1996 Cadillac Deville

Tiny
WHITETIGER_1272
  • MEMBER
  • 1996 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 160,000 MILES
My heater works but when I push the defroster it switches to vent what do I do to fix this/
Monday, December 15th, 2008 AT 4:15 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi:
There are vent doors in the HVAC duct work that are actuated by vacuum. You will need to check for a vacuum leak at the switch or see if you can hear a hiss coming from anywhere under the dash.

Let me know what you find.
Joe
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Thursday, December 18th, 2008 AT 9:56 PM

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