Exam 55: Air-Conditioning Diagnosis and Service

During a performance test, both the low-side and high-side pressures are above normal. Which of the following could cause this problem?

A single drop of water in an A/C refrigeration system may cause damage to the system.

How can you identify the type of refrigerant used in an A/C system?

Frost on the outside of the receiver/dryer, but not on the liquid line between the condenser and receiver/dryer indicates ______.

Bubbles in the sight glass of an R12 system indicate _____.

Which of the following statements best defines the term "evacuation"?

Which of the following is recommended while converting an R-12 system to R-134a?

R-12 to R-134a conversions are being discussed. Technician A says the original receiver/dryer or accumulator should not be replaced. Technician B says permanently install conversion fittings using a thread-locking chemical. Who is correct?

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

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

A manifold gauge set is used to determine both high-side and low-side pressures in the refrigeration system.

The high-voltage electrical system of a hybrid vehicle should be shut down and isolated from the vehicle prior to working on the A/C compressor.

Technician A says the cabin air filter should be replaced every 12,000 to 15,000 miles (19,300 to 24,140 km) or once a year. Technician B says some cabin air filters have a charcoal layer for odor absorption. Who is correct?

Technician A says air in the system can cause excessive pressure within the A/C system. Technician B says moisture can cause freeze-up at the expansion valve. Who is correct?

A compressor clutch that chatters when the A/C is off could be caused by _____.

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

What may result if there is too little or too much oil in an A/C system?

Technician A says the sight glass is located in the suction line, between the accumulator and compressor. Technician B says the sight glass is located on the receiver/dryer. Who is correct?

The A/C compressors on hybrid vehicles have _____colored wires and wire harness covers to indicate they carry high voltage.

How are manifold gauge service hoses colored?