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- 1. Multiple ChoiceA vehicle's air conditioning performance is reduced at low speeds and stop lights, but cools at highway speeds. Which of these is MOST likely the cause of this condition?A low refriderant charge.
A defective radiator cooling fan.
A normal condition.A faulty compressore clutch relay. - 2. Multiple Choice
A frozen spot is noticed in the center of the condenser. Technician A says a frozen spot on a component or connection indicates a restriction in the system. Technician B says this is caused Too much freon. Who is correct?
Technician A only
Technician B only
Both Technician A and B
Neither Technician A nor B
- 3. Multiple ChoiceA technician is diagnosing a vehicle's air conditioning system. The vehicle has good engine performance, but the air conditioner is blowing warm air only. A yellow substance is noticed around the evaporator case drip tube. Technician A says this is coolant leaking from the heater core. Technician B says this is fluorescent dye leaking from the evaporator core. Which technician is MOST likely correct?Technician A onlyTechnician B onlyBoth Technician A and BNeither Technician A nor B
- 4. Multiple ChoiceTwo technicians are discussing electric cooling fans and air conditioning performance. Technician A says electric fans regulate refrigerant temperatures more precisely than belt driven fans do. Technician B says electric cooling fans are controlled by control modules that use temperature and pressure actuated sensors and switches. Who is correct?Technician A onlyTechnician B onlyBoth Technician A and BNeither Technician A nor B
- 5. Multiple ChoiceTechnician A says the clutch relay protects the control head from the clutch circuit's high current. Technician B says open clutch relay windings result in compressor clutch engagement at all times. Who is correct?Technician A onlyTechnician B onlyBoth Technician A and BNeither Technician A nor B
- 6. Multiple ChoiceAll of these are true about an air conditioner's evaporator EXCEPT:It removes humidity from the air.Refrigerant flows from the bottom to the top.Refrigerant enters the evaporator as a liquid.The refrigerant changes from a vapor to a liquid as it receives heat from the cabin air.
- 7. Multiple ChoiceA blower motor operates only in high speed. Technician A says there could be a short in the motor's power feed. Technician B says it may have a faulty blower motor resistor. Who is correct?Technician A onlyTechnician B onlyBoth Technician A and BNeither Technician A nor B
- 8. Multiple ChoiceA compressor clutch coil is being tested. There is 12 volts at the connector and the ground is good. The resistance of the coil is 0.00 Ohms. Technician A says the coil has an open in it's windings. Technician B says the clutch coil has a short and has failed the resistance test. Who is correct?Technician A onlyTechnician B onlyBoth Technician A and BNeither Technician A nor B
- 9. Multiple ChoiceThe carpet is wet on the passenger's side of a vehicle. Technician A says this may be caused by a leaking heater core. Technician B says this could be caused by a clogged evaporator case drain tube. Who is correct?Technician A onlyTechnician B onlyBoth Technician A and BNeither Technician A nor B
- 10. Multiple ChoiceAn EATC air conditioning system has low fan speed operation during high demand situations, like in direct sunlight. Technician A says this is because something is covering the sun load sensor's photo diode. Technician B says a sun load sensor is a variable resistor and can be tested with an ohmmeter. Who is correct?Technician A onlyTechnician B onlyBoth Technician A and BNeither Technician A nor B
- 11. Multiple Choice
A gurgling sound is heard coming from inside the dashboard of a vehicle. Technician A says this is air trapped in the heater core. Technician B says this noise can be caused by low coolant. Who is correct?
Technician A onlyTechnician B onlyBoth Technician A and BNeither Technician A nor B - 12. Multiple Choice
The compressor is rapidly cycling on and off on a 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 high pressure cycling switch. Who is correct?
Technician A only
Technician B only
Both Technician A and B
Neither Technician A nor B
- 13. Multiple ChoiceTechnician A says an ambient temperature sensor senses cabin air temperature. Technician B says a faulty ambient temperature sensor can prevent compressor clutch engagement. Who is correct?Technician A onlyTechnician B onlyBoth Technician A and BNeither Technician A nor B
- 14. Multiple ChoiceDuring an initial inspection, the technician notices that one line on the receiver drier is cooler than the other. This is caused by:Nothing, its a normal condition.A low refrigerant charge.Too much oil in the system.A restriction in the receiver drier.
- 15. Multiple Choice
During a performance test on a AC system the manifold test gauges indicate that the high side pressure is low and the low side pressure is high, they both are equal pressure. This is caused by a:
Stuck open expansion valve.
Frozen expansion valve.
Restricted condenser.
Faulty compressor.
- 16. Multiple Choice
A heating system blows only partially warm air when the heater is on high output. Technician A says this could be a restriction in the heater core. Technician B says this could be caused by the cooling system's thermostat. Who is correct?
Technician A only
Technician B only
Both Technician A and B
Neither Technician A nor B
- 17. Multiple ChoiceTechnician A says a fixed orifice tube varies the flow of refrigerant in relation to temperature. Technician B says a fixed orifice tube is located between the condenser and the evaporator. Who is correct?Technician A onlyTechnician B onlyBoth Technician A and BNeither Technician A nor B
- 18. Multiple Choice
Technician A says the expansion valve is located on the inlet port of the evaporator. Technician B says the expansion valve's temperature sensing bulb is located near the outlet port of the condenser. Who is correct?
Technician A onlyTechnician B onlyBoth Technician A and BNeither Technician A nor B - 19. Multiple ChoiceAn air conditioning system contains a thermostatic expansion valve. The suction line leading to the compressor is cool to the touch. This indicates:A stuck open expansion valve.A low refrigerant charge.A stuck closed expansion valve.A normal condition.
- 20. Multiple ChoiceAll of these are true about an accumulator EXCEPT:It is located on the low side of the system.It prevents excess liquid from entering the compressor.It contains a desiccant capable of absorbing moisture from the refrigerant.This system contains a thermostatic expansion valve to meter the refrigerant.
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