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Discussion Starter #1
hey guys...have a question

i have a stock pcmofnc transcooler on the truck now, stock cooler bypassed setup. i stopped at autozone earlier to pickup a fog light and noticed a small puddle under the front of my truck it was trans fluid...babied her home and pulled it apart to see that i'm leaking from the NPT fittings i believe they were 1/2"....looking to swap to a tru-cool 40k and just want to verify that before i swap the actual cooler units i should fill the the tru-cool with fluid first to prevent air entering into the system...thx for any help!
 

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Discussion Starter #2
any help here guys?
 

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TrailblazerSS
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I never had to fill a trans cooler before but I'm sure it will not hurt to do so.

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TrailblazerSS
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You wont need to fill the cooler. It flows back to the pan so you wont have to worry about running it dry.
 

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Discussion Starter #5
It won't introduce air into the system by doing this?

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TT AWD SS Pwrd Jeep
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If you ever saw how fast and how much flows out, that cooler will be full and all lines to the trans in like 2 seconds. There is a ton of air in the upper part of the trans (more than fluid) plus theres a vent at top. So any air bubbles just rise to the top. The pressure regulator while filling wont let presure drop. The pump is huge, plus your not driving it. Ive seen junkyard derby cars when they get a leek squirting 12ft still drive em til the pump dry / wont move. So no worries idling in the driveway bud! :)
 
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Discussion Starter #8
ty walter...that's the info i was looking for...appreciate the help guys
 

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TrailblazerSS
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Keeping the transmission fluid cool is a great insurance policy for long transmission life.
Depending on where you live (north or south) it is almost impossible to have too big of a cooler.

Also remember that the cooler lines also go the the radiator. In the south (where it seldom get below freezing) you can bypass the radiator and use only an external cooler.
The logic...the radiator is always in the range of 180-190 F, so the the fluid returning to the transmission will never be below that temp. This buys you two benefits...the radiator has less to cool, and the transmission fluid going back to the transmission will be cooler than it would be going thru the radiator.

See the chart attached
 

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