heater only blowing on winshield - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-05-2005, 10:50 PM   #1
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Default heater only blowing on winshield

it works but no matter what i set the dial to it always blows to the winshield not the floor, or mid level. any ideas

and my ongoing leaking now i can ice skate on my back floor
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Old 12-05-2005, 10:54 PM   #2
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start with this thread and I will try to find the rest of them....

http://www.bonnevilleclub.com/forum/...966&highlight=
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Old 12-05-2005, 10:57 PM   #3
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Here is where it all started......good luck, it is an easy fix if this is your problem

http://www.bonnevilleclub.com/forum/...asc&highlight=
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Old 12-06-2005, 09:19 AM   #4
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Good links Nick...

You might want to start first with the vacuum hose that should be connected from your engine to the vacuum canister (odd shaped plastic can on firewall next to windshield wiper motor). The 96+ bonnevilles have the canister under the passenger front fender, 92-95 is located nicely on the firewall.
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Old 12-06-2005, 09:59 AM   #5
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Check for vacuum just like the previous poster said. Then you're ready to check the vacuum to the system inside the car behind the glovebox.

If it quit suddenly, you're likely to have a vacuum problem. Leak in storage container in engine compartment, hose off, hose burned in two. If it occasionally did this by blowing on defrost only and didn't start suddenly, you probably have a vacuum problem in the programmer inside the car.

I used the method in pictures in one of the links in earlier posts. I used gasoline (1/4 inch) hose--about 2 inches per connection. Not pretty as the one linked, but free from friendly, local NAPA store. I bypassed the little block connector in programmer where the plastic material softens and sucks together blocking the vacuum through the hoses to the other vacuum motors that move the vents in the heater box to direct air. Usual first symptom (on dual auto air units) is that the door to make air come out dash ducts for air conditioning won't work; the air just goes on up and out the defroster instead of in your face out the dash vents.
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