In preparation for my summer detail and service, I have decided to finally permanently install the radiator fan switch I wired last year. The switch manually triggers the high fans to help keep the car cool before it gets too hot, which is especially useful around town and in traffic. It is a simply modification, but it get can get complicated if like me you want to use OEM Porsche switches to trigger the fan. This is because Porsche used momentary switches that trigger action by relays, unlike a regular on/off switch that stays set to on or off, a momentary switch only sends a signal, it doesn't stay in the on or off position. Figuring out how to make this work sent me down several rabbit holes, and I have to thank Particlewave & Sandy who's posts helped me figure this out.
This is one I have been trying to figure out for years. It wasn't until I really took the time to get into the electronics of the 986, that I was finally able to figure it out. I won't be doing this mod anytime soon, so it has not been tested, but I wanted to share, since I find some of the other heated seat directions that use OEM switches to be very confusing. Since this is untested, use these instructions at your own discretion, I take no responsibility for whether this will work on not, but I think it should.
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