ASE A7 Heating and Air Conditioning
Practice Exam 100 Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
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1. What is the primary purpose of refrigerant recovery equipment?
A. To clean the refrigerant before recharging the system
B. To remove refrigerant from the system and store it for reuse
C. To convert R-12 refrigerant to R-134a
D. To identify leaks in the A/C system
B. To remove refrigerant from the system and store it for reuse
Refrigerant recovery equipment is designed to safely remove
refrigerant from an A/C system and store it in an approved container.
This is required by EPA Section 609 regulations before opening the
system for service.
2. Which refrigerant has been the industry standard for automotive A/C
systems since the mid-1990s?
A. R-12 (CFC-12)
B. R-1234yf (HFO-1234yf)
C. R-134a (HFC-134a)
D. R-22 (HCFC-22)
C. R-134a (HFC-134a)
R-134a became the industry standard refrigerant for automotive A/C
systems in the mid-1990s, replacing R-12 due to environmental
concerns. R-134a is an HFC that does not deplete the ozone layer.
3. What is the minimum evacuation level typically required for a properly
functioning A/C system before recharging?
, A. 1,000 microns
B. 100 microns
C. 500 microns
D. 2,000 microns
C. 500 microns
Most manufacturers recommend evacuating an A/C system to at least
500 microns (0.5 mmHg) before recharging. This ensures that air and
moisture are adequately removed from the system.
4. What color is the low-pressure service port cap on most R-134a systems?
A. Red
B. Blue
C. Yellow
D. Green
B. Blue
On R-134a systems, the low-pressure service port is typically identified
by a blue cap, while the high-pressure port has a red cap. This color-
coding helps prevent connection errors.
5. What federal regulation requires technicians to be certified to purchase
or handle refrigerants?
A. Clean Air Act Section 612
B. OSHA Standard 1910.1200
C. EPA Section 609
D. DOT 49 CFR
C. EPA Section 609
EPA Section 609 requires technicians to be certified to purchase or
handle refrigerants used in motor vehicle air conditioning systems.
6. An EATC air conditioning system has low fan speed operation during
high-demand situations, like in direct sunlight. Technician A says this is
because debris and loose papers on the dashboard are blocking the sun
load sensor's photodiode. Technician B says to test the sun load sensor
with an ohmmeter. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
, D. Neither A nor B
C. Both A and B
The sun load sensor is a photosensitive diode placed on the dash that
changes resistance according to its exposure to sunlight. Debris can
block it, and testing with an ohmmeter is a valid diagnostic step.
7. There's a gurgling sound inside a vehicle's dashboard. Technician A says
an air pocket in the heater core could be the cause. Technician B says this
could be the result of a leaking head gasket. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
C. Both A and B
A gurgling sound occurs when air enters the heater core. This condition
can also be caused by a blown head gasket forcing compression into
the engine's cooling system.
8. A manifold gauge indicates a system has low discharge pressure. The
MOST likely cause of this condition is:
A. A restricted condenser
B. A loose fan belt
C. A damaged compressor reed valve
D. A broken compressor piston
C. A damaged compressor reed valve
Damaged reed valves or plates result in low discharge pressure. A
restricted condenser or loose fan belt would cause high high-side
pressure.
9. The compressor rapidly cycles on and off on a CCOT air conditioning
system. Technician A says this condition can be caused by a low
refrigerant charge. Technician B says this could be caused by a faulty
clutch cycling switch. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
Practice Exam 100 Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
Download Pdf
1. What is the primary purpose of refrigerant recovery equipment?
A. To clean the refrigerant before recharging the system
B. To remove refrigerant from the system and store it for reuse
C. To convert R-12 refrigerant to R-134a
D. To identify leaks in the A/C system
B. To remove refrigerant from the system and store it for reuse
Refrigerant recovery equipment is designed to safely remove
refrigerant from an A/C system and store it in an approved container.
This is required by EPA Section 609 regulations before opening the
system for service.
2. Which refrigerant has been the industry standard for automotive A/C
systems since the mid-1990s?
A. R-12 (CFC-12)
B. R-1234yf (HFO-1234yf)
C. R-134a (HFC-134a)
D. R-22 (HCFC-22)
C. R-134a (HFC-134a)
R-134a became the industry standard refrigerant for automotive A/C
systems in the mid-1990s, replacing R-12 due to environmental
concerns. R-134a is an HFC that does not deplete the ozone layer.
3. What is the minimum evacuation level typically required for a properly
functioning A/C system before recharging?
, A. 1,000 microns
B. 100 microns
C. 500 microns
D. 2,000 microns
C. 500 microns
Most manufacturers recommend evacuating an A/C system to at least
500 microns (0.5 mmHg) before recharging. This ensures that air and
moisture are adequately removed from the system.
4. What color is the low-pressure service port cap on most R-134a systems?
A. Red
B. Blue
C. Yellow
D. Green
B. Blue
On R-134a systems, the low-pressure service port is typically identified
by a blue cap, while the high-pressure port has a red cap. This color-
coding helps prevent connection errors.
5. What federal regulation requires technicians to be certified to purchase
or handle refrigerants?
A. Clean Air Act Section 612
B. OSHA Standard 1910.1200
C. EPA Section 609
D. DOT 49 CFR
C. EPA Section 609
EPA Section 609 requires technicians to be certified to purchase or
handle refrigerants used in motor vehicle air conditioning systems.
6. An EATC air conditioning system has low fan speed operation during
high-demand situations, like in direct sunlight. Technician A says this is
because debris and loose papers on the dashboard are blocking the sun
load sensor's photodiode. Technician B says to test the sun load sensor
with an ohmmeter. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
, D. Neither A nor B
C. Both A and B
The sun load sensor is a photosensitive diode placed on the dash that
changes resistance according to its exposure to sunlight. Debris can
block it, and testing with an ohmmeter is a valid diagnostic step.
7. There's a gurgling sound inside a vehicle's dashboard. Technician A says
an air pocket in the heater core could be the cause. Technician B says this
could be the result of a leaking head gasket. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
C. Both A and B
A gurgling sound occurs when air enters the heater core. This condition
can also be caused by a blown head gasket forcing compression into
the engine's cooling system.
8. A manifold gauge indicates a system has low discharge pressure. The
MOST likely cause of this condition is:
A. A restricted condenser
B. A loose fan belt
C. A damaged compressor reed valve
D. A broken compressor piston
C. A damaged compressor reed valve
Damaged reed valves or plates result in low discharge pressure. A
restricted condenser or loose fan belt would cause high high-side
pressure.
9. The compressor rapidly cycles on and off on a CCOT air conditioning
system. Technician A says this condition can be caused by a low
refrigerant charge. Technician B says this could be caused by a faulty
clutch cycling switch. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
