lenore Posted January 7, 2005 Posted January 7, 2005 I read the discussion on temps for engine and that is why the transmission hang in gear longer when cold. Does that mean if I add a Transmission cooler to my RX300 AWD that its temp is also monitored? Or would it be bad to relocate the transmission cooler in the wheel well to the front of the radiator? I added one years ago to another car and it worked alright. Would the addition cooler help on the design flaws in the RX300 AWD and possibly prolong the fluid from getting burnt and black?
wwest Posted January 7, 2005 Posted January 7, 2005 If, as I firmly suspect, the burnt fluid is the result of the transmission clutches not being fully engaged as the engine rev rise, then no amount of additional cooling will help since the source of the heating is localized to/at the clutch frictional surfaces. Like you, I was seriously considering adding additional cooling capability in the form of an electric fan to force more airflow through the auxilary cooler, but after I concluded that the problem is really that the transmission is not yet in the proper gear, or not fully in the proper gear, I abandoned the effort.
VGR Posted January 7, 2005 Posted January 7, 2005 On the Toyota Motorhome forum some owners have found it useful to install a transmission fluid temperature gauge. That way owners begin to recognize driving situations and habits that tend to cause the transmission fluid temperatures to soar and change habits as necessary. The shifting behavior of the transmission when cold is controlled by the coolant temperature, not the transmission fluid temperature. A simple way to avoid future transmission trouble is just change the fluid every 10,000 miles. It's as easy as changing the engine oil. Also, avoid driving situations that can cause the transmission fluid temperature to soar like getting stuck for along time in city traffic.
ColinBarber Posted January 7, 2005 Posted January 7, 2005 Anybody got any pictures of the oil cooler? I wonder if the European models have a larger cooler due to the higher speeds and harder driving styles. Although the UK only has a fraction of RXs on the road compared to the US I have not heard of a single transmission failure and I would guess not a single vehicle has had it's fluid changed as it's never scheduled to be changed. Maybe the lower air temperatures in the UK help?
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