Bypass radiator/tranny cooler combo?
Hi all. I have a 2005 Yukon XL Denali and wondered if anyone else has had success doing a radiator bypass for the tranny lines, and just using an Aux cooler on the front? Issue 1: From the factory...
Forum Discussion
ktmrfs wrote:
One thing that somewhat baffles me is using the radiator to warm AFT fluid at startup.
THE RADIATOR COOLER *NEVER* WARMS THE TRANSMISSION FLUID. NOT IN HOT WEATHER, AND CERTAINLY NOT IN COLD WEATHER. EVER.
ktmrfs wrote:
radiator doesn't really start getting warm until the engine is warm enough to open the thermostat. by then in most cases I'd guess the torque converter slip has already warmed up transmission fluid, especially in any stop and go driving. and in the meantime your running hot fluid through a cold radiator.
In cold weather the cold side of the radiator, where the transmission cooler is located, only gets a few degrees above ambient tamperature. The thermostat isn't open for a long time, so the coolant has a long dwell time in the radiator. That gives the cold air flowing through the radiator plenty of time to get the coolant almost down to ambient temperature before it gets to the trans cooler.
ktmrfs wrote:
Now maybe in extremely cold weather it will help keep the fluid warm enough once the thermostat opens,
No. See above.
