99 STS no heat through dash vents
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 99 STS no heat through dash vents in Past Cadillac Vehicle Discussion; My 99 STS has heat to the floor and to the defroster, but none through the dash vents. I had ...
  1. #1
    dormaj is offline Cadillac Owners Member
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    99 STS no heat through dash vents

    My 99 STS has heat to the floor and to the defroster, but none through the dash vents. I had a similar problem 2 years ago, but it was the floor that would not throw heat ($750 later all was well). I'd like to try a fix myself this time.

    Thanks!

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 99 STS no heat through dash vents

    I would suspect a bad mode door actuator. Any codes?

  4. #3
    dormaj is offline Cadillac Owners Member
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    Re: 99 STS no heat through dash vents

    No codes other than my good old P0716/P0717 (input speed sensor no signal).

  5. #4
    dormaj is offline Cadillac Owners Member
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    Re: 99 STS no heat through dash vents

    Can some help me with info on how to R&R a bad heat/AC mode door actuator?

    Thanks! Jeff

  6. #5
    kayden is offline Cadillac Owners Member
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    Re: 99 STS no heat through dash vents

    Quote Originally Posted by dormaj View Post
    Can some help me with info on how to R&R a bad heat/AC mode door actuator?

    Thanks! Jeff
    I put mode door actuator in the search,on top of page.There was some info that might help you..

  7. #6
    NTX_Caddy is offline Cadillac Owners Member
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    Re: 99 STS no heat through dash vents

    Just to clarify, you have no hot air through your dash vents when you set your a/c to blow through them (the man with the arrow pointing at his chest)? When the a/c blows heat in auto mode it blows the hot air to the floor and defroster always unless you manually adjust it (something I learned after an embarassing trip to the dealer). If it is not blowing when manually set I would say it is an actuator problem.

  8. #7
    SwampeastMike is offline Cadillac Owners Enthusiast
    Automobile(s): 99 STS, White Diamond
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    Re: 99 STS no heat through dash vents

    In cold weather with the system set to full auto, warm air should be coming mainly from the floor with some to the windshield and none from the dash vents. Add bright sun however (even in quite cold weather) and some air will come from the dash vents as well but it will be noticeably cooler.

    Set the mode manually for air from the dash vents--if it works then it would seem that you have no problems.

  9. #8
    johnny kannapo's Avatar
    johnny kannapo is offline Cadillac Owners Connoisseur
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    Re: 99 STS no heat through dash vents

    Vent door #1. Where is it located?

  10. #9
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 99 STS no heat through dash vents

    Next to vent door #2?

  11. #10
    BIG ERN is offline Cadillac Owners Fanatic
    Automobile(s): 98 STS
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    Re: 99 STS no heat through dash vents

    i think the one you need is situated above the dabin air filters thats the a/c, def mode actuator it threw a B1344 in my 98 sts i have no defrost or ac,its the blend door part no. ac delco 15-72631, about $60.00 at oehq.com

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