Compression Ignition Addict
Join Date: Feb 2009
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1, a tranny tech told me that the ATF cycles through the radiator for cooling as well as the oil cooler itself. He said that if the tube inside the radiator collapses (as they do with age) it restricts flow and the tranny heats up...check to see how free the fluid flows through the rad...and get a laser temp gauge, check the line temps before and after the rad. Tech said to look for 40* cooling diff between in and out, as taken 6-8" from the rad.
2, on my 2000, there's a valve that closes in cold weather to heat the atf up faster by shunting the fluid back into the tranny rather than letting it go to the coolers. If it malfunctions, it causes the tranny to overheat in no time flat. It's cheap to replace, like 60 bucks. I'd change it if your truck has it, cheap insurance.
2012 F250 With 9'6" Fisher Xtreme V plow.