When at low speeds and doing some work (pushing through snow drifts, maneuvering trailer in the yard, pulling out tree stumps, etc.) my truck starts to overheat pretty quickly. I also pulled up the P0480 code w/ my Smarty (Cooling fan 1 control circuit).
So, I did the trick where you cover up the condenser and turn on the AC and the fan does its job just fine. This being said, does anyone have any ideas as to what would be making this happen? Is there another way to check the fan clutch? I have an ohm meter, if that helps.
Thanks in advance.

 

Anyone have any ideas?

 

Is your radiator clogged with mud or dirt?

 

Nope, I checked. Also, this began a few months ago all of a sudden.

 

Ever figure it out? mine is doing similar now. even worse after I changed out the fan clutch

 

Sorry but no. I ended up having the cooling system flushed and replaced the fan clutch (wasn't necessary). I haven't had it overheat since however, my temp gauge will jump up to 200 degrees pretty quick, causing the fan clutch to lock up. Before this issue my coolant temp was always at 191 +/- 2 degrees. Good luck.

 

my NEW fan clutch wont engage at all. So if im in town in traffic, I over heat, highway is ok. Going to test old fan VS new one.

 

You may want to check the wiring that runs between the fan shroud and the radiator, near the bottom. I'm pretty sure that there was an issue with a wire rubbing through and grounding out but it may have just been the early 3rd gens. I would also make sure that the relay is functioning properly.

 

OHHHH. Forgot about the relay. Thanks. ill look at that next.

Wiring looks fine. Made sure I correctly routed the new wires. seen them get wrapped up in the fan before. Changed out a lot of these 3rd gen fan clutches.

 

Did you ever get it figured out?

 

not yet. been driving the jeep. currently rebuilding the front end on the dodge. I did inspect the wires and there appears to be some damage to them. Ill look further when time allows.

 

I would go ahead and replace thermostat from genos then make sure all the air gets burped out. I don't think fan is supposed to engage with out ac until 210-215.