I continue to have a problem with overheating since I purchased my RV.The previous owner may have had the same problem since I found several bottles of antifreez. I asked him he denied it. I have had the radiator flushed, changed termostat,tersted fan clutch, water pump is working fine andhad the radiator taken out and dismentaled and cleaned.Hose and belts are in good working order.I continue to have the problem. Here is what happens. I drive 55 mph temperature is fine however once I increase speedtempeture starts to crip up. Temperature drops to normal asI decrease speed back to 55.Alsotemperaturerises as I climb hills. It overheats as well if I use the dash air. I am not towing. I seem to lack power as well to climb any hills. It does not overheat and can drive at any speed during cool weather however it still overheats as I climb hills specially on a long drive. Any ideas on what to do next. The rv is a 2000 Holiday Rambler Endeavor class A 36' ford V10 gas.