This heat can be transferred to the engine coolant resulting in a potential boil over. At the same time, if the transmission is overworked, it might raise the operating temperature of the ATF to 250 degrees F or more. If the vehicle in question has a thermostat that opens at 195 degrees F, once warmed to operating temperature, the transmission cooler will have a tough time reducing the heat of the ATF below 195 degrees F. And at the same time, it too can influence the engine coolant temperature. A typical “in-the-rad” cooler will reduce the heat of the ATF but it’s also influenced by the engine coolant temperature. The built-in coolers that reside in the bottom of the radiator are marginal at best. Often, a transmission will die within a few thousand miles (or sooner) if subjected to 300-plus degree heat. Carbon forms in the oil and for all intents and purposes, the transmission is now junk. At approximately 315 degrees F, seals and clutches effectively burn out.At approximately 295 degrees F, transmission clutch plates begin to slip because the oil is breaking down further.The end results are internal and external leaks as the the seals lose their elasticity. At approximately 260 degrees F, internal transmission seals, which are often manufactured from a polyacrylate material, begin to harden.The result is the formation of varnish inside the transmission. At approximately 240 degrees F, important additives begin to cook in the automatic transmission fluid (ATF). ![]() The ideal operating temperature for automatic transmission fluid is somewhere between 175 and 225 degrees F. In any case, loads coupled with stop-and-go traffic increase the heat level in an automatic transmission. This is also true for trucks that haul heavy loads or tow trailers battling tough conditions such as long grades, high altitudes, or desert heat. Engine rpm is up across the board, and the automatic transmission builds heat. This is especially true in big-power, street-strip machines that combine lots of horsepower with a small torque converter and steep rear axle ratio. It’s no secret that heat kills automatic transmissions.
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