Exam 55: Air-Conditioning Diagnosis and Service

Technician A says there should be a gradual change from hot to warm as you move your hand along the return bends of the condenser from the bottom to the top. Technician B says a restriction in the condenser will be evident by a sudden change in temperature. Who is correct?

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

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

Technician A says the oil level of the compressor should be checked every year. Technician B says the system should be charged only after it has been completely evacuated. Who is correct?

The manifold gauge set has an inches-of-mercury [vacuum] scale on the _____ gauge.

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

In some states and provinces, you must be certified by an EPA-approved program to buy refrigerant.