I have a 95 thunderbird with full PI swap and 180* t-stat in it. The engine does not get above 1/4 on temp gauge when driving down the road in winter and blows cool air. If i let it sit for awile it warms up but when I start driving dow the road it cools back down. Cooling system works great in the summer when i was autocrossing it. It also has a new radiator and heater core to. It also did this when I had the stock motor in it but it did get warmer due to the 195 t-stat but still in the winter did not blow that hot of air.