ASE HVAC exam practice Questions And Answers Rated 100% Correct!!

What would be the most likely result of a missing AC compressor clutch diode? - Answer-Damage to the ECM Tech A says that the service fittings for R-134a are the same as the service fittings for R-12. Tech B says the low-side service fitting is a 16mm quick-connect and high-side is 13mm quick-connect. Who is right? - Answer-Neither An inoperative cable-controlled heater control valve is being diagnosed. The control moves freely, but the valve does not respond. Tech A says the cable housing clamp may be loose at the panel end. Tech B says the cable may be rusted in the housing. Who is right? - Answer-A only Tech A says that the scan tool receives data from the vehicle by communicating on the data bus network. Tech B says that if one of the two data bus wires becomes broken, then the network still communicates on the remaining good wire but will set a trouble code. Who is right? - Answer-Both The tool in the figure above is used to remove and install which AC component? - Answer-The Orifice tube Referring to the figure above, the blend door gets jammed in the middle of the travel area. What is the most likely system fault? - Answer-The HVAC air temp could not be regulated. Which AC related procedure would the above tool be used for? - Answer-Testing the refrigerant for impurities. Referring to the figure above, what would the HVAC malfunction if the component became restricted? - Answer-Low airflow from the ducts. Referring to the figure above, the AC compressor clutch will not engage. Tech A says that the AC clutch relay could be bypassed with a fused jumper to test the load side of the circuit. Tech B says that fuse 17 sends power to the AC compressor clutch relay. Who is right? - Answer-A only A hissing noise is heard in the engine compartment for approximately one minute after the engine is shut off. Tech A says that the AC system equalization makes a noise. Tech B says the heater core makes a noise. Who is right? - Answer-A onlyThe vacuum check valve was missing from the circuit but the remaining hoses are still connected. Tech A says that the modes would be stuck in the heat mode and not move. Tech B says that mode actuators would work normal until the vehicle drove up steep hills. Who is right? - Answer-B only A performance test is being performed on a late-model vehicle. Tech A says that a thermometer should be placed in the center duct during the test. Tech B says the AC refrigerant should be recovered during the test. Who is right? - Answer-A only