Question about 1998 GMC Safari

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Vent control not working. - 1998 GMC Safari

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Usually due to vacuum leak. GMC uses poor quality plastic piping going form the left side front of engine by ac accumulator and runs to the driver side of engine

Posted on Oct 23, 2010

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91 sierra heater control display comes on shoes fan on low temperature centered vent on floor but none of the controls work


Could be the controller. Check the vacuum line from the engine to vacuum ball. then from the ball to the controller. Vacuum is what controls the vent actuators.

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I hove 1998 jimmy heat works good ,when i change


The switch that controls the defrost, heater and vent settings have gone bad and needs to be replaced. Auto Zone should have that part or you can do the Salvage Yard for around $10.00. The switch that controls the setting has a diaphragm and when it fails, the vacuum from the air lines starts to make the sound you hear and there is not enough pressure to engage vent doors. It take about 20 min to replace from start to finish and your only going to remove two screws from the dash over the instrument panel, the trim panel around the stereo and climate control just clips in place. You don't have to remove the trim panel, it's to much of a pain. the climate control is held on by 4 bolts and the vent setting is held on by one bolt. Once you have the climate control panel unbolted from the dash, disconnect the vent control vacuum lines and then replace the vent control switch. Once replaced, put everything back together in reverse the way you took it apart. Good luck and check that the new vent control works before you put everything back together, just be take caution when you have the engine running to check.

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it sound like its one of two things 1 it could be the function control knob on the dash is no good or that the vent/ def. door control motor is no good possibly seized up. the second thong that I would suspect is that the door itself is jammed in the on spot

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