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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 06-19-2003, 12:59 PM   #1
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Default middle a/c vent

my middle a/c vent decided not to work anymore, the top and bottom do though. anyone know what is up?

thanks.
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Old 06-19-2003, 02:48 PM   #2
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Maybe its time for you to clean out your system?
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Old 06-19-2003, 07:25 PM   #3
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Default Re: middle a/c vent

Quote:
Originally Posted by 95naSTA
my middle a/c vent decided not to work anymore, the top and bottom do though. anyone know what is up?
Lost your manifold vacuum? If the ventilation system has no vacuum to work with to change its duct settings, it'll default to blowing through the defroster and/or floor outlets only. Maybe someone knocked a vacuum line off somewhere under the hood.
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Old 06-19-2003, 11:48 PM   #4
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humm... i'll poke around and look for something, but do you know where the lines are that could be disconnected?

thanks.
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Old 06-20-2003, 03:51 AM   #5
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oh oh oh...(I love this one) ...check the small black tank to the left of the brake master cylinder. There should be two vac lines hooked up to it. If not, one should be hanging around very close.
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Old 06-20-2003, 08:32 AM   #6
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nice i'll look at it today
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Old 06-23-2003, 09:19 AM   #7
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yes more than likely it is the vacum hose under the hood..on the black box next to the master cylinder..i have had the same problem last week here is my post and how it was fixed thanks to jwikoff99!


http://www.bonnevilleclub.com/forum/...763&highlight=
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Old 06-23-2003, 09:56 AM   #8
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awesome i still gotta check it out, i have no time b/c i've been studying like crazy for my calc 2 final. that stuff ain't eazy. i'll check it out soon
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Old 06-23-2003, 01:58 PM   #9
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ok so i took a look at in on my lunch break, i found the two vaccum hoses to the left of the firewall and they were both plugged in BUT the one hose was really weird. it had a larger hose that it also connected to w/ some fitting. but everything was together.
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Old 06-23-2003, 02:21 PM   #10
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Do you hear any hissing noises with the engine running in that area?
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