Question about 1998 Buick LeSabre

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AC/heater won't blow out of MID vents when selected.

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  • dbmiller33 Jul 31, 2009

    Rylee, thanks for your inputs.

    I need to adjust my complaint. I'm finding that the MID (dashboard) vents do blow after 5 - 10 minutes.

    I've been unable to trace the vacuum line from the cannister to the dash. What appear to be vacuum lines behind the glove box (removed) appear to be OK.

    You mentioned a possible problem with the vent motor. I've observed that the vent button/switch seems to do nothing so maybe you're on to something.

    I failed to check the hose to the manifold. I'll try that now.

    Again, thanks.

    Don

  • dbmiller33 Jul 31, 2009

    The advice helped me to learn more about how my AC works and to better understand what is going on when it appears to be working so I can deal more intelligently with the repairman now. Thanks.

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  • Master
  • 8,619 Answers

Hi

The heat is controlled by the vacuum motors under the dash each time you make a change in your HVAC a separate vacuum motor will open or close a different heater door. If the defroster and the floor work this tells us there is vacuum at the control switch, so knowing this it is safe to assume there is a problem with the HVAC motor that is for the vent position, most likely under the dash where you will find several silver vacuum motors each will have one or two vacuum hoses ---- one is not hooked upright have a bad vacuum motor for one of the doors for the ducts.
It can also be that you have a Vacuum leak at the Vacuum Canister or a bad Vacuum hose. The hoses are very small (about 1/8 or 3/16 inch) some- times it’s a Actuator 4 the mixer doors but mostly its just a small Vacuum leak. Check the hoses from the intake manifold to the fire—wall as they could have gone bad.

Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks
Rylee

Posted on Jul 31, 2009

  • Rylee Smith
    Rylee Smith Jul 31, 2009

    Hi Don



    Please check it and revert for further assistance if required.



    Thanks

    Rylee

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As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

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http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

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http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

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http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html
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http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

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http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

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