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1991 911 Rear Heater Blower

Electrical and Electronic

Vehicle Information: Model: 911 C2; Year: 1991; Body Type: Coupe; Total Mileage: 76,000;

The rear heater blower in my 91'' 911 runs once the key has been turned to accessory and continues to run even after starting until you pull the fuse. My mechanic has narrowed it down to a temperature control sensor but he is unsure where this is located. I subscribe to an online diagnostic and repair service and my mechanic was able to sort the electrical out from the electrical schematic but it doesn''t show where the temp control sensor is located. Any suggestions on how to proceed?

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