Cadillac Valve & TDM Keeps Burning Out

[TOBASH]

stay away from electric fans…it’s been proven for 20yrs they do not work on this truck.
I lost count on the number of trucks I’ve removed these stupid cooling fans guys stick on the radiator stack, they block airflow, the best fan is the OEM fan.

I'm looking for electric fan CLUTCH, not electric fan Steve.

EDIT- I just saw the prior posts and I realized you were not referring to me Steve when you were talking about electric fans

 

[tgejesse]

Following. About to drop 300$ on hoses for this dumb fan set up. Would totally go with @Retiredwarhorses solution.
Have an 1165a1

 

[Hummer Guy]

Following. About to drop 300$ on hoses for this dumb fan set up. Would totally go with @Retiredwarhorses solution.
Have an 1165a1

Yea, next time my cadillac fail, I'm going with that solution, but are you guys all comfortable with 220 degrees operating temperature? Even with my aluminum radiator and paradox cooling kit, my temperature stay at 220 degrees. One thing though, the fan barely turns on with these upgrades, I just always found it strange that these trucks run that hot with the fan system being completely operable. Back when my cadillac was broke and my fan stayed on always, my truck would run at 180-190 degrees which seems like a good temperature range.

 

[TOBASH]

Your dash thermostat and accurate temperatures are two separate things. A laser thermometer is more accurate.

If you upgrade to a hydrostatic clutch, you can bend the spring to modify it to turn in at lower temps.
You should also clean your stack and use a 180 degree radiator valve. Clean your radiator if you suspect it is old and full of crud.

 

[Retiredwarhorses]

Yea, next time my cadillac fail, I'm going with that solution, but are you guys all comfortable with 220 degrees operating temperature? Even with my aluminum radiator and paradox cooling kit, my temperature stay at 220 degrees. One thing though, the fan barely turns on with these upgrades, I just always found it strange that these trucks run that hot with the fan system being completely operable. Back when my cadillac was broke and my fan stayed on always, my truck would run at 180-190 degrees which seems like a good temperature range.

Oh, you mean it’s operating as designed…I have had Diesel engine trucks all my life, my 2020 Duramax runs 220 all day under any load.
You need to learn how diesel engines work before you and anyone decide to try and make them run at 180 operating temp.

 

[Hummer Guy]

Your dash thermostat and accurate temperatures are two separate things. A laser thermometer is more accurate.

If you upgrade to a hydrostatic clutch, you can bend the spring to modify it to turn in at lower temps.
You should also clean your stack and use a 180 degree radiator valve. Clean your radiator if you suspect it is old and full of crud.

Make sense, these gauges are known to be off, I have to tap my oil gauge for it to show the correct pressure. The cooling stack is almost brand new, I replaced it about 6 months ago

 

[Hummer Guy]

Oh, you mean it’s operating as designed…I have had Diesel engine trucks all my life, my 2020 Duramax runs 220 all day under any load.
You need to learn how diesel engines work before you and anyone decide to try and make them run at 180 operating temp.

I get that on the newer Duramax since their thermostat open up at around 210-220 degrees, the thermostat on the 6.5s open up at 195 and still climb all the way up to 220 degrees, even with normal driving in fairly cool weather. I've heard quite a lot of chevy truck users with the 6.5 say it runs best at 180-195.

I've also heard from multiple people saying the 6.5 in the Humvee only run at such a hot temperature to burn other fuel sources easier

 

[87cr250r]

I am an operator of marine diesel engines. I have made some observations with regards to temperatures. It's generally understood that higher engine temperatures do result in lower cylinder wear rates. I believe the wear is a result of corrosion due to condensation in the crankcase.

With the advent of aftercooling, diesel engines sometimes require low temperature cooling circuits. Our big engines have coolers dedicated to aftercooling and jacket water. Our small engines take a few different approaches.

Caterpillar wants us to run sea water cooling so they can use it for their aftercooler. We despise Caterpillar small engines (7-9 liters) for this and a few other reasons.

John Deere runs their thermostats at 160°F. This isn't ideal for the cylinders, out engines suffer from light loading as well. They run flawlessly but also offset their fuel burn with lube consumption.


As an operator, despite the wide range of temperatures manufacturers set for their engines, I've never really noticed any differences.

 

[TOBASH]

Oh, you mean it’s operating as designed…I have had Diesel engine trucks all my life, my 2020 Duramax runs 220 all day under any load.
You need to learn how diesel engines work before you and anyone decide to try and make them run at 180 operating temp.

I get that on the newer Duramax since their thermostat open up at around 210-220 degrees, the thermostat on the 6.5s open up at 195 and still climb all the way up to 220 degrees, even with normal driving in fairly cool weather. I've heard quite a lot of chevy truck users with the 6.5 say it runs best at 180-195.

I've also heard from multiple people saying the 6.5 in the Humvee only run at such a hot temperature to burn other fuel sources easier

I’ve read these truck are more efficient about 210 BUT I prefer not cracking heads and blocks.

As usual RWH/ Steve is absolutely correct.

 

[Hummer Guy]

Is it normal for the fan to partially engage? I notice with this new cadillac valve, my fan partially engages around 225-230 and shuts off at around 190. My other cadillac valve had always fully engaged the fan, This was with my old radiator though, the temp usually would never drop and stayed at 220 even with the fan engaged, maybe that one stayed fully engaged because the old radiator couldn't keep up?

 

[Coug]

Is it normal for the fan to partially engage? I notice with this new cadillac valve, my fan partially engages around 225-230 and shuts off at around 190. My other cadillac valve had always fully engaged the fan, This was with my old radiator though, the temp usually would never drop and stayed at 220 even with the fan engaged, maybe that one stayed fully engaged because the old radiator couldn't keep up?

Fan should be either all or nothing. Comes on, cools engine, turns off.
The newer fans (A2 variant or newer) are redesigned to be quieter than A0/A1 trucks, so if it's just the sound you're basing the "partial engagement" on, I wouldn't worry.
Sounds like your old cooling system just wasn't keeping up.

 

[Mogman]

Is it normal for the fan to partially engage? I notice with this new cadillac valve, my fan partially engages around 225-230 and shuts off at around 190. My other cadillac valve had always fully engaged the fan, This was with my old radiator though, the temp usually would never drop and stayed at 220 even with the fan engaged, maybe that one stayed fully engaged because the old radiator couldn't keep up?

The fan is ether on or off, no "partial" mode, how do you know it is partially engaging? If it is the fan clutch will soon burn up.

 

[Hummer Guy]

The fan is ether on or off, no "partial" mode, how do you know it is partially engaging? If it is the fan clutch will soon burn up.

It seemed like the fan was a lot quiet than what it was, but my idiotic self forgot that I had sealed off the doors with weatherstripping last week which is why it sound much quiet in the cab

 

[Hummer Guy]

Fan back stuck on again

 

[CaptainChaos]

get rid of the entire setup and go with the viscous fan clutch assy, we are doing them now in the shop, no more Cadillac valve or hydraulic fan clutch.

I'm interested in getting rid of my hydraulic clutch. Can you direct me to the shop you have mentioned?

 

[TNDRIVER]

I'm interested in getting rid of my hydraulic clutch. Can you direct me to the shop you have mentioned?

PM sent.