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Message: [QUOTE="Mark Kovalsky, post: 421276, member: 1654"] The converter is left unlocked when the trans is cold because the control system is unstable and the unlocked converter helps warm the engine and trans faster. The radiator NEVER warms the engine. NEVER. I have tested this from -40°F to +115°F ambient temperatures. I measured the ATF temperature in and out of the radiator and the coolant temperature inside the radiator near the trans cooler. The engine coolant was ALWAYS colder than the ATF. ALWAYS. Not sometimes, ALWAYS. The cooler is in the tank where the coolant has already passed through the radiator and been cooled. The engine thermostat doesn't have much effect on this temperature. When it is cold outside the coolant around the transmission cooler is very close to ambient temperature. It's a transmission COOLER, not a warmer. [/QUOTE]

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