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1989 gmc s15 automatic ---Radiator fan / cooling fan constantly runs

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When I start the truck ...it immediately starts to run and than runs until I turn off...I believe it should come on only when temp. is high enough or ac is on..

Before this happened I was trying to fix ac but now ac connected is not connected any more but still fan starts immediately I turn on the truck..

temperature sensor or anything else?



Where is temperature sensor located that turns on that radiator fan?

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