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Topic: A/C blowing out of defrost and heater vents

in Forum: C4 Interior


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A/C blowing out of defrost and heater vents (1/4)
 6/22/17 7:47pm
vettish95
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Santee, CA - USA

Vette(s):
1996 Coupe. I have owned a 1979, a 1987 convertible, and a 1995 coupe


Joined: 5/14/2017
Posts: 1

Hi folks.
I am told that the a/c programing module could be bad causing the air to blow out of the wrong vents.  Any ideas of anything else it could be.  Blows cold just not out of the dash vents
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Re: A/C blowing out of defrost and heater vents (2/4)
 6/23/17 4:21pm
Black Shark
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Vette(s):
Black 1979 L-82 Black 1996 LT1 Black 1999 Coupe


Joined: 3/20/2009
Posts: 611

did you check the vent doors for vacuum leaks?
also check for a broken vacuum line at the vent doors or at selector switch/plate
Re: A/C blowing out of defrost and heater vents (3/4)
 6/25/17 12:00pm
russ1953
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Sebring, FL - USA

Vette(s):
1987 Red Roadster Automatic (SOLD 4/4/23) it will be missed. 2004 Yellow Coupe 6 speed 2014 Red Convertible Z51 3LT


Joined: 7/16/2016
Posts: 18

I would check for vacuum leaks first. my 87 had a broken vacuum line below the distributor. fixed that and then the heat/AC doors would work as they should, also the cruise control then worked fine.
Re: A/C blowing out of defrost and heater vents (4/4)
 6/28/17 2:59pm
Busterbrown
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Sonomma, CA - USA

Vette(s):
1995 coupe DRM


Joined: 11/4/2013
Posts: 14

If the 95 or 96 is the problem, remove the pass/side rail cover & check the valve.
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