Hi all. My wife's 72 tii runs hot above 50 mph and when sitting in traffic. Close to the red. I'm going to try the easy fix of a 71 degree thermo first. Hopefully that will cool things down. But here's the thing, the air from the heater never gets hot or even warm. Any thoughts? ALSO, what speed can I cruise at once I get it running cooler. Even at 60 mph car soon runs very hot, just short of the red. Thanks so much