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?
A. Technician A B. Technician B C. Both Technician A and B D. Neither Technician A or B
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?
A. Technician A B. Technician B C. Both Technician A and B D. Neither Technician A or B
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?
A. Technician A B. Technician B C. Both Technician A and B D. Neither Technician A or B
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. Technician A B. Technician B C. Both Technician A and B D. Neither Technician A or B
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?
A. Technician A B. Technician B C. Both Technician A and B D. Neither Technician A or B
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?
A. Technician A B. Technician B C. Both Technician A and B D. Neither Technician A or B
8. A vehicle has a High - High Side pressure. All of these can cause this condition except:
A. Restricted condenser B. No fan operation C. Overtightened A/C belt D. Overcharged system
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?
A. Technician A B. Technician B C. Both Technician A and B D. Neither Technician A or B
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?
A. Technician A B. Technician B C. Both Technician A and B D. Neither Technician A or B
Free A.S.E. Study Guide An ASE Study Guide for the Automotive Technician