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A/c only blows thru defrost vent on 1998 cadillac deville

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  • rpaul881 Jul 25, 2009

    no vacuum lines present it appears this is electrical addvise or direct me to diagram of vacuum hoses.

  • rpaul881 Jul 26, 2009

    Is there another possiblity to the problem because, nothing seems to be a definite solution, I need more time to troubleshoot.

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The vacuum hose is on the passenger side in the engine compartment between the heater hoses and the fender, probably has a leak.
It could also be the blend door actuator which is usually beneath the dash on the passenger side where your blower motor is. To access it, you need to remove most of the dash, a pain to do, but that is what has to be done. Let me know how this turns out.


Benjamin

Posted on Jul 26, 2009

The air blend door actuator and/or climate control unit is probably faulty...most likely it is the air door actuator...The actuator is usually in the vent housing behind the control panel. You can follow the vacuum lines from the A/C heater control to the actuator..Rockauto.com has a new one for $98.79...The A/C Delco part number is:1572215

Click on the link to go to there website:

http://www.rockauto.com/catalog/raframecatalog.php?carcode=1435225&parttype=10721&a=FRc1435225k1302151

Posted on Jul 25, 2009

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  • Master
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The problem is the blower door actuator. It's vacuum driven and diverts incoming air from the defrost, to vents, to the floor and any combination. When the air flow can't be redirected, it's a very good indicatioin of a vacuum leak.

To identify the leak, turn the car on with the AC on high. Open the hood and start tracing the vacuum line, starting at the firewall on the passengers side and work your way backward. You're looking or listening for a pinhole in the line. You may find no holes but the line itself is disconnected altogether. Best of luck finding the vacuum problem and feel free to post back with any questions or concerns.
Greg

Posted on Jul 25, 2009

  • Greg Margossian
    Greg Margossian Jul 26, 2009

    Check the line on the inside of the car, up under the dash by the steering wheel. You can trace it backward from the driver's side to the right under the glove box before it enters the engine compartment.

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Posted on Jan 02, 2017

heavymetal77
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SOURCE: a/c only blows thru defrost vent on 1998

The heater control in the dash is probably bad.

Posted on Jul 15, 2009

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Usually a sign of a blend door problem. The blend door or doors are controlled by the HVAC controller, either by small electric motors or vac.
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You'll need to check the power source for the blend doors and their operation. Usually when the system fails it sets a code in the computer.

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