My problem turned out to be caused by a very small leak around the water pump. I started noticing a slight smell of anti-freeze around the front of my truck after driving which lead me to the cause of the problem. Also, as the coolant level was getting lower, the problem began to get a little worse. The heater began to blow out cold air while I was setting at traffic lights and when I was driving at slower speeds and not excelerating the engine. I replaced the water pump and flushed the cooling system to correct the problem. Now, I have heat to spare!
Last edited by relgibds; 12-31-2010 at 02:11 PM.