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cooling fan bad?

Last post 05-11-2009, 3:34 AM by allhappy. 4 replies.
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  •  03-26-2007, 10:21 AM 5225

    cooling fan bad?

    I am trying to find out if the cooling fan is bad on a 1994 seville sts.  Can I just check the DC power going to the fan?  Where does the fan get its voltage from, is it from a sensor, micro processor.  How can I isolate and troubleshoot this problem.  Is there is any free electrical diagrams I can look at to troubleshoot with?  Thanks for your help.

     

    keywords: cadillac, cadillac sts, caddy sts

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  •  04-03-2007, 10:41 PM 6239 in reply to 5225

    Re: cooling fan bad?

    Hi,  I have a similiar problem on my Malibu.  I have unplugged the cooling fan wires, just use a screwdriver on the retaining clip, and I ran a wire from the battery to the connection.  This caused the other fan to operate.  So I know the fan is good.  I know the electrical cooling fans are controlled by two mini buss in the engine compartment fuse box.  I believe the temperature sensor sends a low voltage signal to the buss which trips the relay controlling the 12 volts to the fan.  I have no schematic.  I am not sure if it is only one sensor for temp gauge and cooling fan or seperate.  I have to got my own sensor unplugged and use a jumper wire between the two wires, which I hope will send the signal to the mini busses, I have two fans, If the fans don't work than the mini buss is bad.  Since I know the fans work becuase I powered them up from jumpers to the battery.  I hope I gave you some useful info.  Sorry I cannot be more specific.   Best of luck in your troubleshooting.   Bryan

     

    keywords: cadillac, cadillac sts, caddy sts

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  •  02-18-2008, 1:38 AM 31063 in reply to 5225

    Re: cooling fan bad?

    Some cooling fans also have relays under the hood on either fender well, fire wall and/or front cowling by radiator. Sensor wiring may also be bad from heat or oil saturation on older cars causing them to short out.
  •  04-27-2009, 1:48 AM 34020 in reply to 5225

    Re: cooling fan bad?

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