The problem is the servo motor that swaps the vent door from the cooling coil to the heater coil.Answerbefore you tear apart the dash to get to your driver side servo motor-disconnect your battery for 5-minutes, with both front doors open reconnect your battery(this resets your on board computer),then turn your car on and turn your a/c on to high with the coldest setting on both sides for dual air systems and leave the car running for a few minutes. you will feel the air cold again. there is a sensor on the passenger side that will trigger the servo motor to not move if the front door is closed. servos usually get stuck after the power was cut off. if this does not do it, have your a/c sytem checked for leaks.
I have the same problem on my 99 Olds Intrigue and tried disconnecting the negative battery cable for 5 minutes. That did not correct the problem-no change. Any advice is welcome.AnswerThis is a Dual Climate System. If you're not familiar with this setup, there's a driver and passenger climate setting. The passenger setting knob is on the right of the climate control console. If you have already properly adjusted this setting, there's a problem with the servo motor being out of the preset range for the a/c & heater doors. Every time power is cut from the unit, the servo resets the doors by doing a "sweep" from full cold to full hot maximum range. Over time the servo will fall out of range from constant full range flexing, and the part that controls the range limit must be replaced. Reseting the main module by disconnecting the battery has a slim chance of successfully fixing the issue.
The car seems to do this after the battery is disconnected or looses power while the A/C is in the on position. I tried everything that I saw on the Internet. The only thing that worked for me immediately was to remove the a/c heat control unit from in the car, directly below your cars radio/head unit but make sure to turn the a/c off first or the ac/c doors inside will stay open and continue to blow heat in when reconnected. (how to do)Turn off the A/C first, take the cover off and remove the two screws, pull the unit out, unplug the wire harness and let it sit for 30 seconds. It will reset itself plug it back in and the a/c will work again, of course the put the cover back on ect..Should take less than 5 minutes to do.
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