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I think it is ground and 3 levels of resistance for the 3 fan speeds. If you screw it up kinda bad, the positions on the selector will be in the wrong spots (ie full speed in the middle). If you screw it up really bad the motor will spin in reverse. However I think it is hard to fully dicker up the job.
Surely dr google has a wiring diagram however.
At least it is not an elise, took me 2 full weekends to replace the resistors. It involves removing body panels and ALL of the AC system.
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84 930
18 Cayman GTS
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