Originally Posted by semcha
I have an 1994 Itasca Suncruiser on a Ford 53 chassis. It has a stock transmission cooler. Does anyone have recommendations for a cooler fan for the transmission? Where do you connect the wires? Do you need to wire an on/off switch to the fan or do they come with a thermostat?
First of all, if you don't already have a transmission temp gauge, you need to fit one. It's easy to fit an electric gauge with the sensor in the pressure test port, and the gauge will fit neatly and inexpensively in the dashboard. I'm not sure if they tell anyone, but Winnebago has placed 2 holes for the nominal 2" gauge size in the metal bracket to the right of the main Ford gauge cluster. You just have to cut a hole in the black plastic covering, and there's your gauge mount. If you tilt your gauge pod all the way back, you'll see it. (Yes, I have a 1994 Brave).
Secondly, the Ford cooler actually is of adequate size, provided that air flows through it. However either they never told Winnebago to do this, or Winnebago couldn't be bothered, because usually all the air goes around it, some for the power steering cooler and not that much goes through the radiator either.
So the cheaper way to get proper cooling is to make the duct from the front cap that Winnebago should have fitted. I did this, and temps came way down.
There is still the 1% situation where this won't provide enough cooling, and that is when you come to a stop. Sometimes I come home after a trip towing a trailer and don't make it through my gate in one shot, so I leave the engine running, and get out and check. In this case my secondary inline thermostatic transmission cooler comes on for quite some time. I have this mounted out of the airflow, as otherwise it would provide too much cooling. This heat soak related temp rise can lead to blowing transmission fluid past the from seal. Apparently theseal can recover from this, but not very many times.