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4000 + Coupe GT
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That is your after-run fan system to reduce vapor lock.
Posted by: Avant-Rene (6321) on 2017-09-25 00:09:29
In Reply to: So I had posted about my radiator fan staying on awhile back... posted by Hoosierman on 2017-09-24 20:22:00

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My 87 5KS had a temperature switch mounted at the rear of the valve cover on the passenger side of the car. The temperature switch was mounted on a bracket with two wires attached to it.
If you disconnect one of the wires it should disable the after-run fan system. Make sure to put something over the contact you remove to keep it isolated.
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