Question about Chevrolet Monte Carlo

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I have a 2000 monte carlo with bi level a/c and drivers side is warm and pass side is cool what is the problem? thanks rick

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  • Anonymous Jan 12, 2009

    Ac blowing hot on one side



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Your blend door actuator (also called air temperature actuator) motor is bad. It's pretty common. The bad part is located under the dash on the driver's side, toward the center of the dash It is mounted on some AC ducting, with the top of the unit facing toward the driver's door.
Here's a forum thread discussing this issue (not monte carlo specific, but the pics of the part and the general location of said part is nearly identical. They take out a passenger side actuator motor in the thread. Driver's side is similar):,41201.0.html

For a temporary fix if you're slightly inclined to working on cars, get under the dash and remove the plastic covers hiding the wiring in the driver's foot well (a couple push tabs and a couple phillips screws is all that holds it up). Locate the driver's side actuator motor (it's partially hidden by some wiring, you'll have to reach up there toward the center of the dash to find it), remove the unit (2 gold colored phillips screws and a black connector, a #2 phillips bit in a quarter inch socket applied to a small quarter inch drive ratchet works well here), and then manually flip the blend door to the "cold" side (there will be a little knob sticking out of the AC ducting that you'll see once you take off the actuator motor. Just grab that knob as gently twist left or right to make the air temp hot/cold).

Here is a cheap place to get a replacement:

GM wants $100 for the same part, not including the labor to install it (probably $45 to $90 for labor)

Good luck.

Posted on Aug 15, 2008


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