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1986 944 AC/DEFOG Blows Fuse 17

Electrical

Vehicle Information: Model(924/944): 944; Year: 1986; Engine (type, size, modifications): 2.5 NA; Total Mileage: 105000;

Each time I activate either the Defog or AC button on the climate control fuse 17 almost immediately blows. This originally occurred quite spontaneously while driving to a club meeting. At first a replacement fuse would remain intact for a short time with the AC/DEFOG operating normally. After a few replacements however the blown fuses became almost instantaneous, as soon as either button was pressed. When the fuse blows there is no longer control of cabin temperature only full heat. The fan speed is controllable. I have checked the wiring diagrams cant seem to find fuse 17 or it's component connections to begin diagnostics.

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