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www.aa1car.com/library/automatic_climate_control.ht Once you set a temperature on your car's automatic climate control system, ... you turn down the blower speed or change the position of the temperature setting. ...codes (which ordinary engine-only scan tools cannot), and a digital voltmeter to ...
If you have a fan that has different speed settings (1234, or low med high etc) and the only one that works is high - then the blower resistor pack has failed. If you have a climate control unit (where you just pick a temp you want) then the fan is controlled by the heating system and it sets fan speed. If you have climate control style try lowering the temp to a lower setting (current temp in vehicle) and see if fan slows down. If not then climate control unit or fan resistor bad. If dial type and you get nothing on lower settings (only high works like mentioned above) you need to change blower resistor. It is located under dash near the fan itself. Look for small unit bolted in duct near fan with wire plug going to it.
You have four possible problems. Fuse, fan motor, fan switch, or fan speed controller. The first step is to check your fuses. Actually pull the fuses for the climate control out and look at them (sometimes cracks and end corrosion don't show up until you remove the fuse). Your next step is to run the car with the A/C fan set to high and use a multimeter to check for power and ground at the blower motor. After that I need an answer to the following question diagnosis can go any further. Does your car have knobs for the climate control system or a vertical row of buttons?
Based on the limited information provided, it would appear you have a bad climate control control board. This controls all heater/AC functions including climate control. If you're unable to change temperatures and/or fan speeds, the board is most likely bad and needs replacement.
I had the same problem. AC computer forgot where the adjustment flaps are. - Start the car. - Press Auto button on the AC (if you have this option) - Increase fan speed (make shure it is not on minimmal setting) - Decrease the temperature setting to the minimum -> "Lo" - Wait about 10-20 seconds - increase the temperature to the maximum -> "Hi" - Wait about 10-20 seconds
- Set the temperature that you like.
With this procedure you force the AC to move the temperature regulating flaps to go to both end-positions and motors get calibrated again.
If this does not help, there must be a bad contact somewhere or the fpals may get stuck. -> repair.