Im not familiar with earlier models but,
There should be a switch on the drier that is most likely mounted in front of the radiator.
After it leaves the cab, goes to the thermal switch then the drier low pressure switch, this wire would go to the ac compressor.
Of course I could be wrong.
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86.5 Porsche 928, 75 Porsche 914, 2.0, 2001 Boxster.
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