Some Over Heating / Trans & Engine

[harv12]

We have a '07 Winnebago with a 400 HP Cummings Engine and a Allison 3000 MH Automatic Transmission. We have the Cummings 400 HP engine number CUM ISL03 with the Allison 3000 MH automatic transmission.

We noticed recently that the transmission fluid temperature and coolant temperature both were rising while we were on any substantial grade. It never got too hot, but we would pull over and it would cool down quickly while at idle.

The transmission temperature would go up from about 180* to 205* on a grade {I can see that through the info panel on the dash} the coolant temperature which usually reads about 1/2 on the dash scale would go up to between 3/4 and the Red hot indicator. I haven't checked it through the info panel yet.

Again, the only time this has been issue is recently when we've been going up a significant grade for more than a few minutes.

I checked all the obvious and just changed all the caps on the coolant reservoir.

If anyone has experienced similar issues please let us know.

Thanks

[stuhly]

Radiator probably needs a good cleaning. Most likely plugged with road grime and blowby oil.

[mikelm48]

Have you had your radiator drained, cleaned and refilled? I was having cooling issues on my 05 ISC, had the radiator serviced and new coolant. It made a huge difference in my temps when climbing hills. I am thired owner on my coach and not sure it had be changed previously.

[harv12]

I have checked the radiator for blockages & dirt as best I could visually with a light and looked clean. I haven't had the radiator cleaned or flushed, but we're the second owners of the coach and it only had 26K miles on it when we purchased it. It may still need it.
Is this something I can do myself?

Thanks for the input!

[Harry B]

The ISL400 Models have a side radiator, wich ussually does have a problem with getting clogged.
Might check the hydraulic fan speed (cold vs hot engine), to make shure the controller is working properly.