Engine won't come up to temp
My 99 Dodge Ram is not heating up. It will get as hot as about 150, but never any higher. I just replaced the thermostat with a 195 degree Stant, and radiator cap to no avail. The water pump is fairly new, installed last summer. I let it run for quite a while, and the upper radiator hose gets warm, almost hot as it should, but the lower is still cold. When the upper gets hot, the temp gauge is still reading about 150. I don't see any circulation in the radiator either.