No Heat While Driving
I have a 06 F350, no mods, does not puke coolant, degas bottle is good. It has been pretty cold lately and driving on the highway I have a little to no head but under any acceleration I get instant heat. In the city there is no issue and I do not have any issue at idle either. Only when I'm driving on the highway. I do not have a winter-front or anything covering the rad. Could it be the heater valve or thermostat? Would pulling the vacuum line off the valve do anything to help? Any info would be much appreciated.