duelly5566 Posted June 9, 2013 Share Posted June 9, 2013 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. Quote Link to comment Share on other sites More sharing options...
staxx Posted June 9, 2013 Share Posted June 9, 2013 Check a/c high psi switch ,if a/c is showing ecu high psi it turns fan on . Also check for contaminated ecu connection like coolant in harness. Quote Link to comment Share on other sites More sharing options...
hatcity Posted June 10, 2013 Share Posted June 10, 2013 May be the clutch is shot. Is it locked up in the am?PIA to replace but easily do-able at home. Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment Share on other sites More sharing options...
rsb502 Posted June 21, 2013 Share Posted June 21, 2013 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. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
Mackmaster862 Posted July 18, 2013 Share Posted July 18, 2013 There is a plug for the fan switch on drivers side unplug it and jump it on the harness side and see if tge fan disengages if you have access to Mac III You can check switch status monitoring and see if ac pressure says on or off Quote Link to comment Share on other sites More sharing options...
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