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The above fix posted by 86 911 Targa is the same fix I did on my 87' and it works perfect. I did not use the diode nor pin 10 wiring. If I pull up my levers the engine blower works and to activate the footwells I merely pull levers further up. Also, when I run my A/C I activate the engine blower which provides more air flow thru the engine lid grill and drops my engine temp when idling. I suggest doing this fix and then look for a used Heater relay which can be picked up for 70-100 bucks as a backup or should you decide to sell the car.
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