What's goin down guys.... Today I put in a new thermostat in my 1994 Pontiac grand Prix 3.4 liter. So I put everything back on the car n put in new antifreeze. Then I started my car up to let it warm up n after 15 to 20 mins. The engine was warm but there was cold air blowing out of the vents. Can u guys help me out to figure out what's going on with my car