Thread: How to: '00-'03 Grand Prix standalone transmission fluid cooler

I ran the hot fluid into the cooler, then into the stock cooler then into the trans

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Originally Posted by ADecker

I ran the hot fluid into the cooler, then into the stock cooler then into the trans

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From what I've read, that's backwards. You are reheating the fluid at that point. It should go Trans->stock cooler->external cooler->Trans. That way the coolest fluid goes back into the transmission.

This is a super clean install though. If I lived back in a warmer climate I'd do this. I still might do this, only add in a thermostat...

Originally Posted by ADecker

I ran the hot fluid into the cooler, then into the stock cooler then into the trans

Originally Posted by Booba5185

From what I've read, that's backwards. You are reheating the fluid at that point. It should go Trans->stock cooler->external cooler->Trans. That way the coolest fluid goes back into the transmission.

I've been doing a lot of research on this topic. I found this info and thought it might be usefull......

"Because heat always seeks to flow from the hotter to cooler surface, on a street car we can help stabilize both trans and engine temps by referencing one fluid to the other: Retain the original in-radiator trans cooler in addition to using an auxiliary cooler. In this scenario, whichever substance is hotter (the trans fluid or the engine coolant) will transfer some of its heat to the cooler medium. The trans usually heats up faster than the engine. So, if driving in severely cold weather, to speed engine warm-up, consider running the trans fluid out of the trans, into the engine radiator’s internal trans cooler, out of the internal trans cooler to the external auxiliary cooler, and back to the trans. In the event the engine gets hot before the trans, plumb the trans first to the external cooler and then into the radiator cooler. And if you drive only in warm summer months and find that both engine and trans temperatures are on the edge, plumb the radiator and trans cooler separately and in parallel.

Full article here: http://www.hotrod.com/how-to/additio...s-and-answers/