Exam 55: Heating and Air Conditioning Diagnosis and Service

The filling level of a refrigerant container should never exceed _____ percent of the container's gross weight rating.

Large amounts of black dust around the clutch plate are an indication of a _____.

____________________ testing provides a measure of an air-conditioning system's operating efficiency.

Some cabin air filter elements are impregnated with baking soda and a filter with a biocidal cartridge to prevent the growth of bacteria, mold, mildew, etc.

Compressor clutch plate to pressure plate clearance is measured with a ____________________ .

Normally the A/C system is charged on the _____ with the engine running.

EPA certification is required to service R-12 A/C systems.

Refrigerant exposed to an open flame will produce a(n)____________________ gas.

If refrigerant comes into contact with your eyes or skin, it may cause ____________________.

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

Identify the connection points for the three hoses on a manifold gauge set and the colors of the hoses.

What are the four types of air-conditioning system problems?

A/C parts replacement is being discussed. Technician A says if the system has been open for more than two minutes, the entire system must be completely evacuated and a new accumulator must be installed. Technician B says if the compressor has internal damage the condenser may need to be flushed and the receiver/dryer or accumulator replaced. Who is correct?

Separate service equipment must be used for different refrigerants.

All recovery/recycling equipment must have shutoff valves within ____________________ inches of the hoses' service ends.

In hot and humid weather, normal evaporator air outlet temperature can be as high as ____________________ °F .

A loud squealing noise could be caused by ______.

R-12 is stored in light blue containers.

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

Before recovering refrigerant, the refrigerant must be _____.