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I have a 2001 American Eagle 40 foot with a Cummins 350 that weights 33k. I tow a Grand Cherokee that weighs 8k. I am told that I need and estimated 10 horse for every 10k of weight so I am somewhat under powered. I have had my radiator fins pressure cleaned, the cooling system flushed and pressure tested and the fans tested to make sure they are kicking on and running at the appropriate time/temp. Additionally I have changed out the thermostat to make sure it is not sticking or causing flow issues. On hill climbs in Colorado, Arizona and Nevada I will constantly overheat and have to pull over to cool. I use the Alison mode to run between 2200 and 2400rpm during climbs to increase circulation but eventually my alarm kicks off. I never heat to critical levels but alarms start at about 190 or 200, normal running temp for this coach is 160-170. My temp gauge goes up to 240 but I never heat more than 200-210 but I don't like running that hot and the alarm is distracting. Besides the climbs, I saw last week this heating on flats in Nevada. Of course the outside temp was 100 but I would not have expected overheating on flats. Now in the fall and winter months most climbs and all flats don't cause overheating due to the cooler air. The engine is well kept, has about 75k on it and fluid and filters are constantly maintained. Now what is very strange is that I lose about 1/3 gallon of coolant every 400-500 miles. It does not drip out as I have zero leaks under the coach. It is not making it's way into the engine as engine fluids show absolutely no signs of moisture. I have had the system pressure tested 3 times to make sure I don't have a high temp hiss/steam leak and the reservoir tubes and cap are not leaking. My questions are as follows. 1. Does this just sound like a HP issue and that the 350 just can't handle the 41k pounds of coach and toad? 2. Any ideas where the coolant may be going? Some have suggested it may be leaking into the turbo but that makes no sense to me 3. Does anyone know of an after market turbo monitor gauge so I can monitor that with RPM? 4. Are there any after market cooling systems that can be put on to help with the overheating or do I just need to buy a new coach with a larger engine? Thanks for reading!

I have a 2008 Tiffin Phaeton with the Cummins ISC 360 HP engine. As I was approaching my present destination, a "check engine, coolant warning" amber light came on. It went on and off as I traveled the last 10 miles or so to my destination. On checking the coolant levels after the engine had cooled, I found that the "surge" tank was filled to the proper level between min and max. Also, while the warning light was coming on the temperature gauge and the oil pressure gauge remained at normal levels. A couple of years ago, I had the cooling system flushed and refreshed at a freightliner service facility. Any ideas about why I am getting these warning lights will be appreciated.

I just purchased a 2006 Zephyr. The engine is leaking coolant. I suspect it's blowing through the overflow/radiator cap. I changed the cap and it improved, but still causes a mist behind the coach. Took it to Cummins MidSouth and the replaced the EGR cooler, and pressure tested it and its not loosing pressure after an overnight test. Just picked it up from Cummins, and still a mist behind the coach with small signs of droplets on the rear of the coach and drip lines on the coach-wide mud flap. Any suggestions? BTW, odometer shows only 36,000 miles.