ASE A7 Heating Air Conditioning Practice 50
Multiple Choice Questions 2025-2026
1. An airbag system needs to be disarmed during an C.
evaporator core replacement. Technician A says that
it is necessary to remove power from the system prior
to component removal.
Technician B says that the inflatable devices should
be laid "face up" in a secure area after being removed
from a vehicle. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
2. An orifice tube performs any of these jobs in the A/C D. (the orifice tube does not
system EXCEPT: open and close. it is a fixed
restriction that meters re-
A. Meters refrigerant into the evaporator core frigerant into the evaporator
B. Filters foreign particles core)
C. Separates the high side from the low side
D. Opens and closes to regulate pressure on the low
side
3. A technician connects a scan tool to a late-model A.
vehicle to troubleshoot a problem in the ATC sys-
tem. The scan tool gives a fault of "data bus short to
ground." Technician A says that the problem could be
a data wire rubbing against a sharp body component.
Technician B says that the problem could be a broken
data wire. Who is correct?
A. A only
B. B only
, ASE A7 Heating Air Conditioning Practice 50
Multiple Choice Questions 2025-2026
C. Both A and B
D. Neither A nor B
4. Any of these methods of R134a A/C system leak de- D.
tection are acceptable EXCEPT:
A. Dye and black light
B. Electronic leak detector
C. Nitrogen and soapy water
D. Propane burner
5. Technician A says that an electronic blend door motor B. (Electronic blend door
uses an analog signal to open and close. Technician motors use some sort of
B says that an electronic mode door motor uses a feedback device. A poten-
feedback device to indicate the position of the door. tiometer is typically used to
Who is right? signal the HVAC control de-
vice the correct door posi-
A. A only tion)
B. B only
C. Both A and B
D. Neither A nor B
6. What is the most likely cause for a serpentine drive C.
belt to slip under heavy loads?
A. Surface cracks on the inside of the belt
B. Belt is stretched one-quarter inch
C. Seized tensioner
D. Glazed belt
7. Any of these practices should be followed when inter- C.
acting with airbag system components EXCEPT:
, ASE A7 Heating Air Conditioning Practice 50
Multiple Choice Questions 2025-2026
A. Unhook the negative battery cable prior to begin-
ning work.
B. Store inflatable components "face up" in a secure
area.
C. Disconnect the airbag indicator prior to beginning
work.
D. Carefully carry inflatable components holding
them away from the body.
8. Any of these are methods to verify that the evapora- D. (A refrigerant identifier is
tor core is leaking EXCEPT: used to test the A/C system
for impurities)
A. Using an electronic leak detector at the A/C duct
outlets
B. Using an ultrasonic leak detector at the HVAC case
drain tube
C. Injecting dye into the system and using a black
light to inspect the substance exiting the HVAC case
drain tube
D. Using a refrigerant identifier at the low-side fitting
9. A vehicle with rear heat and air has a rear heater that C.
does not get warm enough. Technician A says that a
crimped heater pipe could be the cause. Technician
B says that a partially blocked rear heater core could
be the cause. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
10.
Multiple Choice Questions 2025-2026
1. An airbag system needs to be disarmed during an C.
evaporator core replacement. Technician A says that
it is necessary to remove power from the system prior
to component removal.
Technician B says that the inflatable devices should
be laid "face up" in a secure area after being removed
from a vehicle. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
2. An orifice tube performs any of these jobs in the A/C D. (the orifice tube does not
system EXCEPT: open and close. it is a fixed
restriction that meters re-
A. Meters refrigerant into the evaporator core frigerant into the evaporator
B. Filters foreign particles core)
C. Separates the high side from the low side
D. Opens and closes to regulate pressure on the low
side
3. A technician connects a scan tool to a late-model A.
vehicle to troubleshoot a problem in the ATC sys-
tem. The scan tool gives a fault of "data bus short to
ground." Technician A says that the problem could be
a data wire rubbing against a sharp body component.
Technician B says that the problem could be a broken
data wire. Who is correct?
A. A only
B. B only
, ASE A7 Heating Air Conditioning Practice 50
Multiple Choice Questions 2025-2026
C. Both A and B
D. Neither A nor B
4. Any of these methods of R134a A/C system leak de- D.
tection are acceptable EXCEPT:
A. Dye and black light
B. Electronic leak detector
C. Nitrogen and soapy water
D. Propane burner
5. Technician A says that an electronic blend door motor B. (Electronic blend door
uses an analog signal to open and close. Technician motors use some sort of
B says that an electronic mode door motor uses a feedback device. A poten-
feedback device to indicate the position of the door. tiometer is typically used to
Who is right? signal the HVAC control de-
vice the correct door posi-
A. A only tion)
B. B only
C. Both A and B
D. Neither A nor B
6. What is the most likely cause for a serpentine drive C.
belt to slip under heavy loads?
A. Surface cracks on the inside of the belt
B. Belt is stretched one-quarter inch
C. Seized tensioner
D. Glazed belt
7. Any of these practices should be followed when inter- C.
acting with airbag system components EXCEPT:
, ASE A7 Heating Air Conditioning Practice 50
Multiple Choice Questions 2025-2026
A. Unhook the negative battery cable prior to begin-
ning work.
B. Store inflatable components "face up" in a secure
area.
C. Disconnect the airbag indicator prior to beginning
work.
D. Carefully carry inflatable components holding
them away from the body.
8. Any of these are methods to verify that the evapora- D. (A refrigerant identifier is
tor core is leaking EXCEPT: used to test the A/C system
for impurities)
A. Using an electronic leak detector at the A/C duct
outlets
B. Using an ultrasonic leak detector at the HVAC case
drain tube
C. Injecting dye into the system and using a black
light to inspect the substance exiting the HVAC case
drain tube
D. Using a refrigerant identifier at the low-side fitting
9. A vehicle with rear heat and air has a rear heater that C.
does not get warm enough. Technician A says that a
crimped heater pipe could be the cause. Technician
B says that a partially blocked rear heater core could
be the cause. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
10.
