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Old 05-11-2010, 12:53 AM   #1 (permalink)
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Overheat - Fan clutch does not engage

Hey guys,

I have a problem with my fan clutch. I noticed that when my truck is not moving or when it is driving up the hill my fan clutch does not turn on. The temperature gets up to around 220 and higher. The only time fan clutch turns on is when the Air Conditioning gets turned on, therefore my truck does not gets overheated. I did not change any parts yet, i am not sure what to change. How can I fix this problem? What should I check for?
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Old 05-11-2010, 05:07 AM   #2 (permalink)
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There is a temperature sensor that is supposed to tell the fan when to come on. I'm not sure exactly where it is though.
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Old 05-11-2010, 03:32 PM   #3 (permalink)
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Just replaced temperature sensor, but the problem is not fixed.
When I started truck today , fan turned on for 10 minutes and then turned off. When the temperature got above 220 the fan never turned on again.
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Old 05-11-2010, 03:38 PM   #4 (permalink)
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when the motor is off but warm, the fan should spin with some resistance. If it spins freely than you FC is done.
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Old 05-11-2010, 03:47 PM   #5 (permalink)
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Yes . It spins with resistance.
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Old 05-11-2010, 08:12 PM   #6 (permalink)
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You may need to check for TSBs that may apply to your issue. Check Fritz's Dodge Ram Tech. He lists every TSB for our trucks by year on his site....

http://dodgeram.info/tsb/2003-index.htm
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Old 06-04-2010, 07:23 PM   #7 (permalink)
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Ok I changed my clutch fan still has the sAme problem. What's next. The fan turns on and off with a/c but never kicks on and roars like it used to when it gets hot going down the road.
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Old 06-04-2010, 09:07 PM   #8 (permalink)
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okay Iam not sure but I would check to make sure pcm is sending the signal to clutch because you say it works when a/c is switched on.
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Old 06-04-2010, 09:57 PM   #9 (permalink)
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I don't think I have ever heard the fan running other then for the A/C on my truck, even when pulling my camper up hills in the SC summer heat. The ecm can engage the fan at lower percentages for engine cooling and you won't hear it. The only time you hear it is at 100%.
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Old 06-04-2010, 10:14 PM   #10 (permalink)
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Well i used to never got over 200 on the stock Gage. now going up small hills with the camper in it ( put it in today) It goes about 1/8 inch above 200 (220 maybe) I drove down from Alaska to Utah and going up hills even in the dead of winter i would here it kick on. Now the only time i really here it while driving is when i first start up and leave the house. I also downloaded the computer and the fan clutch fault is gone now so i guess that is good.

Is there a service manual online somewhere to get a schematic?
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Old 06-09-2010, 08:34 PM   #11 (permalink)
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temp sensor

Where is the temp sensor you replaced? I'm having fan clutch issues and just replaced the fan clutch with a new one but still no luck.
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Old 06-09-2010, 08:42 PM   #12 (permalink)
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please post something up when you all find out what it is, my fan clutch is acting up itself...
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