1999 Cadillac Deville display says "service AC system&

Tiny
BRJR14
  • MEMBER
  • 1999 CADILLAC DEVILLE
  • V8
  • 2WD
  • AUTOMATIC
  • 124,000 MILES
The display says "service AC system. I checked the owners manual and it said " sensors that control the AC/heat system needs service. I tried to put freon in the compressor and I cannot keep the auto on so the Ac works, its goes back "econ", therefore I cant get the freon to take. What sensors are needing to be replaced and where are they located.
Thursday, March 25th, 2010 AT 5:41 PM

1 Reply

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
If it is seeing low refrigerant, it will default to econ for compressor protection. To do this correctly, You should have the system diagnosed/recovered to determine the state of charge. It could be one of two things, it is actually low on refrigerant or, it has a faulty pressure/temp sensor falsely reporting a low refrigerant charge. The same low refrigerant code could set in either case.
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Friday, March 26th, 2010 AT 12:14 AM

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