I just swapped my heater core, and I am not getting hot air. With the heat all the way on, the air is luke warm at best (in 20 degree weather). No fog or leaking in car, but no heat eithert. I searched this and came up with nothing. IS there some kind of flow restrictor, or heater valve between the pump, heater core, and intake? What could be the problem. Oh yeah, water is at exactly 195 degrees. THanks