Exam 55: Air-Conditioning Diagnosis and Service

Describe the purpose of the evacuation process.

R-12 and R-134a _____.

A manifold gauge set can be used during A/C system diagnosis.

The blower motor on a vehicle does not run when the fan switch is in the low and medium position. It works properly when it is in the high position. Technician A says the problem is in the resistor block. Technician B says the problem is in the blower motor. Who is correct?

During the recharging procedure: if the ____________________ hand valve is opened with the system operating, the refrigerant container could explode!

Technician A says refrigerant hoses can be repaired. Technician B says damaged refrigerant hoses cannot be repaired and must be replaced. Who is correct?

Unpleasant odors coming from the A/C system can be eliminated by ______.

When installing an A/C system filter: if the filter does not have an orifice tube, it should be installed in the _____ line.

Which of the following statements is NOT true about orifice tube systems?

A loud squealing noise could be caused by ______.

A problem with the HVAC mode control linkage, doors, or motor circuit cannot set a DTC.

Moisture mixed with R-12 produces ____________________ acid.

What is the function of the low-pressure cutoff switch?

Why must the work area be well ventilated when working on refrigeration systems?

A loss of ____________________ ounces of R-134a refrigerant per year is acceptable.

When evacuating an A/C system, the vacuum pump should remain on and connected to the system for at least thirty minutes after _____ inches of mercury (in. Hg) is reached.

When replacing a typical A/C system component, the system must be discharged _____.

Schrader valves closely resemble ____________________ valves.

Why is it important to keep the manifold gauge set high-side hand valve closed while the system is running?

Warm underhood temperatures produce lower than normal A/C system pressures.