ASE automotive Air-Con Exam Questions And Answers 100% Pass
1 view 0 purchase
Course
ASE
Institution
ASE
ASE automotive Air-Con Exam Questions
And Answers 100% Pass
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. Technici...
ASE automotive Air-Con Exam Questions
And Answers 100% Pass
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 Tech A and B D. Neither
Tech A or B - answer✔1. The correct answer is A. Evacuating an A/C system removes air and
moisture from the system. The receiver/drier may contain a filter or strainer to catch and trap
foreign particles and dirt, but this remains in the receiver/drier and is not removed during the
evacuation procedure.
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 a Both A and B D.
Neither A or B - answer✔2. The correct answer is B. The compressor clutch bearing allows the
rotor slash pulley assembly to spin independently of the compressor shaft when the A/C system
is off. When the engine is running and the A/C system is off (the compressor clutch bearing is
spinning. When the A/C system is turned on) the rotor/pulley assembly and the armature are
locked together by the magnetic action of the compressor clutch coil.
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 G. a restriction in the high side D. damaged compressor - answer✔3. The
correct answer is B. Low pressure on both the low side and the high side indicates a low
refrigerant charge.
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 refrigerant source C. the filter can be changed without disconnecting the hoses D.
refrigerant discharge can be kept to a minimum - answer✔4. The correct answer is D. According
to the Clean Air Act, recovery/recycling equipment must have shutoff valves located within 12-
in. (30 cm) of the hoses' service ends so that refrigerant discharge to the atmosphere can be
kept to a minimum.
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✔5. The correct answer
is B. The technician should wait five minutes and watch the gauges to see if there is any residual
pressure. If there is, repeat the process to remove any remaining refrigerant until the A/C
system holds a stable vacuum for at least five minutes.
6. A system with a low pressure on the low side and a 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✔6. The correct answer
is D. A low pressure reading on the low side and a heavy frost accumulation on the inlet side of
the TXV indicates a clogged screen at the expansion valve inlet or a TXV stuck closed.
7. A blower motor only works on high speed. Which of the 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✔7. The correct answer is B. Answer D is incorrect because if
the blower fuse was blown or circuit breaker tripped, the blower would not work at all. Answer
A is incorrect because a blower relay is generally only used for the high blower speed and this is
working. Answer C, the blower switch is a possible cause but the most likely cause for operation
on only high speed is that a portion of the resistor assembly is burned out.
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✔8.
The correct answer is C. If, during hard acceleration, air routing changes by itself, it's probably
due to a leak in the system or a faulty check valve in the vacuum reservoir. A complaint that the
mode shifts from the dash to the floor at wide-open throttle is evidence that the system isn't
holding vacuum.
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✔9. The correct answer is A. If the
engine is started while pressure testing a cooling system and the pressure immediately
increases, there could be a head gasket leak, but not into the crankcase. The coolant may be
going out the tailpipe, but since this is a late model gasoline engine vehicle and equipped with a
catalytic converter, there is no white smoke from the exhaust because the converter super-
heats the coolant into such a fine vapor that it is not noticeable.
10. When identifying an A/C system, Technician A says that an accumulator located between
the evaporator and compressor is an indication that the system has an orifice tube. Technician
B says that when the high-side service port fitting is smaller than the one on the low side, the
system uses R134a refrigerant. Who is right? A. Technician A only B. Technician B only C. Both A
and B D. Neither A or B - answer✔10. The correct answer is A. Systems using an expansion valve
have a receiver/drier between the valve and condenser, while orifice tube systems have an
accumulator between the evaporator and compressor. Technician B is wrong because on R134a
systems, the low-side service port is the smaller one.
11. When troubleshooting an ATC system, the system responds when the ambient and in-
vehicle temperature sensors are heated and cooled. However, there is no response when the
sunload sensor is exposed to a light source. Technician A says that the problem is with the
system's programmer. Technician B says that the problem is with the sunload sensor. Who is
right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B - answer✔11.
The correct answer is B. If the system reacts with a change to one or two inputs but not to the
third, the problem is most likely confined to the single sensor or its circuit. But if no reaction is
observed on any of the units, or only a partial reaction is seen, the problem is usually with the
programmer.
12. The following are all methods of orifice tube re-placement EXCEPT: A. Replace the line that
incorporates the orifice tube. B. Disconnect the liquid line from the evaporator inlet line and
pull the orifice tube straight out with an extractor tool. C. Disconnect the liquid line from the
evaporator inlet line and, using a twisting motion to break free of the line, pull out the orifice
tube with an extractor tool. D. Cut out the section of line containing the orifice tube and, using
a kit, install a new orifice tube line segment. - answer✔12. The correct answer is C. When
removing the orifice tube with an extractor tool, do not twist or rotate the orifice tube in the
line as it can break. If an orifice tube breaks during removal, special tools are available to
extract broken orifice tubes. All of the other answers are methods of orifice tube replacement.
13. Technician A say when there is a "U" DTC, it should be repaired before any further
diagnostics can be performed. Technician B says "U" DTCs indicate there is nothing wrong with
the AC system. Who is correct? A. Technician A only B. Technician B only C. Both Technician A
and B D. Neither Technician A or B - answer✔13. The correct answer is A. A "U" DTC indicates
there is a problem with the present modules not being able to communicate with each other. It
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Thebright. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
