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Do you mean, at what engine temp. does the electric fan start, if so, then it's around 200 f give or take. You can always jump the wire with a cold engine to see if the switch is good. The fan will start up when you ground the wire, if not, then start checking all the wire cnx.

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14y ago
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Q: What is the degree for my fan switch on 1990 Ford Tempo gl?
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