I'm trying to figure out if I have more than a thermostat problem. My truck would only get warm enough to defrost the windshied and make it bearable to drive without my hand's going numb. It was'nt cold air blowing out but it was'nt really that warm. I installed a new thermostat today and now it get's warm, but should'nt the air coming out be hot, to the point where you should have to turn it down before your face melt's? I bought the T-stat from a Dodge dealer, but it look's totally different than what came out. The part number on the reciept is 5015708AC. Does anyone know if this is right. The lower part has rubber going around the bottom part that sit's down in the opening. It's about 1 inch deep. This isn't the gasket, it's blow it and you can't see the spring on the inside. It seem's to be working fine, because my operating temp. is at 190 or slightly below. I think 188 is normal. The air is much warmer, I just figured there would be more "HOT" air. I did check the coolant after I drove it and it's full. Thank's for any input!