SOURCE: cooling fan not working
The fans only run when the engine reaches approxminatly 235 degrees F. on the guage that is near the end of scale just before guage show "HOT" I don't think you have a problem, allot of folks out there don't know about this.
SOURCE: 2003 Chevy Impala, running hot. Changed fan shroud
Would turn the key on no need to start it and unplug the ect engine coolant temp sensor. If fans come on then suspect a faulty etc which may not turn on the engine light. Which engine is in the vehicle so I can help locate the ect which is usually by the thermostat housing.
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I take it your talking about the radiator fan? What switch did you change?
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