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I am pretty much in the same boat as Itrpd. I've replaced the thermostat, the thermostatic switch, and blew 90 psi into the line from the Cadillac valve to the fan. The fan moved when blowing the air into the line after about 15 minutes of doing that. However it is now not moving very much at...

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Gentlemen, we have "leaf blower" engagement. Today I removed the line from the Cadillac valve and blew air through the line to engage the fan. It took quite a while and a lot of blowing to get the fan to move back and forth with regularity. I also lightly rapped on the clutch with a rubber...

I found the correct, made in the USA, thermostat at a local auto parts store for the 6.2 L. It is a Stant part number 13479.

Yes I am new to the HMMWV. Six months ago I discovered GovPlanet and didn't own any HMMWVs.....Now I own two.....:mrgreen: . I am grateful for everyone's advice, especially yours and Retiredwarhorses. I have already learned a lot from all of you guys on this and other threads. Duly noted...

Thank you for the link to the troubleshooting manual. I did not have that one and have already printed it and completed the troubleshooting outlined in the cooling section. I started the truck and let it idle in the driveway. It only took about 5 minutes before it was over 220 degrees. The...

Haha, no, definitely not seeing nor hearing the leaf blower effect. I assume that my next step is to determine if the fan engages when the engine is hot, e.g., over 220 F. If it isn't engaged but does if I unplug the TDM, the TDM is faulty. If it is engaged when hot, the next option is...

Today I unplugged my TDM and the fan did engage. It didn't appear to move a full 1/4" but it did move forward. While it did engage it didn't sound like it had any effect on engine speed nor did it blow off my hat. I've read others here state that that you need to hold your cover when it...

Today I drove mine about 10 miles and this is the gauge reading, pretty close to 240 F with an ambient air temperature of over 100 this afternoon. I lifted the hood when I got home and the fan was running. After reading the similar overheating thread and reading the cooling troubleshooting...

The fan does come on so that is working. It makes me feel better to hear that 220 is normal. I thought when it reached that temp it was on the way to overheating. If the fan is engaging can one assume that the TDM is operating correctly? Thanks again for the education, it is much appreciated.

I am having similar high temp issues with my 2003 M1045 A2 Slant Back. I just took possession of the vehicle about 3 weeks ago from GovPlanet and have only driven it about 20 miles. The engine temp goes up to about 240 F within 5 minutes of driving. I am in Texas south of Houston and the air...