Thread: HVAC Issue. Cant switch between any of the vents for heat

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  1. #1 HVAC Issue. Cant switch between any of the vents for heat 
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    Hey guys,

    So starting today i cant switch between all the vents in the car (1999 GTP). I tried turning the heat on and off about 8 times but that did nothing. It still sounds like its blowing strong and still nice and warm, i just cant switch it between defrost or the floor or even the dashboard vents.

    What could be the issue here?
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  2. #2 Re: HVAC Issue. Cant switch between any of the vents for heat 
    Killa Bee Scottydoggs's Avatar
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    theres a vac line on the top of the super charger, it leads to the fire wall then down the fender to the fuse box where it them joins a loom of wires and enters the cab of the car. check this line for cracks or leaks. it powers the vent directions.

    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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  3. #3 Re: HVAC Issue. Cant switch between any of the vents for heat 
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    Alright i will take a look, thanks!
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  4. #4 Re: HVAC Issue. Cant switch between any of the vents for heat 
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    I took a look at that vacuum line and it looks like its ok to me
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  5. #5 Re: HVAC Issue. Cant switch between any of the vents for heat 
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    I should also mention its the dual digital climate control that i have in my car.
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  6. #6 Re: HVAC Issue. Cant switch between any of the vents for heat 
    Killa Bee Scottydoggs's Avatar
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    still vacuum powered.

    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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  7. #7 Re: HVAC Issue. Cant switch between any of the vents for heat 
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    So more than likely i still have a vacuum issue? il have to get a mechanic to look at it then.

    Is there anything else i should test to make sure its a vacuum issue? like cruise control?
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  8. #8 Re: HVAC Issue. Cant switch between any of the vents for heat 
    Killa Bee Scottydoggs's Avatar
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    you can check that your self easy. if that line is cracked the vents wont change direction.

    or the climate control head unit in the dash took a dump.

    the vac line is a free check, and would cost less then a buck to fix most of the time.

    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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  9. #9 Re: HVAC Issue. Cant switch between any of the vents for heat 
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    Is it common for the control head unit to go for a ****? cause that line to my eyes looked fine.... but im a computer guy... not a car guy, lol

    Edit: I'll turn the car on and see if i can hear any leaks. Should i turn the heating system on and then listen? or should i hear a vacuum leak without the heating system on?
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  10. #10 Re: HVAC Issue. Cant switch between any of the vents for heat 
    Killa Bee Scottydoggs's Avatar
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    that line under the hood runs to a box behind the dash then to the vac pumps that move the vent controls levers. so you may hear a hiss under the dash if one of the inside car line broke, or the vac pump its self.

    ive seen on the board here where the unit does go bad, then others who changed it and still didnt get it to work.


    these levers are plastic under the dash, they break all by themselves sometimes. so if you open up the dash some you can see if the vac pumps are moving, if they are the lever arms snapped.

    this how to is for the blend door actuators, but the vac pumps are right there next to them, its the round part in the lower right of the first pic. theres one on the pass side as well, removing the glove box door gives you full view of that side.

    http://www.grandprixforums.net/showt...door+actuators

    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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  11. #11 Re: HVAC Issue. Cant switch between any of the vents for heat 
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    So now its working again.... I drove home from work and it was working no problem. I even stopped and restarted the car again as a test and it was fine. What could be going on then?
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  12. #12 Re: HVAC Issue. Cant switch between any of the vents for heat 
    Killa Bee Scottydoggs's Avatar
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    could be the climate control's buttons are dying or its broken inside, you hit a bump and it works now, hard to say.

    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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  13. #13 Re: HVAC Issue. Cant switch between any of the vents for heat 
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    Well I'll keep an eye on it I guess. I do have a different issue though. Every now and then my air bag light comes on for up to 5 min (sometimes less) then goes away. Started at about the same time as my vent select issue.
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