Engine Fan not working
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Joined: Oct 2005
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Engine Fan not working
While towing my trailer the engine fan does not come on when the engine starts to heat up. I have an Edge with Juice and this is where I am reading the temperature from as the factory gauge never moves as everyone already knows. It does push out a little water so I know that it is getting hot. I changed the Fan Clutch and the water temperature sending unitand this did not help. I spoke to Bill at Powerhungry and looked at the wiring diagram and I checked and it is getting the 12 volts to the fan from the PCM. When you speed up the engine the test light flickers and the then fan may come on for about 3 sec (once) and then that is it. I have read on here where you can not ground the plug to make the fan work and that the PCM controls the fan, no external relays, etc. The Edge shows a fan control circuit code once the engine gets over 200 degress, however if I take the Edge off the PCM does not pick up any codes. My thoughts are that the PCM is going bad but I was wondering if there is something else that might be causing this that I should before changing the PCM?
Thanks
Thanks
Hotshot
Joined: Dec 2003
Posts: 15,369
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From: Stuttgart, Ar
There are several things that happen to make the fan come on. My advice is to take it to a dealer you trust and have them put it on IDS and let them see what's going on. I've seen a LOT of fan wires break or get cut where they connect at the shroud, so that's something you might check. FWIW--pushing water doesn't necessarily mean getting hot. It could simply mean overfull or a bad cap. I doubt seriously you have a bad PCM.
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I have checked the wires at connector and I got 12 volts coming in and 12 volts flickering the test light at pin that is supposed to be the control wire. I also had a blow out on the left front a couple of years ago and I had never pulled anything heavy enough to make the truck get hot enough to push out the water until I bought my camper. Also using a A/C themometer I also shows that is if getting hot. With the Blow Out they changed the under hood wiring harneess and kept getting codes until Ii went and to the dealer and cleared tehm with the Edge. They would not remove the Edge so I was going to remove it and then instead I tried clearingthe codes and it did so I drove it home.
