1997 Cadillac Deville A/C compressor coming on while heater

Tiny
ETHANHAWK_2008
  • MEMBER
  • 1997 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 116,000 MILES
The a/c compressor cycles when I have the heater on. I t does not cycle when the desired temp is low. Does the high side thermistor have anything to do with cooling fan operation?
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Sunday, January 10th, 2010 AT 10:57 PM

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Tiny
FACTORYJACK
  • EXPERT
It should not cycle at all when ambient temp is below 40F. It will cycle when in defrost, and/or when in 'auto' and the temp is above 40. The high side temp sensor does have some affect on cooling fan operation. Higher than normal high side temp may indicate reduced airflow across the condenser, say when idling in traffic and the weather is warm. They would come on high in an effort to increase flow across the condenser.
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Sunday, January 10th, 2010 AT 11:51 PM

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