I have a 2000 jimmy and the heater fan stopped working.for a couple of days it would not work right away but came on after a few minutes but now don't work at all. could it be a loose connection or would i need to replace the control unit?
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Re: heater fan not working
It could be a loose wire or the fan has gone bad...the blower fan is under the hood on the passenger side held in by three screws and a plug...jiggle the wires under the dash and see if it comes on again if not look for another blower motor
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Hello. First, it is probably that the clotch in the coolin fan isn't working. When the coolin fluid is warm, the temperatur put it in work, and the fan works rapidly, when the temperatur lows, the clotch loose the fan an is waiting the warm up again. But your Jimmy don't have the coolin fan in the principal belt, it have an electric coolin fan. In that case, your problen is for a low level of coolin water, or the relays of the electric fan don't work properly.
Finaly, my english isn't good, because I speak in spanish, but if my bad english solves your problem, i'm geting so well. I working every day in electronics cars, and that is the basic metod of analyse that I use.
Sounds like you need to replace blower motor speed cotroller, located underhood right rear of engine on A/C / Heater case on firewall, rectangular in shape. When fan stops working tap on controller, fan should come back on then you will know that is problem. Have seen this many times on this vehicle. Hope this helps, have a good one!
Left side of the dash, to the right of the IP fuse block. Its a 25 amp circuit breaker, an aluminum cased breaker.
CHECK FOR POWER ON THE SEAT SWITCH "A" TERMINAL AND GROUND ON THE "D" TERMINAL. IF YOU HAVE POWER AND GROUND THE SWITCH IS BAD.