1991 Cadillac Brougham airconditioning not functioning properly

Tiny
DEB333
  • MEMBER
  • 1991 CADILLAC BROUGHAM
  • V8
  • RWD
  • AUTOMATIC
  • 64,000 MILES
Had not been driven in a few years. The compressor was not working, but could get the heating/defrost to work while in ecno mode. Replaced the compressor, filled refrigerant, start car press auto set temp @65 blows out air until you start driving then only blows air out at your feet, doesn't feel cold but is cool. Can hear the compressor cycling on and off and is making a humming noise. Also after you stop the car and place in park the air again blows out of the front vents. Do you know why this is doing that. If you switch it to econo only get outside air that blows thru vents?
Monday, August 4th, 2014 AT 4:30 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
The vent doors that direct the air flow are actuated by engine vacuum. It sounds like you have a vacuum leak causing the vacuum supply to be lowered. As a result, the vent doors can't maintain position and the air flow changes.
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Monday, August 4th, 2014 AT 7:31 PM

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