I have a 2009 1/2 ton Suburban with 4 wheel drive. It has the tow package and the transmission cooler. What should I see on operating temperatures? I am seeing 150 to 170 driving the freeway but when driving into the mountains I have seen it go as high as 235 (this is with just the vehilce and no trailer or heavy load). Seems hot considering I have the factory cooler. Is this normal?
