ASE AC 609 EXAM 70 QUESTIONS & CORRECT
ANSWERS LATEST 2025
1. Technician A says that evacuating an A/C system will remove air and moisture
from the system. Technician B says that evacuating an A/C system will remove dirt
particles from the system. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER-A
2. There is a growling or rumbling noise at the A/C compressor when the system is
off and the engine is running. The noise stops when the system is turned on.
Technician A says that a bad compressor bearing could be the cause. Technician B
says that a bad compressor clutch bearing could be the cause. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER-b
3. The readings shown above are taken with the A/C system operating at an
ambient (outside) temperature of 85°F (29°C). What do the readings indicate?
A. normal operation
B. low refrigerant level
,C. a restriction in the high side
D. damaged compressor - ANSWER-b
4. Recovery/recycling equipment must have shutoff valves located within 12-in.
(30 cm) of the hoses' service ends so that:
A. oil can be added to the refrigerant
B. the unit can be isolated from the refrigerantsource
C. the filter can be changed without disconnecting the hoses
D. refrigerant discharge can be kept to a minimum - ANSWER-d
5. When recovering refrigerant from an A/C system, how long should the
technician wait after the recovery/ recycling unit has been turned off to see if
there is any residual pressure in the system?
A. 1 minute
B. 5 minutes
C. 10 minutes
D. 15 minutes - ANSWER-b
6. A system with a low pressure on the low side anda heavy frost accumulation on
the inlet side of the Thermostatic Expansion Valve (TXV) indicates a:
A. TXV stuck open
B. clogged condenser
C. defective compressor
D. clogged screen or TXV stuck closed - ANSWER-d
, 7. A blower motor only works on high speed. Which ofthe following causes is the
MOST LIKELY?
A. defective blower relay
B. defective blower resistor
C. defective blower switch
D. blown fuse or tripped circuit breaker - ANSWER-b
8. A customer complains that when accelerating his car with the A/C on, the cold
air flow from the dash outlets shifts to the floor. Technician A says that this is
caused by a faulty check valve in the vacuum reservoir. Technician B says that this
condition is due to a vacuum leak. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER-c
9. When pressure testing the cooling system on a late model gasoline engine
vehicle, the pressure on the tester drops but no leaks can be found in the engine
compartment. Technician A starts the engine and, seeing the pressure on the
tester gauge increase, says that there is an internal leak, a blown head gasket.
Technician B says that there cannot be an internal leak because the engine oil
looks normal, not milky like it would be if coolant were present, and there is no
white smoke coming from the exhaust pipe. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER-a
ANSWERS LATEST 2025
1. Technician A says that evacuating an A/C system will remove air and moisture
from the system. Technician B says that evacuating an A/C system will remove dirt
particles from the system. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER-A
2. There is a growling or rumbling noise at the A/C compressor when the system is
off and the engine is running. The noise stops when the system is turned on.
Technician A says that a bad compressor bearing could be the cause. Technician B
says that a bad compressor clutch bearing could be the cause. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER-b
3. The readings shown above are taken with the A/C system operating at an
ambient (outside) temperature of 85°F (29°C). What do the readings indicate?
A. normal operation
B. low refrigerant level
,C. a restriction in the high side
D. damaged compressor - ANSWER-b
4. Recovery/recycling equipment must have shutoff valves located within 12-in.
(30 cm) of the hoses' service ends so that:
A. oil can be added to the refrigerant
B. the unit can be isolated from the refrigerantsource
C. the filter can be changed without disconnecting the hoses
D. refrigerant discharge can be kept to a minimum - ANSWER-d
5. When recovering refrigerant from an A/C system, how long should the
technician wait after the recovery/ recycling unit has been turned off to see if
there is any residual pressure in the system?
A. 1 minute
B. 5 minutes
C. 10 minutes
D. 15 minutes - ANSWER-b
6. A system with a low pressure on the low side anda heavy frost accumulation on
the inlet side of the Thermostatic Expansion Valve (TXV) indicates a:
A. TXV stuck open
B. clogged condenser
C. defective compressor
D. clogged screen or TXV stuck closed - ANSWER-d
, 7. A blower motor only works on high speed. Which ofthe following causes is the
MOST LIKELY?
A. defective blower relay
B. defective blower resistor
C. defective blower switch
D. blown fuse or tripped circuit breaker - ANSWER-b
8. A customer complains that when accelerating his car with the A/C on, the cold
air flow from the dash outlets shifts to the floor. Technician A says that this is
caused by a faulty check valve in the vacuum reservoir. Technician B says that this
condition is due to a vacuum leak. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER-c
9. When pressure testing the cooling system on a late model gasoline engine
vehicle, the pressure on the tester drops but no leaks can be found in the engine
compartment. Technician A starts the engine and, seeing the pressure on the
tester gauge increase, says that there is an internal leak, a blown head gasket.
Technician B says that there cannot be an internal leak because the engine oil
looks normal, not milky like it would be if coolant were present, and there is no
white smoke coming from the exhaust pipe. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER-a
