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Tom 4/21/2010

2001 Jeep Grand Cherokee Laredo 6 Cyl 4.00L

Body & Interior

Air is always vented to window defrost - other selections do not work

1 Answer


HouseCallAuto 4/21/2010

Air flow from the Heat Vent Air Conditioning (HVAC) system is only coming out of the defrost position. It is not an automatic temperature control system.
Tests/Procedures: 1. Check the vacuum supply to the control head.

2. Check under the hood for the vacuum source to be broken somewhere.
Potential Causes: Control Head
Leaking Engine Vacuum

Tech Tips: If vacuum is lost to the control head it will default to defrost.


bigbucks1445 6/3/2010

there is a vacume under the battery box remove the plate also that the battery sits on! its behind the passenger side headlight! mine got hit and broke the tit off the vacume booster you will she the rubber hose if not hooked up you can plug it and it should work !

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