Thread: Installing a trany cooler.

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The biggest reason for the heat exchangers in the radiators is to heat the fluid in the winter like you're needing and describing. The other main reason is a secondary heat transfer in case there is a lack of air flow. LIke a traffic jamb. The biggest issue with a transmission during towing is heat. If you utilize the heat exchanger in the radiator, your trans fluid will always be the temp of your engine coolant and then ran through your external cooler and on some vehicles the temp coming out of the external cooler still exceeds what some trans builders want. I know people's opinion on here varies on this, but we've built and worked on many, many high performance diesel trucks that haul a lot and we've installed a lot of transmissions. We've never had any come back with the heat exchangers removed. The best thing that works for trucks in both climates, is putting a junction valve in the cooler lines so you can shut off the heat exchanger in the summer. It is a little more work but it gets the trans fluid temp down to where builders want it. Most of the major builders in the diesel world never want to see your trans fluid above 180*.