1996 SSE Pontiac Bonneville AC Problem - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-27-2007, 04:44 PM   #1
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Default 1996 SSE Pontiac Bonneville AC Problem

Hi. I am having a strange problem here. When I bought the car not to long ago, I turned the AC on and it shows that it is on but no ac on. The air still blows but only on the top and bottom but not in front, what I mean is that even with the heater, the air only blows from the defrost or the feet. It does not even blow air in front of you. So I kinda of have two problems, one being the ac doesnt work and two the air coming out. Does any one have similar problem and if so what did they do to fix it? Can anyone point me in the direction to figure this problem out before I take it to a mechanic? Thanks.
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Old 03-28-2007, 06:57 PM   #2
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Does the A/C clutch engage, does the compressor turn? As for the other problem, it sounds like an air mix door malfunction, or actuator malfunction. You may want to do a search, there are quite a few threads on air mix doors & actuators.
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Old 03-29-2007, 03:24 AM   #3
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I dont think it turns on. I am not sure but I will check tomorrow. I will also check on the actuator malfunction. Hopefully I can fix before I send to mechanic.
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Old 03-29-2007, 08:11 AM   #4
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Here'* a long read. Make sure you find the links on pages 4-6 that have to do with the small vacuum lines for the HVAC programmer.

http://www.bonnevilleclub.com/forum/...ighlight=vents

You will want to check for vacuum on the purple line and if that works, then aim toward replacing the nipples that have closed. Air mix actuator would control hot/cold and in my opinion is probably not the root cause on this one.

For the AC, check the relay under the maxifuse relay center on the firewall..sometimes corrosion etc can keep it from working properly.
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Old 03-29-2007, 06:31 PM   #5
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This does sound like a combination of issues to me.

No AC could be one of several things.

Like was mentioned above, check to see that the AC clutch on the front of the compressor is engaging (spinning) when AC is commanded on. If not, then a pretty easy (and free) thing to check would be the AC relay (under the maxi-fuse center fuses on the firewall in the engine bay). The AC relay is the one closest to the passenger side. You can try swapping the horn relay, the second relay from the passenger side and see if the clutch engages. If so, the relay is bad, if it does not begin to spin, then other electrical and freon checks are in order.

If the AC clutch does engage, then I would suspect the airmix door actuator, but until we get the AC clutch working, I would wait on the airmix door.

Air not coming out of the correct vents is almost always a vacuum issue. Either collapsed nipples on the connector to the HVAC programmer (fix in the link above), or a vacuum supply issue (the purple line Bill mentioned above).
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Old 04-10-2007, 11:25 PM   #6
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i have the same exact problem with my 96 se. i recharged my system and my a/c worked for a few days then just stopped. the air just blows from the top and bottom and the small vent in the back. i also live in orlando florida.
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