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air conditioning and heater 700 1991

Hi All,

I need help on diagnosing the problem with the heater on my '91 740GL.
Both air conditioning and heater stopped working. I can live without the first but it is getting colder in colorado.

The people from the auto shop said that the compressor is not getting power.
It could be a problem with electrical wires b/n the stitch and the compressor or the control unit, they said.

I have worked somewhat on the car and love to fix things but have no idea at all how the air conditioning system works.

Any. Any help on how to track down the problem would be greatly appreciated!

Thanks
Stefan






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