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HVAC Question

ralendrum

By ralendrum
in 964 Series

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ralendrum Member

ralendrum

Posted
Posted

I have been trouble shooting the Heating/Air Conditioning in my 1990 C4. At first I thought that the servos must have failed but it now apears that it could be the main control unit. I removed the plugs and jumpered the pins to se if the motor / gate would work. All 3 I tried work fine and under their own power. I did a little reading and it would seem that the air sampling fan in the back of the controler is not working either. The main fan controls all seem to work so I set the servos to cold and thought I would drive it this way for the summer. I found a rebuilt unit on line for about $1200 and I would spend the money if I was sure it would fix all my problems. The A/C compressor clutch does not engage but until I am sure themain unit works I am not too worried about that.

Does anyone have any suggestions on how to check the unit out to confirm if it has completely failed. Does anyone know of anything that could disable all of the servos? Need Help.

Thanks

Bob

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