ken i think you cursed me. i was driving home last sunday in the all day snow/wind storm and had the plow off because i was driving around alot. the dam truck was frigid. i would not go over 150 or so unless i was climbing a hill, then it would fall. but the odd thing was i had almost no heat, it should have been luke warm for sure. come to find out, the drivers side temp actuator was sticking on the cold side of the swing. i had to take it from 60 to 90 a few times to get it back to hot, and now it sits on the 90 temp only. i guess its in order for replacement now. along with t-stats.