heater vent control doesn't change air distribution

50

Asked by Jun 18, 2016 at 10:57 PM about the 2002 Buick LeSabre Limited Sedan FWD

Question type: Maintenance & Repair

my 2002 LeSabre Limited heater vent Air Flow control appears to work, it
lights up and when I press the button it indicates that it is changing the
output from top to middle to bottom, etc, but the airflow doesn't change, it is
always coming out the top, at the windshield, and a little at the bottom, but
essentially nothing coming out all the middle vents across the width of the
dash. I don't know if the venting is controlled by electrical drives or vacuum.
I removed the right bottom panel and all I see are electrical
wires/connectors, and I don't see any vacuum lines. Can anyone tell me
what/where the controls are for the various vents? Thanks for any help.

4 Answers

81,815

Sounds like this may be the HVAC Blend Door Actuator that directs the air flow from defrost to vents to the floor. It is an electrical part up underneath the dash board, attached to the vent system somewhere.

1 people found this helpful.
50

Thanks for the info. I was afraid it might be something up behind the dash - not the easiest to get to - but I'll look for some help online as to how to access it. I was hoping it would be a loose/broken vacuum line, but that would be too easy.

1 people found this helpful.
50

More info about my problem: The remote trunk release on the door doesn't work, and the diagnostic trouble code plug under the dash doesn't connect with a code reader. Apparently the climate controls are operated electrically, and I wonder if all these symptoms are related to one component in the car. Any help is appreciated

81,815

Possible, on older models the scanner plugin tied into the cigarette lighter power supply, so yours may be tied into the HVAC control power circuit. So all you would have to do to check would be to get a test light and check for power at the plugin of the HVAC control module, or at the trunk release circuit. Look for blown fuses also.

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