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Yesterday we verified the temp when it was around 180. It corresponded with what the gauge said (180), so when it got hot today, we did not verify again as we know the gauge is working.

The temp was right on the money yesterday when we checked it against the temp gauge.

In good shape.

I could hear the fan come on.

Looks like I'm getting good flow in the reservoir. No debris between radiators. Would it be a mistake to pull the thermostat out and run it without one just to check if there's any difference?

So after replacing the thermostatic switch, after driving 3 miles the temp went all the way up to 240+ with fan on? The coolant reservoir cap vented a bunch of coolant and I am back to square one...the humvee is overheating for some other reasons other than the switch, caddilac valve, and TDM.

Way ahead of you...lol

Replaced thermostatic switch...old one looks questionable. Will test her out once the wife leaves for the liquor store...lol

Replaced the TDM. At this point, the temp comes up to around 195 while regular driving in just about 5 minutes from cold (driving between 20 and 55MPH) and the fan comes on. It stays on and temp climbs to around 215 and does not go any higher. Fan seems to keep temp from rising any further, but...

Dude ...your like a brain scientist! Thank you!

Which should I start with...time delay module? Attempting to complete this humvee by Monday for Warrior's Heart in Bandera.

I understand that. That's what I was asking. Moving on to the thremostatic switch now that controls the fan clutch as per RETIREDWARHORSE.Thank you.

Engine temp 195 to 205. The coolant sending unit came off one of my other humvees...not chinese. We have not replaced the thermostat. We were inquiring about whether or not a stuck open thermostat would cause the clutch fan to remain on, and then we were asking about part numbers for a...

1996 M1097 runs great (we had previously flushed the radiator, added new coolant, and replaced the coolant temp sending unit), but after driving for just three miles (in 50 degree weather), fan came on and then did not shut off for the rest of the 7 mile trip. Later that day we ran it again and...

Aggie Maroon...battle colors...lol

Just the perfect ride in the Texas Hill Country...Thanx again.

HELL YEAH! I replaced the hidden fuse, hooked up the power wire (it had been cut and completely taped off) to the 12 volt source and this little unit shifted like a champ. MUCHO thanx to y'all for the help.

My friend is on his way with a meter so we can get all this business straight.

Yup! I had no idea. The fuse I have looks like toast, so I am going to make one using a 15 amp fuse. Thanx for the pic brother!

Will check. Thank you brother!