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fan clutch always on

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2000 vision fan clutch is always on I checked for voltage and ground constant 12 volts to air switch no ground jump to ground fan stops and then the volt symbol on dash comes on un hook jumper and fan comes on and volt symbol goes out need some help please.

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  • 2 weeks later...

clutch is working if it disengages and the ecm is turning it on if you get an electrical mallfunction light when you use a jumper, like STAXX said sounds like a psi switch, could also be a temp sender I just dont know enough about that system to lead you into the right spot, on older trucks there were two one would go bad and turn the fan on the other was for the guage so it showed ok.

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  • 4 weeks later...

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