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Jim Grant's Tech Tips
87
Chrysler New Yorker, A/C Diagnosis
Q: What actually controls
the air conditioner to cycle on and off on an '88 Chrysler New Yorker
with the climate control heating and cooling system? How would you diagnose
a problem with this system when the compressor is not cycling, assuming
there is adequate freon and proper voltage going through the compressor
and pressure switch?
A: You
cannot assume that there is an adequate charge of refrigerant in the A/C
system. Virtually every manufacturer's A/C system will shut down the A/C
compressor if the system pressure drops below a specified pressure. The
reason for this is to prevent damage to the A/C compressor and system,
in the event there is a system leak. If a failed A/C system is allowed
to continue operating, the lubricating oil will be forced out and contaminants
would be allowed to enter the system at a much greater rate. The result
would be catastrophic to the checking account. The first step in diagnosing
an inoperative A/C system is to verify that there is adequate refrigerant
in the system. From that point, diagnosis would turn to the electrical
circuits that are responsible for activating the system. Diagnosis and
repair of A/C systems requires specialized equipment, training and the
technician handling the refrigerant must be federally licensed. Have your
A/C system diagnosed, from that point you can determine if the repairs
are something you can handle.
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