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You need to read the TM's, it covers this issue and has TS procedure.

yes, at least this piece of it...this part of the system either works or it don't, as pointed out, your system has failed in the disengaged mode, I had that on a truck, it was the TDM, but the water crossover temp switch can be bad as was pointed out, that's a simple one to test. Just unplug...

The drain back lines to R&R is a 15min job....as well, check the inlet on the bottle, I drill them out one over, this way they are clean and open. i had a customer truck that had this issue....both those lines and overflow tank were clogged with rust, casting sand and a clump of RTV. The lines...

Did you replace the thermostat? Did you replace the coolant bottle cap? Is your fan installed correctly? Meaning the blades are moving air in the correct direction, they can be installed backwards. Lastly, you very well have a blockage in the coolant system. I would remove the radiator and have...

Yes..TDM is the highest failure rate item in that system, then the Cadillac valve solenoid.

Oh...and the number one reason for hot running truck I find is a bad radiator cap. in order for the cooling system to work correclty, glycol requires it be pressureized to raise the boiling point, if the cap is let out pressure, the coolant cannot do its job, the cap is 15psi. the other issue is...

Ok folks...lots of misinformation going around. the cooling system on the hmmwv is simple, yet over engineered, like all things military these days. the HMMWV uses a hyd fan clutch, assuming everything is working the fan free wheels when cold, it is NOT locked, so it's not moving air, you will...