ASE A7 Heating Air Conditioning Practice Test

46. There is little air flow through the vents of a vehicle's automatic air conditioning system. Which of these is the cause?

  • A. An open in the blower motor circuit.
  • B. Resistance in the blend door motor circuit.
  • C. A faulty compressor.
  • D. A clogged cabin air filter.

46.

Answer A is wrong. An open in the blower motor circuit would prevent airflow.

Answer B is wrong. Resistance in the blend door circuit would affect cabin air temperature.

Answer C is wrong. A faulty compressor affects air temperature.

Answer D is correct. Cabin air filters get clogged with debris, restricting airflow as the system attempts to draw in the fresh air. If the fan is set on high and there's little airflow through the vents, suspect a clogged cabin air filter.

47. An air conditioning system contains a thermostatic expansion valve. The suction line leading to the compressor is cool to the touch. This indicates:

  • A. A stuck open thermostaic expansion valve.
  • B. A low refrigerant charge.
  • C. A stuck closed thermostaic expansion valve.
  • D. A normal condition.

47.

Answer A is wrong. A stuck open expansion valve will freeze the suction line and may damage the compressor.

Answer B is wrong. A low refrigerant charge would leave the line warm to the touch.

Answer C is wrong. A stuck closed expansion valve would leave the line warm to the touch and may draw the system into a vacuum.

Answer D is correct. This is a normal condition.

48. All of these are true about an accumulator EXCEPT:

  • A. It is located on the low side of the system.
  • B. It prevents excess liquid from entering the compressor.
  • C. It contains a desiccant capable of absorbing moisture from the refrigerant.
  • D. This system contains a thermostatic expansion valve to meter the refrigerant.

48.

Answer A is wrong. The accumulator is located on the low side of the system.

Answer B is wrong. It prevents excess liquid from entering the compressor.

Answer C is wrong. It contains a desiccant designed to absorb any moisture in the system.

Answer D is correct. An accumulator is used on a CCOT or Cycling Clutch Orifice Tube type system.

49. There is a clicking sound heard when the temperature setting on the air conditioning control panel is changed. Technician A says a faulty door actuator will cause this clicking sound. Technician B says the actuator may need calibration after replacement. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

49.

Answer A is wrong. Both technicians are correct.

Answer B is wrong. Both technicians are correct.

Answer C is correct. Mode door actuators will make a clicking sound as they wear and become faulty. Most of these actuators require a calibration procedure after replacement.

Answer D is wrong. Both technicians are correct.

50. Technician A says evacuating an air conditioning system will remove air, debris, and moisture. Technician B says to evacuate the system any time it's been exposed to the atmosphere. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

50.

Answer A is wrong. Evacuating a system will remove moisture. Flushing the system will remove debris and metal.

Answer B is correct. Always evacuate the system if it's been exposed to the atmosphere.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

ASE A7 Heating Air Conditioning Quiz
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