1999 Cadillac Deville display says "service AC system&

1999 CADILLAC DEVILLE
124,000 MILES • V8 • 2WD • AUTOMATIC
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BRJR14
  • MEMBER
  • 1 POST
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.
Mar 25, 2010 at 5:41 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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FACTORYJACK
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 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.
Mar 26, 2010 at 12:14 AM
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