Exam 55: Air-Conditioning Diagnosis and Service

Some late model air-conditioning systems have a(n) ____________________ capability that can be helpful when troubleshooting problems.

A manifold gauge set can be used during the evacuation of the A/C system.

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

In an R-12 to R-134a conversion, a high-pressure cutoff switch should be installed if the system does not have one.

R-12 systems use ____________________based oils.

The owner of a car complains of a whistle or hiss only after the engine is shut down and only when the air-conditioning has been running. Technician A says there is a broken or leaking vacuum hose inside the dash. Technician B says this is a normal noise caused by the pressure of the refrigerant equalizing after the engine is turned off. Who is correct?

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

Which of the following cannot cause excessive heat?

All new vehicles sold in the United States must have a cabin air filter or a slot where one can be installed.

Upon reaching a 26 to 29 in. Hg vacuum reading, the vacuum pump should remain on and connected to the system for at least ____________________ minutes while evacuating an A/C system.

EPA certification is required to _____.

When an orifice tube A/C system has remained open for any length of time, the ____________________ should be replaced.

What should always be done before disconnecting a refrigerant connection?

Technician A says if the suction line to the compressor is covered with thick frost, this might indicate that the expansion valve is flooding the evaporator. Technician B says the formation of frost on the outside of a line or component means there is a restriction to the flow of refrigerant. Who is correct?

The presence of oil on or around the compressor clutch normally indicates a bad ____________________

R-134a is stored in yellow containers.

The leak-test dye in an A/C system will appear luminous yellow-green when illuminated by a(n) _____ light.

A complaint concerning water on the front floor carpeting even in dry weather could be caused by _____

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

R-12 is stored in light blue containers.