and better performance under varying conditions.
Answer D: Dual-zone A/C systems allow different temperature settings for the driver and passenger sides: This statement is correct. Dual-zone A/C systems provide separate temperature controls for the driver and passenger sides, allowing each occupant to set their preferred temperature independently. This enhances comfort by accommodating individual preferences within the same vehicle.
IncorrectThe correct answer is A. Variable displacement compressors always operate at full capacity regardless of cooling demand: This statement is incorrect because variable displacement compressors adjust their displacement to match the cooling demand. They do not always operate at full capacity. Instead, they vary the amount of refrigerant being compressed to maintain the desired temperature efficiently, which improves fuel economy and system performance.
Incorrect Answers:
Answer B: Orifice tube systems use a fixed orifice to regulate refrigerant flow into the evaporator: This statement is correct. In orifice tube A/C systems, a fixed orifice tube regulates the flow of refrigerant into the evaporator. The orifice creates a pressure drop, causing the refrigerant to expand and cool as it enters the evaporator.
Answer C: Thermal expansion valve (TXV) systems adjust refrigerant flow based on evaporator temperature: This statement is correct. TXV systems use a thermal expansion valve to regulate the flow of refrigerant into the evaporator based on the temperature of the evaporator. This allows for more precise control of the refrigerant flow, leading to more efficient cooling and better performance under varying conditions.
Answer D: Dual-zone A/C systems allow different temperature settings for the driver and passenger sides: This statement is correct. Dual-zone A/C systems provide separate temperature controls for the driver and passenger sides, allowing each occupant to set their preferred temperature independently. This enhances comfort by accommodating individual preferences within the same vehicle.
-
Question 2 of 10
2. Question
Category: Heating and Air ConditioningA vehicle’s air conditioning (A/C) system emits a musty smell when turned on. Which of these could be the cause?
CorrectThe correct answer is B. The musty smell coming from the A/C system is most often caused by mold or mildew growth within the evaporator core. The evaporator is a moist, dark environment, making it an ideal breeding ground for mold and mildew. When the A/C is turned on, air passes over the evaporator core, carrying the mold or mildew smell into the cabin. Cleaning the evaporator core and ensuring proper drainage can eliminate this odor.
Incorrect Answers:
Answer A: While a refrigerant leak can cause a chemical smell, it would not typically result in a musty odor. Refrigerant leaks are more likely to produce a sweet or chloroform-like smell and would be accompanied by a decrease in cooling performance. Therefore, it is not the correct cause for a musty smell specifically.
Answer C: A clogged cabin air filter can restrict airflow and potentially lead to unpleasant smells, but it is less likely to cause a musty odor. The filter itself may become dirty and introduce some odors, but the musty smell is more directly associated with mold or mildew within the evaporator core. Replacing the cabin air filter is a good maintenance practice but would not address the underlying cause of the musty smell.
Answer D: A failing A/C compressor can cause mechanical noise and reduced cooling performance, but it would not be a source of musty smells. Compressor issues are generally related to the mechanical operation of the A/C system and do not produce the type of odor described. The musty smell is more likely due to biological growth within the system, specifically in the evaporator core.
IncorrectThe correct answer is B. The musty smell coming from the A/C system is most often caused by mold or mildew growth within the evaporator core. The evaporator is a moist, dark environment, making it an ideal breeding ground for mold and mildew. When the A/C is turned on, air passes over the evaporator core, carrying the mold or mildew smell into the cabin. Cleaning the evaporator core and ensuring proper drainage can eliminate this odor.
Incorrect Answers:
Answer A: While a refrigerant leak can cause a chemical smell, it would not typically result in a musty odor. Refrigerant leaks are more likely to produce a sweet or chloroform-like smell and would be accompanied by a decrease in cooling performance. Therefore, it is not the correct cause for a musty smell specifically.
Answer C: A clogged cabin air filter can restrict airflow and potentially lead to unpleasant smells, but it is less likely to cause a musty odor. The filter itself may become dirty and introduce some odors, but the musty smell is more directly associated with mold or mildew within the evaporator core. Replacing the cabin air filter is a good maintenance practice but would not address the underlying cause of the musty smell.
Answer D: A failing A/C compressor can cause mechanical noise and reduced cooling performance, but it would not be a source of musty smells. Compressor issues are generally related to the mechanical operation of the A/C system and do not produce the type of odor described. The musty smell is more likely due to biological growth within the system, specifically in the evaporator core.
-
Question 3 of 10
3. Question
Category: Heating and Air ConditioningAn air conditioning (A/C) system produces a high-pitched squealing noise when the A/C is turned on. Which of these could be the cause?
CorrectThe correct answer is C. A high-pitched squealing noise when the A/C is turned on is often caused by a worn or slipping serpentine belt. The serpentine belt drives the A/C compressor, and if it is worn or not properly tensioned, it can slip on the pulleys, causing a squealing noise. Inspecting the belt for wear and proper tension, and replacing it if necessary, can resolve this issue.
Incorrect Answers:
Answer A: A clogged expansion valve can cause issues with the cooling performance of the A/C system, leading to symptoms like poor cooling or fluctuating temperatures. However, it is unlikely to produce a high-pitched squealing noise. The expansion valve regulates the flow of refrigerant into the evaporator but does not typically cause noise when malfunctioning.
Answer B: A low refrigerant level can cause the A/C system to perform poorly and might lead to compressor noise due to increased strain, but it generally does not cause a high-pitched squealing noise. Low refrigerant levels usually result in hissing or bubbling sounds, particularly near the evaporator or compressor, but not a squeal.
Answer D: A malfunctioning blower motor can cause noise, but it would be more likely to produce a grinding or rattling sound rather than a high-pitched squeal. The blower motor is responsible for circulating air through the HVAC system, and its noise issues are typically related to its bearings or fan assembly rather than the type of noise described.
IncorrectThe correct answer is C. A high-pitched squealing noise when the A/C is turned on is often caused by a worn or slipping serpentine belt. The serpentine belt drives the A/C compressor, and if it is worn or not properly tensioned, it can slip on the pulleys, causing a squealing noise. Inspecting the belt for wear and proper tension, and replacing it if necessary, can resolve this issue.
Incorrect Answers:
Answer A: A clogged expansion valve can cause issues with the cooling performance of the A/C system, leading to symptoms like poor cooling or fluctuating temperatures. However, it is unlikely to produce a high-pitched squealing noise. The expansion valve regulates the flow of refrigerant into the evaporator but does not typically cause noise when malfunctioning.
Answer B: A low refrigerant level can cause the A/C system to perform poorly and might lead to compressor noise due to increased strain, but it generally does not cause a high-pitched squealing noise. Low refrigerant levels usually result in hissing or bubbling sounds, particularly near the evaporator or compressor, but not a squeal.
Answer D: A malfunctioning blower motor can cause noise, but it would be more likely to produce a grinding or rattling sound rather than a high-pitched squeal. The blower motor is responsible for circulating air through the HVAC system, and its noise issues are typically related to its bearings or fan assembly rather than the type of noise described.
-
Question 4 of 10
4. Question
Category: Heating and Air ConditioningWhen charging an A/C system with refrigerant, Technician A says that you should add the refrigerant through the high-pressure service port. Technician B says that you should use the low-pressure service port while monitoring the system pressures. Who is right?
CorrectThe correct answer is B: Technician B is correct because refrigerant should always be added through the low-pressure service port. Charging through the low-pressure side allows the refrigerant to be drawn into the system safely and ensures proper mixing and distribution within the A/C system. Additionally, monitoring the system pressures during charging is essential to prevent overcharging and to verify that the system is operating within the manufacturer’s specified pressure range.
Incorrect Answers:
Answer A: Technician A is incorrect because adding refrigerant through the high-pressure service port is unsafe and can cause damage to the system. The high-pressure side of the system operates at much higher pressures, and attempting to add refrigerant through this port can result in an explosion or serious injury due to the high-pressure release of refrigerant.
Answer C: This answer is incorrect because, while Technician B is correct, Technician A is not. Adding refrigerant through the high-pressure port is dangerous and not the correct procedure.
Answer D: This answer is incorrect because Technician B’s statement is correct. Charging an A/C system should be done through the low-pressure service port while monitoring system pressures to ensure safe and accurate filling.
IncorrectThe correct answer is B: Technician B is correct because refrigerant should always be added through the low-pressure service port. Charging through the low-pressure side allows the refrigerant to be drawn into the system safely and ensures proper mixing and distribution within the A/C system. Additionally, monitoring the system pressures during charging is essential to prevent overcharging and to verify that the system is operating within the manufacturer’s specified pressure range.
Incorrect Answers:
Answer A: Technician A is incorrect because adding refrigerant through the high-pressure service port is unsafe and can cause damage to the system. The high-pressure side of the system operates at much higher pressures, and attempting to add refrigerant through this port can result in an explosion or serious injury due to the high-pressure release of refrigerant.
Answer C: This answer is incorrect because, while Technician B is correct, Technician A is not. Adding refrigerant through the high-pressure port is dangerous and not the correct procedure.
Answer D: This answer is incorrect because Technician B’s statement is correct. Charging an A/C system should be done through the low-pressure service port while monitoring system pressures to ensure safe and accurate filling.
-
Question 5 of 10
5. Question
Category: Heating and Air ConditioningAfter bleeding the coolant system of a vehicle, the technician notices that the heater is blowing cold air and the engine is running hotter than usual. Which of the following could be the cause?
CorrectThe correct answer is A. Air pockets can form in the cooling system if it is not properly bled. These air pockets can prevent coolant from circulating properly, leading to inefficient cooling of the engine and a lack of heat being transferred to the heater core. This results in the heater blowing cold air and the engine running hotter than normal. Ensuring all air is purged from the system during the bleeding process is crucial for optimal performance.
Incorrect Answers:
Answer B: An incorrect coolant mixture, such as one with too much water or antifreeze, can affect the boiling and freezing points of the coolant and its overall efficiency. However, this issue would not specifically cause the symptoms of a heater blowing cold air and an overheating engine immediately after bleeding the system. It is less likely to be the direct cause compared to air pockets.
Answer C: A faulty water pump can indeed cause overheating and poor coolant circulation. However, if the water pump was functioning properly before the bleeding process and no work was done on it, it is unlikely to suddenly fail right after bleeding the coolant system. It is a less probable cause in this specific scenario.
Answer D: A radiator cap that does not seal properly can lead to a loss of pressure in the cooling system, which can cause overheating and coolant loss. However, this issue typically manifests through other symptoms like visible coolant leaks or a drop in coolant levels over time, rather than immediately affecting the heater performance right after bleeding the system. It is less likely to be the primary cause in this context.
IncorrectThe correct answer is A. Air pockets can form in the cooling system if it is not properly bled. These air pockets can prevent coolant from circulating properly, leading to inefficient cooling of the engine and a lack of heat being transferred to the heater core. This results in the heater blowing cold air and the engine running hotter than normal. Ensuring all air is purged from the system during the bleeding process is crucial for optimal performance.
Incorrect Answers:
Answer B: An incorrect coolant mixture, such as one with too much water or antifreeze, can affect the boiling and freezing points of the coolant and its overall efficiency. However, this issue would not specifically cause the symptoms of a heater blowing cold air and an overheating engine immediately after bleeding the system. It is less likely to be the direct cause compared to air pockets.
Answer C: A faulty water pump can indeed cause overheating and poor coolant circulation. However, if the water pump was functioning properly before the bleeding process and no work was done on it, it is unlikely to suddenly fail right after bleeding the coolant system. It is a less probable cause in this specific scenario.
Answer D: A radiator cap that does not seal properly can lead to a loss of pressure in the cooling system, which can cause overheating and coolant loss. However, this issue typically manifests through other symptoms like visible coolant leaks or a drop in coolant levels over time, rather than immediately affecting the heater performance right after bleeding the system. It is less likely to be the primary cause in this context.
-
Question 6 of 10
6. Question
Category: Heating and Air ConditioningA vehicle’s heating system is not functioning, and the technician observes that the blower motor does not operate at any speed. Which of these could be the cause?
CorrectThe correct answer is A. A blown blower motor fuse would prevent electrical power from reaching the blower motor, causing it to fail to operate at any speed. The fuse is designed to protect the electrical circuit from overloads or short circuits. If the fuse is blown, it indicates that there may have been an overload or a short, and replacing the fuse is necessary to restore power to the blower motor. This is the most likely cause when the blower motor does not operate at all.
Incorrect Answers:
Answer B: A faulty blower motor resistor typically affects the operation of the blower motor at certain speeds. The resistor controls the voltage and current flowing to the blower motor at different speed settings. If the resistor is faulty, the blower motor may work at some speeds but not others. Since the blower motor does not operate at any speed, the issue is more likely related to a loss of power rather than a resistor failure.
Answer C: A malfunctioning blower motor switch can cause the blower motor to fail to operate, but it usually results in intermittent operation or issues at specific speed settings. If the switch is faulty, it may cause the blower motor to work sporadically or not at certain speeds. However, if the blower motor does not work at all, it is more indicative of a power supply issue, such as a blown fuse.
Answer D: A defective blower motor can cause the heating system to fail, but it is less likely to result in a complete lack of operation at all speeds unless the motor has completely failed. Typically, a defective motor may show signs of intermittent operation or unusual noises before failing completely. Given that the blower motor does not operate at any speed, a blown fuse is a more straightforward and likely cause.
IncorrectThe correct answer is A. A blown blower motor fuse would prevent electrical power from reaching the blower motor, causing it to fail to operate at any speed. The fuse is designed to protect the electrical circuit from overloads or short circuits. If the fuse is blown, it indicates that there may have been an overload or a short, and replacing the fuse is necessary to restore power to the blower motor. This is the most likely cause when the blower motor does not operate at all.
Incorrect Answers:
Answer B: A faulty blower motor resistor typically affects the operation of the blower motor at certain speeds. The resistor controls the voltage and current flowing to the blower motor at different speed settings. If the resistor is faulty, the blower motor may work at some speeds but not others. Since the blower motor does not operate at any speed, the issue is more likely related to a loss of power rather than a resistor failure.
Answer C: A malfunctioning blower motor switch can cause the blower motor to fail to operate, but it usually results in intermittent operation or issues at specific speed settings. If the switch is faulty, it may cause the blower motor to work sporadically or not at certain speeds. However, if the blower motor does not work at all, it is more indicative of a power supply issue, such as a blown fuse.
Answer D: A defective blower motor can cause the heating system to fail, but it is less likely to result in a complete lack of operation at all speeds unless the motor has completely failed. Typically, a defective motor may show signs of intermittent operation or unusual noises before failing completely. Given that the blower motor does not operate at any speed, a blown fuse is a more straightforward and likely cause.
-
Question 7 of 10
7. Question
Category: Heating and Air ConditioningAn engine overheats when idling but cools down when driving at highway speeds. The technician finds that the engine cooling fan does not activate when the engine reaches operating temperature. Which of these could be the cause?
CorrectThe correct answer is B. The engine cooling fan relay is responsible for providing power to the fan motor when the engine reaches a certain temperature. If the relay is faulty, it can prevent the fan from turning on, causing the engine to overheat at idle when there is no airflow through the radiator. At highway speeds, the natural airflow helps cool the engine, which is why it only overheats at idle. Therefore, a faulty cooling fan relay is the most likely cause.
Incorrect Answers:
Answer A: A blown fuse would prevent the cooling fan from operating altogether, but the problem description suggests intermittent operation depending on the vehicle’s speed. If the fuse were blown, the fan would not work at any time, not just at idle.
Answer C: A malfunctioning coolant temperature sensor can cause the cooling fan to not activate correctly. However, this issue would likely result in trouble codes and affect other aspects of engine management. The specific symptom of the fan not activating at idle but functioning at highway speeds points more directly to the relay.
Answer D: A defective cooling fan motor would prevent the fan from operating at all times. Since the problem is specific to the fan not activating at idle, it suggests that the motor itself is likely functional, but the control circuit (specifically the relay) is failing to activate it when needed.
IncorrectThe correct answer is B. The engine cooling fan relay is responsible for providing power to the fan motor when the engine reaches a certain temperature. If the relay is faulty, it can prevent the fan from turning on, causing the engine to overheat at idle when there is no airflow through the radiator. At highway speeds, the natural airflow helps cool the engine, which is why it only overheats at idle. Therefore, a faulty cooling fan relay is the most likely cause.
Incorrect Answers:
Answer A: A blown fuse would prevent the cooling fan from operating altogether, but the problem description suggests intermittent operation depending on the vehicle’s speed. If the fuse were blown, the fan would not work at any time, not just at idle.
Answer C: A malfunctioning coolant temperature sensor can cause the cooling fan to not activate correctly. However, this issue would likely result in trouble codes and affect other aspects of engine management. The specific symptom of the fan not activating at idle but functioning at highway speeds points more directly to the relay.
Answer D: A defective cooling fan motor would prevent the fan from operating at all times. Since the problem is specific to the fan not activating at idle, it suggests that the motor itself is likely functional, but the control circuit (specifically the relay) is failing to activate it when needed.
-
Question 8 of 10
8. Question
Category: Heating and Air ConditioningAn HVAC multi-zone system is experiencing uneven temperatures between the driver and passenger sides, with the driver side unable to cool down properly. Which of these could be the cause?
CorrectThe correct answer is A. In a multi-zone HVAC system, the blend door actuator controls the mix of hot and cold air for each specific zone. If the driver side blend door actuator is malfunctioning, it may not move correctly to allow sufficient cold air to mix, resulting in the driver side failing to cool down properly. This directly affects the ability of the system to maintain the desired temperature on the driver side while the passenger side may still function correctly.
Incorrect Answers:
Answer B: A faulty passenger side temperature sensor would affect the temperature regulation for the passenger side, potentially causing incorrect temperature readings and adjustments. However, it would not explain the issue on the driver side, where the cooling problem is occurring. The problem is localized to the driver side, indicating an issue with the driver side components.
Answer C: A clogged cabin air filter can restrict airflow through the entire HVAC system, potentially reducing the overall effectiveness of heating and cooling. However, it would affect both sides of the multi-zone system equally, not just the driver side. The issue described is specific to the driver side, pointing towards a problem with the driver side components rather than a general airflow issue.
Answer D: An overcharged refrigerant system can lead to poor cooling performance overall due to excessive pressure within the system, but it would not specifically cause one side of a multi-zone system to fail to cool while the other side operates correctly. The issue described indicates a localized problem on the driver side, which is best explained by a malfunctioning driver side blend door actuator.
IncorrectThe correct answer is A. In a multi-zone HVAC system, the blend door actuator controls the mix of hot and cold air for each specific zone. If the driver side blend door actuator is malfunctioning, it may not move correctly to allow sufficient cold air to mix, resulting in the driver side failing to cool down properly. This directly affects the ability of the system to maintain the desired temperature on the driver side while the passenger side may still function correctly.
Incorrect Answers:
Answer B: A faulty passenger side temperature sensor would affect the temperature regulation for the passenger side, potentially causing incorrect temperature readings and adjustments. However, it would not explain the issue on the driver side, where the cooling problem is occurring. The problem is localized to the driver side, indicating an issue with the driver side components.
Answer C: A clogged cabin air filter can restrict airflow through the entire HVAC system, potentially reducing the overall effectiveness of heating and cooling. However, it would affect both sides of the multi-zone system equally, not just the driver side. The issue described is specific to the driver side, pointing towards a problem with the driver side components rather than a general airflow issue.
Answer D: An overcharged refrigerant system can lead to poor cooling performance overall due to excessive pressure within the system, but it would not specifically cause one side of a multi-zone system to fail to cool while the other side operates correctly. The issue described indicates a localized problem on the driver side, which is best explained by a malfunctioning driver side blend door actuator.
-
Question 9 of 10
9. Question
Category: Heating and Air ConditioningA vehicle experiences overheating issues, particularly during stop-and-go traffic or idling. The cooling system has been thoroughly inspected, including the radiator, thermostat, water pump, and coolant condition. All components are functioning correctly. Which of the following is the most likely cause?
CorrectThe correct answer is C. A cooling fan motor that is not operating at full capacity or is failing can lead to inadequate cooling, especially in stop-and-go traffic or during idle when the vehicle relies heavily on the fan for cooling.
Incorrect Answers:
Answer A: A faulty temperature sensor would provide inaccurate readings but would not directly cause overheating.
Answer B: A restricted coolant flow would typically cause consistent overheating, not overheating under specific conditions.
Answer D: A malfunctioning engine control module could affect fan operation but would likely cause other issues as well, not just overheating under specific conditions.
IncorrectThe correct answer is C. A cooling fan motor that is not operating at full capacity or is failing can lead to inadequate cooling, especially in stop-and-go traffic or during idle when the vehicle relies heavily on the fan for cooling.
Incorrect Answers:
Answer A: A faulty temperature sensor would provide inaccurate readings but would not directly cause overheating.
Answer B: A restricted coolant flow would typically cause consistent overheating, not overheating under specific conditions.
Answer D: A malfunctioning engine control module could affect fan operation but would likely cause other issues as well, not just overheating under specific conditions.
-
Question 10 of 10
10. Question
Category: Heating and Air ConditioningWhich of the following statements about A/C system desiccant is NOT correct?
CorrectThe correct answer is D. This statement is NOT correct because the desiccant does not regulate the flow of refrigerant through the A/C system. The desiccant’s primary function is to absorb moisture from the refrigerant to prevent corrosion and freezing. The flow of refrigerant is regulated by components such as the expansion valve or orifice tube, not by the desiccant.
Incorrect Answers:
Answer A: The primary purpose of the desiccant is to absorb moisture from the refrigerant, which helps prevent corrosion and other moisture-related damage within the A/C system.
Answer B: The desiccant is typically housed within the receiver/drier in expansion valve systems or the accumulator in orifice tube systems. Its location allows it to effectively remove moisture from the refrigerant as it circulates through the system.
Answer C: When the A/C system is opened for repairs, the desiccant can become saturated with moisture from the atmosphere. Therefore, it is recommended to replace the desiccant to ensure the continued protection and efficiency of the A/C system after repairs are completed.
IncorrectThe correct answer is D. This statement is NOT correct because the desiccant does not regulate the flow of refrigerant through the A/C system. The desiccant’s primary function is to absorb moisture from the refrigerant to prevent corrosion and freezing. The flow of refrigerant is regulated by components such as the expansion valve or orifice tube, not by the desiccant.
Incorrect Answers:
Answer A: The primary purpose of the desiccant is to absorb moisture from the refrigerant, which helps prevent corrosion and other moisture-related damage within the A/C system.
Answer B: The desiccant is typically housed within the receiver/drier in expansion valve systems or the accumulator in orifice tube systems. Its location allows it to effectively remove moisture from the refrigerant as it circulates through the system.
Answer C: When the A/C system is opened for repairs, the desiccant can become saturated with moisture from the atmosphere. Therefore, it is recommended to replace the desiccant to ensure the continued protection and efficiency of the A/C system after repairs are completed.