ASE A/C Exam Practice Questions and Answers

ASE A/C Exam Practice Questions and Answers An 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? - Ans:-Both A and B 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 a blown head gasket. Who is correct? - Ans:-Both A and B A manifold gauge indicates a system has low discharge pressure. The MOST likely cause of this condition is: - Ans:-A damaged compressor reed valve. The compressor is rapidly cycling on and off on a CCOT (cycling clutch orifice tube) 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 clutch cycling switch. Who is correct? - Ans:-Both A and B ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 2/11 Technician A says while performing a retrofit from R-12 refrigerant to R134a refrigerant, the refrigerant must be recovered into a dedicated cylinder, they cannot be mixed. Technician B says R-12 refrigerant functions at higher pressures than R-134a refrigerant does. Who is correct? - Ans:-Tech A Technician 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? - Ans:-Tech B During an initial inspection, the technician notices that one line on the receiver drier is cooler than the other. This is caused by: - Ans:-A restriction in the receiver drier. During a performance test on a CCOT system the manifold gauge indicates that the high side pressure is low and the low side pressure is high. This is caused by a: - Ans:-Faulty compressor An air conditioning system blows only warm air when the heater is on high output. Technician A says this could be a faulty heater control valve. Technician B says this could be caused by the cooling system's thermostat. Who is correct? - Ans:-Both A and B Technician 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? - Ans:-B Only (A fixed orifice tube provides a consistent output, based upon the size of its orifice. It's a compromise between idle and highway conditions) ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 3/11 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 evaporator. Who is correct? - Ans:-Both A and B During a visual inspection an oily spot is found on a hose leading from the compressor. Technician A says there may be a refrigerant leak in the system. Technician B says today's R134a systems use mineral oil instead of the older R12 compatible PAG oil. Who is correct? - Ans:-Tech A Only An air conditioning system contains a thermostatic expansion valve. The suction line leading to the compressor is cool to the touch. This indicates: - Ans:-Normal Condition All of these are true about an accumulator EXCEPT: - Ans:-This system contains a thermostatic expansion valve to meter the refrigerant. A vehicle has poor air conditioning performance. The customer has added R134a refrigerant to the system. Technician A says to use a refrigerant identifier. Technician B says refrigerant mixtures are not recommended, but will not affect system pressures. Who is correct? - Ans:-Tech A Only Two technicians are discussing a CCOT air conditioning system. Technician A says the system's pressure cycling clutch switch contains a bulb placed on the inlet port of the evaporator core. Technician B says a pressure cycling switch is located on the low side of the system. Who is correct? - Ans:-Tech B Only All these statements are true about a throttle position sensor EXCEPT: - Ans:-The ECM disengages