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AC only blows on low

Tiny
DUKE2991
  • MEMBER
  • 1996 CADILLAC DEVILLE
  • 150,000 MILES
Ac blows on low just fine but when I turn it up it will blow for a second then either cut back to low or wont blow at all. Usually works ok at nigh tand sometimes after the car has been running for a while.
Monday, May 28th, 2012 AT 8:16 PM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It is an automatic system and the blower control is in the programmer. Get a shop with a scan tool to check the system for you to verify a programmer failure.

Roy
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Monday, May 28th, 2012 AT 9:01 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
This car uses an electronic blower speed controller which, in this case is built into the blower. The programmer sends the signal to it but the blower is a much more common failure.
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Monday, May 28th, 2012 AT 9:54 PM

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