Engine overheating

[Dick Osterhof]

I have a 2002 Allegro Bus with a Cummins 330 ISC. 78,000 miles on it. I purchased it used. I live in Ridgway, CO and as a result must go over several passes. The engine overheats, even with the outside air temp. at 45 degrees F. in second gear, at 2250 RPM,towing a GEO Tracker. What I have done so far is the caustic wash followed by the acid cleaning of the radiator. Have done a Simple Green cleaning of the radiator from the rear of the MH and the same for the aftercooler from under the bed. The "slobber tube" had been extended sometime before I purchased the MH. I found no traces of oil/dirt on the aftercooler. I am using Final Charge coolant. My next step is to replace the thermostat. The cooling fan looks to be too small and if I can find out what the fan diameter should be, I will measure it and replace it if not correct. Belts are new (I replaced them when I first found the overheating problem). Any suggestions for fixes I may have missed will be much appreciated.
Dick Osterhof (gdo@ouraynet.com)

[motojavaphil]

Originally Posted by Dick Osterhof

I have a 2002 Allegro Bus with a Cummins 330 ISC. 78,000 miles on it. I purchased it used. I live in Ridgway, CO and as a result must go over several passes. The engine overheats, even with the outside air temp. at 45 degrees F. in second gear, at 2250 RPM,towing a GEO Tracker. What I have done so far is the caustic wash followed by the acid cleaning of the radiator. Have done a Simple Green cleaning of the radiator from the rear of the MH and the same for the aftercooler from under the bed. The "slobber tube" had been extended sometime before I purchased the MH. I found no traces of oil/dirt on the aftercooler. I am using Final Charge coolant. My next step is to replace the thermostat. The cooling fan looks to be too small and if I can find out what the fan diameter should be, I will measure it and replace it if not correct. Belts are new (I replaced them when I first found the overheating problem). Any suggestions for fixes I may have missed will be much appreciated.
Dick Osterhof (gdo@ouraynet.com)

Hi Dick,

We have a 2000 Beaver with a 330 Cat. Had issues with overheating in severe conditions, 110 degrees going up hill with a toad. We did a number of things but ended up having the radiator pulled and cleaned. New coolant, belts and radiator cap. We had a collector placed on the end of the tube. The only thing not done was to replace the thermostat which seemed to be working OK. We have stayed in the normal range since with a high temp around 202 degrees. The transmission temps are also down and its fluid and filter has been changed. The entire back of our MH had to be removed to access the radiator. Hope this helps.
Moto