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Diagnosing Air Conditioning Systems




1.Which of the following is true of a sight glass on a retrofit?
The sight glass is a reliable indicator of R134a charge.
The sight glass was designed for use with R134a refrigerant.
The sight glass was designed for use with R12 refrigerant.
Both a and b.


2.When may coolant be present on spark plug tips?
When the engine has not been run for a while.
After the engine runs continuously for several hours.
When the engine overheats.
Anytime, regardless of engine use.


3.The compressor head and lines become very cold during normal refrigerant system operation.
True.
False.


4.Refrigerant dye can hamper heat transfer.
True.
False.


5.Which hand valve should not be opened when the air conditioning is running?
Low side.
High side.
Both a and b.
Neither a nor b.

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