That looks like the transmission cooler I installed in our MC-8 (same location). We re-routed the transmission cooler hoses so the transmission fluid goes to the this cooler first, through the OEM cooler, and then returns to the transmission. Since doing this, all temperatures (water, oil, and transmission fluid) run about 10-15 degrees cooler. And that is without turning on the fan. We have not been in any mountains yet see give it a real test.
Do you pull outside air in, or push inside air out with the fan? Jack
Jack - It pulls outside air into the engine bay. I get to test it all the time as I have a first gear pull to get to my house
(I can take it at second if I make more of a run at it). At slow speeds it seems to work OK too. Pulling the hill out of Las Vegas in mild temps (80's) it really helped too.
I wonder about exhusting the air (rather the little fan working against air pressure to draw in and exhaust air) when the load is high. Pulling the hills in Northern California and Southern Oregon it helps as well. These are steep and long, with my bus in 2nd gear most of the time, RPM's up so lots of air coming through the blowers. I can still see an impact on the dash gage when I switch on the fan under these conditions, so it must work OK. When I get current projects done, I will start thinking about better ducting to see if I can get more benefit.
I think I would like to come up with some louvers or vents that can be opened or closed near the top of the engine doors to exhaust the blower heat directly out of the back of the bus without passing it through the engine bay. Seems like it would help in hot weather. I would like to be able to close these in cooler weather to keep the temps in the warmer range. Not sure if it will have any effect if I do it. Opinions anyone?
Craig - MC7 Oregon