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The fan will normally turn on when either the coolant temperature is above a preset limit OR the air conditioner is on. If the fan is NOT turning on when the temperature is up, check the temperature sensor. Yes one of the temp sensors is probably bad The one at the back of the head that has a black and yellow wire is usuallt the fault It mayy be leaking slightly and corroded the harness terminals Either way change that sensor It's under 20$ from the dealer

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Q: What would cause the cooling fan on a 1994 SC2 to not turn on by itself but it turns on with the AC?
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