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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Have a 2009 liberty, climate fan runs on high always, doesn't reduce speed. Also vent positions won't change direction of air


IF FAN RUNS ON HIGH ONLY AND STOPS ON ALL OTHER SPEEDS THE FAN CONTROLLER (REOSTAT) IS BAD,THE VENT POSITIONS IS A BAD SWITCH ON DASH OR BAD ACUATOR MOTOR ON VENT DOORS

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check emissions vacuum for disconnected lines as most climate controls use vacuum baffles for air flow..

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My climate control only blows out cold air but the rear climate control works as it should


Could be the controller or a faulty blend door.
The blend doors direct air thru the heater core and evaporator along with the vents. The controller uses electric motors to change the direction of air flow.

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03 IMPALA.It won't switch from defrost to vents or to floor,also where is actuator?


does this vehicle have electronic climate control. if so sometimes the actuators get "stuck" in one position if the settings have not been changed in a while. under the driver's side on the dash toward the center and the passengers towards the center on that side, with dual climate control. sometimes removing the actuators and operating them with them pulled out (if they turn) then replacing will work. hope this helps

Jan 26, 2010 | Chevrolet Impala Cars & Trucks

1 Answer

Climate controls wont change from vents to defrost


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.

Jan 02, 2010 | 1989 Pontiac Grand Am

1 Answer

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


Could be that a pencil or similar fell down the defrost vents on the dash and are holding the door from changing position.. requires some under dash detective work while practically standing on your head to locate the problem. If you can, take off the flex tube to the defrost vents and check for obstructions. While you're there check vacuum motors that control the flappers. Remove the vacuum hose and push or pull the actuator in the opposite direction from where it is, put your finger over the tube and release actuator, if it returns to original position it has a leak and will need to be replaced.

Dec 11, 2009 | 2004 Chevrolet Silverado

1 Answer

99 ford ranger is stuck on defrost. hot and cold controls still work but doesnt come out of defrost position.


defrost is usually the default/resting position for interior vents. you probably have a cracked/broken vacuum line between the climate control unit and the vent actuator

Sep 29, 2009 | 1999 Ford Ranger SuperCab

1 Answer

2002 suburban wont switch from vent to any other position already changed heater control (auto climate control w/o display)


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

Sep 08, 2009 | 2002 Chevrolet Suburban

1 Answer

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.

Mar 20, 2009 | 2000 Ford Windstar

1 Answer

Loss of climate vent control


You are losing vacuum source to the system.
There should be some kind of vacuum reservoir under the hood.

Aug 26, 2008 | 2001 Jeep Wrangler

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