Transmission not circulating fluid to cooler - Chevy and GMC Duramax Diesel Forum
Transmission Shop Discuss the Allison OEM, aftermarket, and the ZF-6.

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post #1 of 6 (permalink) Old 08-13-2019, 09:38 PM Thread Starter
 
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Transmission not circulating fluid to cooler

2001 LB7 transmission is getting hot 260 degrees. Air temp 95+ running empty. I drained trans fluid, new inner and spin on filter refilled with transynd. Trans is not over full. Installed new oversized PPE transmission cooler. I can place my fingers on both sides of steel lines on front trans cooler and both lines are cool to the touch. For some reason I am not getting fluid to circulate. Engine runs cool 190 degrees, truck is stock, transmission shifts fine. Trans temp verified hot using a inferred temp gun pointed at pan and spin on filter. What should I be looking at next? Thanks
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post #2 of 6 (permalink) Old 08-14-2019, 02:14 AM
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Fluid flow routing is;
trans to rad
rad to aux cooler out front
aux cooler back to trans

Remove the inlet line to the rad and inspect for debris at that connection.
When the innards start to go, debris will hit the narrows of that connection and pile up, restricting fluid flow....and you'll see excessive heat spikes.

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post #3 of 6 (permalink) Old 08-14-2019, 09:01 PM Thread Starter
 
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Quote:
Originally Posted by Hook'em_Horns! View Post

Remove the inlet line to the rad and inspect for debris at that connection.
When the innards start to go, debris will hit the narrows of that connection and pile up, restricting fluid flow....and you'll see excessive heat spikes.
I pulled the line off and found debris at the connection. Thank you for the tip! Now my question is how much life is left in this transmission if any? I am hopeful I can clean the cooler out and run it for awhile?
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post #4 of 6 (permalink) Old 08-15-2019, 09:00 AM
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Remove the inlet line to the rad and inspect for debris at that connection.


Dang Hooky!!!
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post #5 of 6 (permalink) Old 08-15-2019, 11:37 AM
 
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Did you pull the Radiator out to inspect the It ?

Driving through the foothills in central Cail empty, look at cts and tranny temp was 215. By the time I found a flat place to pull over temp was 223. (outside temp was 91)
I cleaned the stack (took the Rad and Intercooler out and sprayed them out) about 2k miles ago so thats clean. Sure wish I would of looked at the tranny radiator inlet now.

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post #6 of 6 (permalink) Old 08-15-2019, 12:23 PM
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I pulled the line off and found debris at the connection. Thank you for the tip! Now my question is how much life is left in this transmission if any? I am hopeful I can clean the cooler out and run it for awhile?
No way for someone to know how much might be in the transmission, so take the pan off, do the inspection of any debris, clean it thoroughly including the magnet, and change the spin on filter. You need to flush our yout trans fluid line from the trans to the radiator to the trans cooler and back to the trans with the proper flushing fluid (avoid pushing any debris back into the trans itself), such as Kooler Kleen. See here:

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