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great if you are towing. Not so great if you want to use the tailgate to climb in and out of the truck.

As mentioned before, you can swap it with one from a different cylinder to see if the problem moves with the injector, or stays in the cylinder. EDIT: Just to clarify, my intention with this comment is only to run the engine the bare minimum amount of time to determine if it is in fact the...

Next thing I would probably try is doing a cylinder compression test. It does require a diesel compression tester, and pulling glow plugs to do, but in theory will tell you if you have a valve issue

I wish I had one, instead I have the BEOD so none of the cool toys like the compressor.

as long as you are being consistent with how you are measuring the temps it doesn't matter as much exactly how you do it. There will be a little difference, but not a huge amount.

I managed to replace both sides of the fitting with standard hydraulic coupler by reaching through the fan blades. It took a while, and was uncomfortable, but doable.

As was mentioned, any electrical component can fail in either an energized or deenergized position. If it fails closed, then power will be flowing through it all the time. If it fails open, then no power will flow. Also to mention, the TDM can fail while energized, thus preventing the fan...

Place to hook/hang the microphone handset

If the thermoswitch fails and is energizing the circuit, then it disables the fan. When there is no power through the circuit, the fan is engaged. In other words, applying power through the switch turns ON the cadillac valve, which in turn disables engine power to the fan (fan still spinds...

700 give or take 25

I'd say get a cheap optical tachometer and figure out exactly how fast the idle actually is, before trying to "fix" a problem that might not even exist.

Sometimes you can use a laser thermometer to check the exhaust manifold right at each cylinder as it's running/warming up, to see if one or more is cooler than the others. Not sure if that works with these engines or not, as I mostly do it on smaller engines with tubular type exhausts.

Yes, the 2 wires going to the cadillac valve from the TDM. As mentioned above, doing the positive wire is better as it kills power to the valve. Normally, yes, most things that would cause a failure of the fan circuit will leave the cadillac valve without power, and therefore the fan engaged...

How some of us refer to LMTVs isn't suitable to be posted in a public forum.

Yes, you can wire in a switch. All you need to do is interrupt the power to the cadillac valve, so if you want to do it at the thermoswitch circuit, or right at the cadillac valve, it should work the same (though if the TDM fails it can prevent the fan from engaging, so at the cadillac valve...

if nothing else, not seeing any other vehicles on the road for 100 miles at a time was a bit of a novelty, and driving through whatever "national forest" that was that had scrub pines spaced 100 feet apart was amusing. I don't know if the scales still say no pickups, but not having to deal with...

My recommendation for going down to pick it up is drive through Nevada instead of commifornia. Commifornia laws are a lot stricter about when you're supposed to pull into weigh stations and whatnot. But then, I was driving an F450 with a gooseneck trailer, so legally I was required to stop at...

Verify with a laser thermometer that your gauge is reading accurately. The gauges are notorious for being innacurate. That being said, when my temps were above what they were supposed to be, it was a failed TDM (Time Delay Module)

it has to do with the tow rating of the HMMWVs. The older ones were rated for 3400 lbs towing; the newer ones or ones that got a reinfocement plate are rated for 4200 lbs towing. As other have said, the trailers themselves are identical but for data plate ratings.

https://www.ceniehoff.com/Documents/Ctrl_Hyperlink/TG17_uid252021123202.pdf