Thread: Air flow control

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  1. #1 Air flow control 
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    Hello group,

    This is my first question, so I hope I make it clear enough to understand. I'm having an issue with the air flow for heat/air. The blow motor is running fine, but apparently there is something that controls where the air gets diverted to - like upper vents, floor vents, upper vents + floor vents, defrost, etc. When I switch between them, it seems it takes several seconds, if not minutes (if it ever switches at all) for whatever it is behind the dash to fully change so the air gets diverted where it needs to go.

    For example, now that's it's prime-time summer time, I'm using my A/C a lot. When I switch to upper (dash) vents only, it's like the air flow coming from the vents is very weak. A couple days ago I drove into town and about 1/2-way there I heard something "slap" under the dash, like a diverter door or something finally moving into the position where it needed to be, and then all of a sudden......WHOOSH! The volume of air was strong and what it should be.

    What controls this switching mechanism, and what should I be looking at/to for determining why the mechanism isn't as responsive as it should be when changing the output location.

    Thanks!
    James
    1999 Grand Prix GT
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  2. #2 Re: Air flow control 
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    Hey jlank I was having the same issue last year but for some reason it seamed to start working one day and I haven't had a problem since. Also iirc the damper is controlled with a vaccum. I could be wrong
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  3. #3 Re: Air flow control 
    GT Level Member JamesIvey24's Avatar
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    likely a blend door actuator
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  4. #4 Re: Air flow control 
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    Margaritas?
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  5. #5 Re: Air flow control 
    GTX Level Member Travisgt2's Avatar
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    Blend door actuator
    04 GT2: 180 t-stat, cold air intake, reptile tune, plog, hv3, gt1 cam, 90#springs, new push rods, new lifters, port polished heads, lim, uim and tb, 06 Impala brakes and steel brake lines. Cosmetic: black roof rails, under glow, Pontiac ground light, blue hud dic radio controls and cluster. To come custom hood.
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  6. #6 Re: Air flow control 
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    Thanks guys - I'll check into this!
    James
    1999 Grand Prix GT
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  7. #7 Re: Air flow control 
    Killa Bee Scottydoggs's Avatar
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    not a blend door. those make it hot on one side.

    your vents are vacuum powered. off the engine is a line to the fire wall, it then leads down the inner fender under the fuse box and into the cars harness. if you changed your battery or removed it, check the line there, it may have snapped. or it can break from the engine any where to the cars harness.

    if the vac line under the hood looks ok, then theres a box under the dash the same line leads to, it goes bad.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  8. #8 Re: Air flow control 
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    Thanks Scottydoggs - where does the vacuum line tie into on the engine? If I can locate that I might be able to trace it back. Thanks!
    James
    1999 Grand Prix GT
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  9. #9 Re: Air flow control 
    Killa Bee Scottydoggs's Avatar
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    na engine, back of the upper intake, next to the brake booster hose.


    sc atop the sc next to the brake booster hose.

    both mount to the fire wal then down the pass side fender under the fuse box and into the cars wire harness.

    you can see it on this pic.


    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  10. #10 Re: Air flow control 
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    It looks like you have the supercharged engine? Mine is a GT with the 3800. Is the hose the one I have circled?

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    James
    1999 Grand Prix GT
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  11. #11 Re: Air flow control 
    Killa Bee Scottydoggs's Avatar
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    thats the booster hose, follow the same hose to the back/ side of the intake, next to it is the small line that you see in my pic near the alt to the fire wall. it leads under the fuel lines to the manifold on top the blower there.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  12. #12 Re: Air flow control 
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    Ok, I'm just getting back around to this. I believe I have found the hose you're referring to. I tried to add attachments but they kept failing. Assuming I have the correct hose - how do I go about troubleshooting?

    Thanks,
    James
    James
    1999 Grand Prix GT
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  13. #13 Re: Air flow control 
    Killa Bee Scottydoggs's Avatar
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    go to a parts store, buy a foot of vac line, then cut two inches off it, cut the old dried up hose end off, replace with the new vac line you just cut.

    most stores will give you scraps to test fit with. if you get to use scraps, ask them how much for this 2 inch piece. after you find the right size. i bet the guy tells you to keep it lol

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  14. #14 Re: Air flow control 
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    Air flow control Attached Images
    James
    1999 Grand Prix GT
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  15. #15 Re: Air flow control 
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    That is what I believe to be the line. It doesn't appear to be blocked, but how will cutting 2" off the end help? Do I need to connect a vacuum tester to the line?
    James
    1999 Grand Prix GT
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  16. #16 Re: Air flow control 
    Killa Bee Scottydoggs's Avatar
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    if that hose, yes thats it, the little one, is coming off on its own, you take the old rubber off and replace it, then push it back on.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  17. #17 Re: Air flow control 
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    It's not coming off that I can tell. I can pull it off but it still feels quite snug.
    James
    1999 Grand Prix GT
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