I have a 1990 Wagoneer Limited with a cooling problem. Seems to run cool around town, but at highway speeds, it runs hotter than I think it should. Around 210 around town, but on the highway around 220-235. Ive replaced everything I can think of, new t-stat, new water pump, new fan clutch, hoses, etc. Im at a loss. Its a 1990 Wagoneer Limited, mostly stock, 3 inch lift, 31's, everything else is stock, gearing, etc. Any advice offered would be great. Thanks...