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Message: [QUOTE="Mark Kovalsky, post: 1401295, member: 1654"] Yes, I did this on a 6.0L as well as many other vehicles. It was my job at Ford to do this. I've tested in air temps from as cold as -40°F to as hot as +121°F Depending on the test the truck started cold, or it started hot. I've done it both ways. I've tested idling, city cycle driving, highway driving, and anything in between. Depending on the test coolant temps were anywhere from -40°F to just below boilover. That's why every test had hundreds of thermocouples to measure everything going on. I had thermocouples inside the radiator around the trans cooler. I had thermocouples measuring the ATF temp in and out of the radiator cooler and the air to oil cooler. I also measured air temperature in and out of the radiator, around the engine, and around the transmission. Before I started measuring this I didn't think this was how it worked, either. I was surprised that the radiator never warmed the trans fluid, but it does not. I have measured this on many different types of vehicles in many, many different conditions. The only time it is even close is at startup when the coolant and the ATF are at the same temperature. Once the engine starts the ATF starts to flow. It warms slowly, but the coolant around the radiator trans cooler doesn't warm at all, because the thermostat is closed. When the thermostat finally opens it dumps 200°F (more or less) coolant into the radiator. It doesn't stay open for long because the engine sucks ambient temp coolant in through the lower hose, causing the thermostat to close quickly. By the time this hot coolant gets the transmission radiator cooler it's back to near ambient. Remember, I had thermocouples in the radiator to measure this, I'm not guessing. If you want to see actual data you'll have to go to Ford. I didn't own that data and I only took my memory of it when I left Ford. [/QUOTE]