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I have a 2009 Forest River Berkshire Class A diesel pusher with a 6.7L Cummins that keeps overheating. In the past month I have: First, Had the rear radiator blown out with air and then pressure washed. Lots of black filthy water came out. Still overheating. Then: 1. Had the Turbo replaced ($3400 rebuilt part-if you get one BE SURE it comes with the actuator) and the exhaust fixed where it had come loose and had it re-milled to fit better. $2800 labor. The tech showed me the turbo and it was definitely jammed up and not able to spin freely. Drove away, still overheating. Returned and then: 2. Had thermostat replaced $551 Drove away, still overheating, took it back third time and then: 3. Had a re-gen done on the catalytic converter 4. Replaced the air filter - it was filthy and jammed up with dirt Did all that at a place called Ross Point Truck Repair in Post Falls, ID. Drove away, still overheating. SPENT 4 WEEKS THERE!!! STILL NOT FIXED!!! 5. Had the inner cooler or CAC sprayed out with water Took it to Western States in Spokane WA and they hooked it to the computer and said it was not showing any codes. If I downshift all the way to 3rd, 2nd or 1st on my Allison transmission, and get the RPM's up to like 2700-3000, it still gets hot but doesn't overheat. Of course, I can only go like 30-45mph. Doing lots of mountain driving in the next week. My wife and I travel for work, so if we are stuck somewhere not moving we are losing lots of money. A few folks have suggested the water pump. Another guy said maybe it's a sensor, but it mainly overheats on big hills. ALTHOUGH, it has overheated on flat ground towing the car about 15 minutes in to the trip. Our manufacturer says we should only tow 5000 lbs, our car is 6000, every mechanic I have talked to says the Cummins 6.7L should tow 10,000 lbs with no issues. We have had this rig since Oct 2017 and towed the car at least 7000 miles with no issues. It's not losing any water when it overheats. Engine oil level looks good. Transmission fluid is clear, full, and does not smell burnt. ANY IDEAS????

Happy owners of this , new to us, 2011 Georgetown by Forest River... Purchased in June of 2017...I guess we got lucky and haven't had any problems other than the seat covers starting to delaminate. We have bunch of trips under our belts already and will be headed out full-time in July 2018 when I retire !! Just received our FMCA placards in the mail and will install when the cover comes off after this winter!