2. A vehicle blows warm air only
when the heater is on high output.
Technician A says this could be a
restricted heater control valve.
Technician B says this could be
caused by a low coolant level.
Who is correct?
when the heater is on high output.
Technician A says this could be a
restricted heater control valve.
Technician B says this could be
caused by a low coolant level.
Who is correct?
3. Two technicians are discussing
heat transfer in an automotive A/C
system. Technician A says as
refrigerant converts from a gas to a
liquid it receives heat. Technician B
says an expansion valve drops the
pressure from the liquid line before
it enters the evaporator. Who is
correct?
heat transfer in an automotive A/C
system. Technician A says as
refrigerant converts from a gas to a
liquid it receives heat. Technician B
says an expansion valve drops the
pressure from the liquid line before
it enters the evaporator. Who is
correct?
4. Technician A says a open A/C
relay winding can prevent A/C
clutch engagement. Technician B
says a loose serpentine belt can
prevent clutch engagement.
Who is correct?
relay winding can prevent A/C
clutch engagement. Technician B
says a loose serpentine belt can
prevent clutch engagement.
Who is correct?
5. Technician A says evacuating an
A/C system will remove moisture
and humidity. Technician B says to
evacuate the system any time it's
been opened to the atmosphere.
Who is correct?
A/C system will remove moisture
and humidity. Technician B says to
evacuate the system any time it's
been opened to the atmosphere.
Who is correct?
6. Technician A says oil residue on
an A/C hose may indicate a leak in
the system. Technician B says its
not necessary to replace the small
amount of oil lost in the leak.
Who is correct?
an A/C hose may indicate a leak in
the system. Technician B says its
not necessary to replace the small
amount of oil lost in the leak.
Who is correct?
7. Technician A says mineral oil is
used to lubricate 134a A/C systems.
Technician B says A/C oil mixes with
the refrigerant to lubricate the
compressor, seals, o-rings etc. in
the A/C system. Who is correct?
used to lubricate 134a A/C systems.
Technician B says A/C oil mixes with
the refrigerant to lubricate the
compressor, seals, o-rings etc. in
the A/C system. Who is correct?
8. A vehicle has a High - High Side
pressure. All of these can cause
this condition except:
pressure. All of these can cause
this condition except:
9. Technician A says a frozen point
on an A/C component or connection
indicates a restriction in the
system. Technician B says a frozen
expansion valve will cause a Low -
Low side pressure. Who is correct?
on an A/C component or connection
indicates a restriction in the
system. Technician B says a frozen
expansion valve will cause a Low -
Low side pressure. Who is correct?
10. Two technicians are
discussing the cycling clutch
system. Technician A says the
temperature cycling clutch switch
uses a bulb placed on the inlet port
of the evaporator core. Technician
B says a typical pressure cycling
switch is located on the
accumulator or the low side of a
system. Who is Correct?
discussing the cycling clutch
system. Technician A says the
temperature cycling clutch switch
uses a bulb placed on the inlet port
of the evaporator core. Technician
B says a typical pressure cycling
switch is located on the
accumulator or the low side of a
system. Who is Correct?
| Free A.S.E. Study Guide An ASE Study Guide for the Automotive Technician |
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1. A technician installs a set of A/C
gauges on a vehicle with poor A/C
performance. The High side is Low
and the Low side is High. This
indicates a:
gauges on a vehicle with poor A/C
performance. The High side is Low
and the Low side is High. This
indicates a:
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| A-7 Heating and Air Conditioning Practice Test |
