Question about 2000 Oldsmobile Bravada

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Vent control for climate control does not change positions

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Air will only come out of the defrost vents on the dash i assume? The defrost vent is the default position when the system looses vacuum. Under the hood look for a broken or disconnected vacuum line on or near the engine in the area of the passenger side of the firewall. You may even hear the a slight "hisss" indicating a vacuum leak. Reconnecting the line to the appropriate port will restore proper vent operation.

Posted on Sep 04, 2010

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There may be a problem in the climate control head. The most common problem with HVAC systems of that error is a broken vacuum line. Usually the feed line to the control panel is broken or disconnected from the engine and it is stuck in defrost mode as it's the default mode. If your stuck in the vent mode there may be a broken line at the climate control panel, a broken line to an actuator or a bad actuator.

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When I put the climate control to defrost it blows through to center vent like the flapper valves were not moving far enough to the defrost position

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It sounds like the mode actuator is defective. It is what changes the different modes, floof,vent,defroster.

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Steady thumping every couple seconds in the venting system

On my 2000 Windstar, I had this same problem. I replaced the vent door motor and the problem went away. It is roughly $40 from O'Reilly. The motor is a white box located behind the radio. Remove the radio, then remove the plastic trim piece around the radio and climate control. From there, you will be able to remove 4 8mm screws from the white motor. Unplug the electrical connection and remove the motor. To put it back together, do the reverse of these steps using a new motor.

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1 Answer

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