Ok, working on the 63 somemore. Have new heater core, and heater control valve working fine. 230 L6 engine, 4core radiator, 180thermostat. Engine warms up and then stays cool. The problem is the defrost runs cool also because of it. Its in the 30's here in the mornings and I would like the heater to be a little hotter. Can I go to a 195 thermostat and keep the engine a little warmer? What about putting something in front of half the radiator to shunt some of the cool air entering the engine bay?
