ASE A7 Exam: Questions & Answers (Heating Air Conditioning): ASE A7 Heating Air Conditioning: Guaranteed APlus Guide

The compressor is rapidly cycling on and off on a CCOT 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 technicians are correct. 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 is correct. The two refrigerants cannot be mixed. A separate, dedicated R-12 refrigerant container is used. Each refrigerant has its own color assignment. R-12's assignment is white and R-134a is sky blue "light blue". 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 is correct. The automatic temperature control module uses several input sensors. The ambient or outside air temperature sensor is a variable resister. If the outside temperature is colder than