William Conner

I'm towing a 24ft camping trailer; a Passport 197RB made by Keystone. When pulling long grades, most recently on I77 heading toward Boone, NC; the engine overheats to the mark between 210 and 260. As soon as the road levels off, the engine temperature drops back to the normal 210 degrees. This only happens when towing our camper. I've had the vehicle back to the dealer service 2x, but have not totally resolved the problem. They changed the radiator this last visit, indicating that a leak was found during a pressure test. No problems were found on the first visit, saying it was OK for the engine to run a little hot. Looking for any help (suggestions) for resolving this issue. Thanks much !!!