• Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!

  • Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.

M1097 6.5L 4 speed Thermostat - fan - issue question....

Retiredwarhorses

Well-known member
Steel Soldiers Supporter
4,392
4,173
113
Location
Brentwood, Calif
If the fan is on, it’s almost impossible for it to go to 240…IMO, your fan is not engaged and you think it is.
you cant test If the fan is engaged and disengaged without leaving the driveway, while driving, you can hear the differences between engaged and disengaged, when engage, it’s like reentry of the space shuttle.
And don’t let it go over 240! Pull over and unplug the TDM to make the fan run all the time, let her cool before you make the truck back home.
 

4x4nutz

Active member
Steel Soldiers Supporter
283
117
43
Location
Mico, Texas
Try to narrow it down to coolant flow or air flow. Thermostat stuck closed or partially closed? Radiator clogged internally? Or dirty externally, inhibiting airflow? Just spitballing.
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?
 

4x4nutz

Active member
Steel Soldiers Supporter
283
117
43
Location
Mico, Texas
If the fan is on, it’s almost impossible for it to go to 240…IMO, your fan is not engaged and you think it is.
you cant test If the fan is engaged and disengaged without leaving the driveway, while driving, you can hear the differences between engaged and disengaged, when engage, it’s like reentry of the space shuttle.
And don’t let it go over 240! Pull over and unplug the TDM to make the fan run all the time, let her cool before you make the truck back home.
I could hear the fan come on.
 

Autonomy_Lost

Well-known member
684
1,531
93
Location
Pennsylvania
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?
You'll get mixed opinions on this. But I think running without a thermostat for a short period of time for troubleshooting purposes is fine.

Heck, I ran a beater vehicle for almost a year with no thermostat and straight water 😆
 

Coug

Well-known member
Steel Soldiers Supporter
2,965
4,339
113
Location
Olympia/WA
Have you verified any of these temps using a laser thermometer? These are notorious for the gauges to be inaccurate, or wiring issues with high resistance causing incorrect readings.
 

Autonomy_Lost

Well-known member
684
1,531
93
Location
Pennsylvania
Have you verified any of these temps using a laser thermometer? These are notorious for the gauges to be inaccurate, or wiring issues with high resistance causing incorrect readings.
I was thinking this too, but he said he had coolant boiling out of his overflow cap, so...
 

Coug

Well-known member
Steel Soldiers Supporter
2,965
4,339
113
Location
Olympia/WA
I was thinking this too, but he said he had coolant boiling out of his overflow cap, so...
Checking multiple spots and the radiator hoses would be a good indication if the thermostat is opening properly.
I've also seen what people thought was overheating/boiling coolant was actually blown head gasket putting combustion gasses/pressure into the cooling system.
 

4x4nutz

Active member
Steel Soldiers Supporter
283
117
43
Location
Mico, Texas
I was thinking this too, but he said he had coolant boiling out of his overflow cap, so...
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.
 

4x4nutz

Active member
Steel Soldiers Supporter
283
117
43
Location
Mico, Texas
Checking multiple spots and the radiator hoses would be a good indication if the thermostat is opening properly.
I've also seen what people thought was overheating/boiling coolant was actually blown head gasket putting combustion gasses/pressure into the cooling system.
I was thinking blown head gasket too...will check the oil tomorrow to see if I have water in it.
 

4x4nutz

Active member
Steel Soldiers Supporter
283
117
43
Location
Mico, Texas
Leaking from behind the fan shroud.....and of course the leak stops when the motor is turned off.IMG-6342.jpg
 

4x4nutz

Active member
Steel Soldiers Supporter
283
117
43
Location
Mico, Texas
Checking multiple spots and the radiator hoses would be a good indication if the thermostat is opening properly.
I've also seen what people thought was overheating/boiling coolant was actually blown head gasket putting combustion gasses/pressure into the cooling system.
No water in oil...with the photo of it leaking coolant from around the fan, I guess the pump is leaking and the wind from fan is pulling coolant into the area around the shroud...pulling off the side panels to get a better look. But then again, there seems to be a good circulation going to and from the reservoir so maybe the leak isn't from the pump.
 

Mogman

Moderator
Staff member
Moderator
Steel Soldiers Supporter
6,887
9,540
113
Location
Papalote, TX
That is the correct fan, would not have been the first time one showed up with the wrong fan.
 

4x4nutz

Active member
Steel Soldiers Supporter
283
117
43
Location
Mico, Texas
After pulling the thermostat out and running without one it ran fine. After 5 miles temp was around 190, 10 miles 210 and fan came on and went off as needed. I am considering the upgraded cooling kit. Any thoughts? Also, THANKS EVERYONE who had something to say about this issue. I can now move onto the turbos...lolIMG-6339.jpg
 
Last edited:

Mogman

Moderator
Staff member
Moderator
Steel Soldiers Supporter
6,887
9,540
113
Location
Papalote, TX
After pulling the thermostat out and running without one it ran fine. After 5 miles temp was around 190, 10 miles 210 and fan came on and went off as needed. I am considering the upgraded cooling kit. Any thoughts? Also, THANKS EVERYONE who had something to say about this issue. I can not move onto the turbos...lolView attachment 890479
HOKUM
 
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks