My car is still overheating on me, I can drive around town for quite a while without any issues, but as soon as I got on the highway up to 65 mph, the temp goes up and up...It's happened twice overheating now. I have so far pulled out the plugs and cranked to check for a possible headgasket issue, and no coolant came out any cylinder. I have replaced the thermostat, pressure cap, flushed the radiator, pretty much everything. The air damn on the bottom of the car is still there...I tried spinning the fan blades this a.m. cold, and they won't spin by hand at all...wondering if the fan clutch is possibly bad...