Question about 2004 Pontiac Vibe

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Thumping rythmic noise from passenger side dash

Noise stops when you turn on the recirculate button under the air conditioning button.. Where is this actuator for the recircuater?? And does it need to be calibrated after it is replaced?

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Don't you just love it: thump, thump, thump, thump, pause, thump, thump...? I've found the best solution is to use compressed air as used in cleaning the keyboard of your laptop. Take a very thin (but strong) metal strip about 1/32" thick and gently place inside the edge of the recirculate button. VERY GENTLY depress the recirculate button just until the thumping stops. Apply just enough upwards pressure on the strip to hold the button in place. This creates enough of a gap for the air to blow behind the button. hold the can of air no more than one inch (1") away from the strip and aim directly to the left or right of the strip. Once you've cleaned from behind the button completely, that mother thumping (LOL) song will be no more.

Posted on Oct 18, 2009

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There is a servo that opens and closes the recirculation air door. It's a two wire connection and presumably the only way the computer knows when the valve is open or closed is to sense high (stall) current in the servo motor. This is a poor design because it stresses a plastic secondary gear in the servo and can cause a couple teeth to break off. Now the gears skip (making the clicking sound) and the motor never stalls so computer never shuts it off and the clicking continues. It's an expensive part (of course) but I fixed mine by opening it up and reversing the secondary gear so that the bad section is never encountered in the 180 degree travel. To find it, take off the glove box and it'll be on the left side under there. Kind of a tight pinch to get to.

Posted on Apr 26, 2015

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