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I have the 6.2 and don't have the part number. I went to autozone and got one for a 6.2 diesel chevy k2500, year, I think was 1985. The 1988 thermostatic was set for 195 degree and the 1985 one was set for 190 degree. Of course I wanted the lower temp.

Good new, replaced the friction pads in the fan and everything is now working. The old friction pad was half the size of the new ones. These were easier to install and only $24 compared to replacing the fan clutch at $250 bucks. Installed them and pulled the power on the timer controller...

My HMMWV heats up to 240 degrees and it stays there. The fan moves back and forth with the fan control module is unplugged but there is no change in the fan speed. I have checked about everything. Got the HWWMV a few months ago and replaced the anti freeze, thermostatic, checked the fan...

OK, I have read every post on HWWMV overheating problems and found that my fan clutch Hyd, TDU and Fan clutch work fine. The fan moves back and forth when the TDU is disconnected but no engagement of the fan. There is also on power loss so I know it must be slipping on the friction pads...