Hummer H3 Transmission Cooler Install | Enhanced Performance - Hayden 678 Installed!

Hummer H3 Transmission Cooler Hayden 678 Installed!
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[@KushielFotia]

Thanks for sharing. Gives me a general idea for when I do mine. I'm hoping it removes some additional heat from the main radiator and lowers engine temperatures as well as for transmission longevity. Have you seen any effect on engine temps so far?

[@BoltsNBoost]

I have a brand new thermostat and coolant. It has never been above half on my truck... I'd say a very small amount on the hwy to the cooler side