ana fee mushkillah - 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 04-27-2008, 02:20 PM   #1
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Default ana fee mushkillah

ana fee mushkillah its means i have a problem.. thats is arabic word..

i have a problem w/ air system of my AC, because if i step on the gas and im on 1st to 3rd gear or i have a heavy load the air in the dashboard are all gone and i notice that the air that suppose to be in the dashboard are now on the floor...

pls help me.. specially now the temp here going up..
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Old 04-27-2008, 02:27 PM   #2
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You have a vaccuum feed that goes to the HVAC system. Once vaccuum is lost, i.e. when you give it gas, the vents change position. The factory uses a check valve to solve this problem. Perhaps yours is dead or missing.

It will be under the hood, near the firewall.
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Old 04-27-2008, 02:40 PM   #3
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where is the HVAC system.. where should i look first? how can i know if the vaccuum
is dead or missing? i have no knowledge in engines..

pls help i needed badly..
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Old 04-27-2008, 02:57 PM   #4
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ok...HVAC is short for Heating, Ventilation, and Air Conditioning. Basically, the box underneath the dash that houses the heater core, evaporator, and all the vents.

Look under the hood and check all of your vaccuum lines. Make sure none of them are brittle or broken (in your climate, they may very well be). Next, look for one that goes from the engine and disappears into a small box on the firewall. That box is a vaccuum canister...it stores vaccuum and releases it as needed. That canister also feeds the cruise control servo that is on the side of the engine, on the transmission.

On that line, there should be a check valve. It looks like a small disk that is inline with, well, the line. The check valve allows air to flow in only one direction...so in other words, only vaccuum should be present in the line AFTER the valve.

Hope this helps you out.
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Old 04-27-2008, 03:06 PM   #5
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ok thanks,
youll be hearing from me soon..
tommorow ill check it. kinda dark in here its 9:30pm and
its 37 degrees celcius kinda hot..
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Old 05-01-2008, 08:41 AM   #6
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we have the same problem and
ive checked all vaccum hose all are ok..
do you think if possible i have a bad cheack valve?
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Old 05-01-2008, 09:29 AM   #7
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Look for the black tank between the maxifuse relay cover and the windshield wiper motor assembly at the top of the firewall.

The black tank between them is the vacuum accumulator. It is designed to hold vacuum for long enough to prevent this problem, and has a checkvalve on it'* input to prevent this.

In this picture, do you see the green INTENSE sticker? That'* the accumulator. Underneath is a vacuum connection. See if it has a checkvalve installed in the line that goes to the manifold:

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Old 05-01-2008, 12:00 PM   #8
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yes it has check valve installed on it...

and there is another hose sitting besides.. and they are merging into 1 hose going
to the engine...

its possible that check valve is dead/busted?
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Old 05-01-2008, 06:51 PM   #9
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Blow through each end. It should flow one way, but not the other.

Don't let your friends see you do it.
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Old 05-02-2008, 03:12 AM   #10
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when i blew in one hole, (im talking about that 2 small tubes).. it flows to other side and in the front.. that should be in one direction only right? and when i blew it. its like hard to flow the air. like theres something inside that blocks the airflow..

and when i blew it in that one tube (thats is the one w/ no tube in the side) it flows the air in 2 direction.
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