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Humvee cooling issue

juanprado

juanprado

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If you had blow by into the water, you would overheat quickly even idling from my rebuilt engine sales rep days in another lifetime.....

You would also have bubbles with the cap off watching the circulation.
 
Retiredwarhorses

Retiredwarhorses

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twisted60 said:
I did remove the thermostat but did not drive it. I have tried the original thermostat (it was bad), tried civi thermostat that I tested before install (later removed), currently installed is an OEM thermostat.
I am leaning toward new radiator, can I have a leaking head gasket and it not show up with combustion block test ? The blue liquid doesn’t change color.
Thanks
Click to expand...
i use a stant pressure system tester, there are a few tests to perform, one is when you Start the truck and see how long it takes to build pressure in the overflow tank, the other is too pump 15psi into the system and see how long It takes to leak down And lastly testing the radiator cap pressure, I’ve used this tool successfully for over 20yrs.
 
twisted60

twisted60

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DING DING DING Action wins with the wrong fan comment. I compared my 1152 6.5 TD to my 998 6.5 NA my 998 and my 1152 have the same fan installed. The 1152 has the 6.5 TD with surp belt and if I understand correctly the water pump turns the other way so fan blades should be opposite. The USMC did some work on her before she was sent to DMRO, I assume they broke some fan blades and replaced the fan with out checking part number.
I ordered the correct fan per the TM so when it arrives I'll install and hopefully that cures my overheating issue.

Thanks everyone for chiming in to help me get to the bottom of this issue.
jEt6PhRyR1ec8WGQJBYipw.jpg
My 998
eQZnnI3UQd+hcwnvPmZ+Gg.jpgORSLCwUwTW6HPHMMTVuHsA.jpg
My 1152 (2 pics)

I plan on fixing the shroud soon, guess Private Snuffy leaned on wrong part.
 
frank8003

frank8003

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twisted60 said:
DING DING DING Action wins with the wrong fan comment. I compared my 1152 6.5 TD to my 998 6.5 NA my 998 and my 1152 have the same fan installed. The 1152 has the 6.5 TD with surp belt and if I understand correctly the water pump turns the other way so fan blades should be opposite. The USMC did some work on her before she was sent to DMRO, I assume they broke some fan blades and replaced the fan with out checking part number.
I ordered the correct fan per the TM so when it arrives I'll install and hopefully that cures my overheating issue.

Thanks everyone for chiming in to help me get to the bottom of this issue.
View attachment 852069
My 998
View attachment 852070View attachment 852071
My 1152 (2 pics)

I plan on fixing the shroud soon, guess Private Snuffy leaned on wrong part.
Click to expand...
Different fans opposite driving rotation That "fit" different engines -problem found. If that turns out to be true than that information should be put into a sticky or a place where that information can be found.
 
twisted60

twisted60

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frank8003 said:
Different fans opposite driving rotation That "fit" different engines -problem found. If that turns out to be true than that information should be put into a sticky or a place where that information can be found.
Click to expand...
I'll update post when fan arrives and if that did in fact solve the issue. Ordered OEM fan from Midwest, very helpful company with fast shipping.
 
frank8003

frank8003

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twisted60 said:
Yes, V belts on my 998
Click to expand...

Which water-pump part number do I need?

Little back story. I've got a coolant leak on my truck that I suspect is coming from around the water pump. Its not much, mostly few drops noticed at a time, doesn't steam out or get all over the place. Don't see any signs of it anywhere else (in the oil, on the exhaust, things like that) but...
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That does mean a different fan?

and just for even more questions/answers go to

G503 Military Vehicle Message Forums - Login

forums.g503.com
 

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dhaumann69166

dhaumann69166

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My Humvee will sit and idle or even go on short trips without over heating but a few miles down the road it starts climbing in temp. Turns out I had a bad connection on my TDM the way disengaging the fan clutch when I was moving.
 
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