Hummer H3 For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine.

Transmission Temp 235F, where should I start?

Old Aug 10, 2023 | 02:22 PM
  #21  
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They will be OK for a while.

I would go 1/2" wide band clamps, two (double) over each barb fitting, going in opposite directions once you are satisfied you are going with that set up without changes. If you are going to change it up, then it don't matter.
 
Old Aug 10, 2023 | 03:24 PM
  #22  
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Originally Posted by Doc Olds
They will be OK for a while.
"A penny saved..." could backfire!




 
Old Aug 10, 2023 | 09:42 PM
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Results are in, 205-208F max engine coolant temp, 165-170F max transmission temp. Took the same route as before, 105F ambient temp AC full blast... Before I was running 220-225F engine coolant temp, 230-235F transmission temp.

My transmission was running way too warm causing the engine to run warm as well. Installing the bypass transmission cooler solved both issues.

​​Thank you all for your valuable input specially @Doc Olds and @hummerz I'd buy you guys a beer 🍻

Lol now I need to get better hose clamps. I just used the stuff that came with the cooler.
 

Last edited by MadDogBimmer89; Aug 10, 2023 at 09:49 PM.
Old Aug 11, 2023 | 12:42 AM
  #24  
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What about ear clamps? Here's a photo I did on my BMW oil cooler lines with some AN fittings.


Twin turbo magic
 
Old Aug 11, 2023 | 08:03 AM
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Originally Posted by MadDogBimmer89
What about ear clamps?
Oetiker

 
Old Aug 14, 2023 | 08:48 PM
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Originally Posted by hummerz
WEAK CLAMPS! I wouldn't trust those tiny gear clamps to hold my pants up & DEFINITEY NOT to hold 300+PSI!

Question. Are the numbers listed in this chart run through the lines? Or, is the pressure regulated before it goes into the radiator/cooler?

​​​

From this weekend, first time on the dirt road 👍


 

Last edited by MadDogBimmer89; Aug 15, 2023 at 12:17 AM.
Old Aug 15, 2023 | 08:41 AM
  #27  
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Happy Transmission Temps mean Happy Coolant Temps.

Good job riding the problem into the ground to an excellent result.
 
Old Aug 16, 2023 | 03:21 PM
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Originally Posted by Doc Olds
Happy Transmission Temps mean Happy Coolant Temps.

Good job riding the problem into the ground to an excellent result.
Thanks Doc, driving problems into the ground is what I do, won't rest until it's solved.

Do you by chance know if the transmission pressure is regulated? The numbers Hummerz shared are quite high 300+ psi running through the lines is a bit unsettling. Or is that the internal pressure?
 
Old Aug 16, 2023 | 07:08 PM
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Originally Posted by MadDogBimmer89
Question. Are the numbers listed in this chart run through the lines? Or, is the pressure regulated before it goes into the radiator/cooler?


Line pressure is the same. Btw, driving> manual shift to 1, will produce 300psi+ @Redline.
 
Old Aug 16, 2023 | 07:18 PM
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Originally Posted by hummerz
Line pressure is the same. Btw, driving> manual shift to 1, will produce 300psi+ @Redline.
OOF Ok, once I go back in to install the bypass I will get some ear hose clamps on there just to be safe. Although at this point I am thinking just running a hard line.
 

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