So what u are saying is when the key is turned off, the fan is still getting power, but a low amount, just enough to make it run in low speed. But when u turn off the fan, it won't come back on. But when the key is turned on, it works fine.
First thing is trace the power to where it's coming from. Get a tester with a light in it, and go to where normal power goes to the fan, when the key is on. Turn off the key, and see if the light stays on, I.E. the light goes dim, but stays on. I'm guessing that you'll find that the fan is still getting power, but a low amount. Let me know if u can trace this back to anything.
As For Chris, who knows if u really stumped him or anything.
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'84 mustang GT turbo
'85 LTD
'89 Camaro Irocz z28
'94 Lightning
'96 Trans am
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