Question about 1989 Buick LeSabre

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Air won't switch to defrost vents

Air only comes out of the dash and it doesn't matter where i set the controls. where is the diverter that switches airflow to the defrost duct?

1989 buick lesabre

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This system works with vacuum control doors. If you have a vacuum hose off under your hood it will cause this problem. Look on the passenger side near the evaporator - there should be a little round plastic bulb looking device - make sure it has vacuum to it. Also, check for other vacuum leaks in that area.

Posted on Jan 13, 2009

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My air runs cold but is stuck between defrost and front vent. How to fix


Pull the control panel out of the dash and see if the mode control vacuum switch has a good vacuum source or the switch itself leaks vacuum. The mode control is what moves the doors that diverts the air flow around to the vents, defrost and floor.

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1 Answer

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1 Answer

Air condition


Have you checked the diverter doors under the dash??
It sounds like a vaccum hose may have fallen off your vent controller.
I have had similar problems and found that the air WAS moving, but it was all going up through the defrost vents at the windshield.
A quick check of the vac. lines showed that one under the glove box was pulled off.
with the engine running, try setting the air settings to all the options ( vent/floor/defrost..etc..)
See it you can feel or hear the diverters moving under the dash..

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