Your right Ivan,
Porsche started adding the blower fuse on April 23, 1986.
Anyone without the fuse should add one.
Quote:
Originally Posted by HaroldMHedge
Here's the requested TSB and an additional one on repairing the fans.
TSB 8704 Fuses for Additional Heater Fans
TSB 8706 Repairing Additional Fans

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From
Blower Motors Photos Heaters / AC