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problem with defrost/AC

This is a discussion on problem with defrost/AC within the General Help forums, part of the LSx Technical Help Section category; Has anyone had a problem where their selector switch for the A/C quit working? I switch it from defrost to ...

  1. #1
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    black/pewter
    1999 Z28

    problem with defrost/AC

    Has anyone had a problem where their selector switch for the A/C quit working? I switch it from defrost to floor to a/c and any other place, but it does not switch the air flow. I checked the hoses behind the selector and all are fine there. Is there a vacuum hose somewhere i could check?

    Any ideas????

  2. #2
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    With a vacuum leak the default mode blows air only to the windshield/floor vents - if that's what is going on check all the vacuum lines behind the intake manifold.

  3. #3
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    black/pewter
    1999 Z28

    ok, thats what it is doing. it only blows defrost and floor. I'll have to see if i can get back there to look.

    Thanks

  4. #4
    Member WS-6's Avatar
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    Pewter
    2000 T/A WS-6

    defrost and floor

    I have a 2000 t/a and it does the same thing. Did you get it fixed? if so what did you do?

  5. #5
    Veteran 0rion's Avatar
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    I see this when people do intake swaps and forget to put the little vacuum line on the back or it falls off or something it'll cause this to happen.

  6. #6
    Member WS-6's Avatar
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    The car is stock and i felt behind the intake manifold and there is nothing unpluged. I 'd like to think i would hear the hiss if it was unpluged dont you.

  7. #7
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    Most times you won't hear it over the engine/belt sound?

  8. #8
    Member WS-6's Avatar
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    Pewter
    2000 T/A WS-6

    I checked today and all the vacuum lines are pluged in and there is nothing loose. I followed one line from the back of the intake to a tee of some sort by the computer under the hood passenger side which one goes into the firewall and one goes into a wire loom and to the front.The other line goes to a valve of some kind on the driver side. I checked behind the control pannel in the past and everything is in good shape. I will look into it more when it gets nice enough outside to drive it.

  9. #9
    Nitrous Tuner LS2Tuner's Avatar
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    It is due to vacuum loss as others said. There is sometimes a one way check valve that goes bad also. I can't remember on the F body's.
    If you take a hand vacuum pump and give the switch panel adequate vacuum I beat it will work fine.
    Don't be afraid of the bottle!!! Be afraid of your tune!!!

  10. #10
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    Black
    98 Trans Am

    I had this same problem last year. Drove me NUTS!! Turned out to be a L-shaped vacuum check valve under the hood, near the rear of the passenger side valve cover. It somehow had cracked. Replaced it (very inexpensive even at the "stealership" parts dept.), and it's been fine since. I bet that's your problem!

  11. #11
    Senior Member bigrondownhiller's Avatar
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    Black
    1996 Camaro Z28 vert

    My tahoe had the same problem. I Found a diagram online of the cables that switch the vents and noticed one of them popped off.

  12. #12
    Member WS-6's Avatar
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    Awesome, I'll look into replacing the valve next.I appreciate all of your opinions they are very helpfull.

  13. #13
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    Pueter/Silver
    1999

    I'm having problems with my head lights when i turn them off they are makin a buzzzing sound. and when i turn on my runnin lights my head lights pop up..any suggestions what might be wrong? is the head light moter goin out or is there a relay might of went bad???...

  14. #14
    Member WS-6's Avatar
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    Do you hear the noise only while they opening and closeing or does it continue afterwards as well? Is the noise comming from inside or outside the car? When you say running lights are you talking about park lights?

  15. #15
    ArtistFormerlyKnownAsMac Silver Streak's Avatar
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    All Black
    83, 87, 02 All WS6 T/As

    My blower and rear defrost just stopped working all of a sudden.. fuses all look fine... grrrrr I can feel when I select the different positions.. and if its warm air or cold.. and I hear the "hiss" ing noise when I change the selections.. but no blower.
    -Geno
    1983 Black WS6 "WindCharger"
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    Sold the other four f-bodies

  16. #16
    Member WS-6's Avatar
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    Possibly a relay, otherwise I am not sure good luck.

  17. #17
    Veteran 0rion's Avatar
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    Quote Originally Posted by 99ls1taJohn View Post
    I'm having problems with my head lights when i turn them off they are makin a buzzzing sound. and when i turn on my runnin lights my head lights pop up..any suggestions what might be wrong? is the head light moter goin out or is there a relay might of went bad???...
    headlight gear is stripped.......headlight fix

  18. #18
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    Black
    98 Trans Am

    Yeah, I've been runnin' on the free 180 degree "fix" for over 2yrs now.

  19. #19
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    Pueter/Silver
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    Do you hear the noise only while they opening and closeing or does it continue afterwards as well? Is the noise comming from inside or outside the car? When you say running lights are you talking about park lights?

    the parking lights.....can hear it bought inside and outside but louder outside...it dont make any noise when i open them just when i close them...

    thanks everyone for your help any more suggestions would be great!

  20. #20
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    Quote Originally Posted by 0rion View Post
    headlight gear is stripped.......headlight fix
    Dude....

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