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Sounds like you have similar situation as I have. I have a 86 late model with a 2-wire thermoswitch and I couldn't find the 3rd wire needed for a real late model thermoswitch. I had the electrical drawings somewhere, I'll check where I saved them when I get home. I ended up wiring a switch inside the cabin to trigger the highspeed fan as the thermoswitch only triggered the low speed. Check clarks-garage.com for some trouble shooting.
But I thought that all 944's came with twin fans? Only on the earlier model one fan will only start if the thermoswitch closes and energizes the cooling fan relay. Can you take a pic of your cars fan and thermoswitch?
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