Hey all. We have a 1992 Mazda protoge with 168,000 miles. It has been a wonderfull car 'bought used' with normal repairs done mainly myself. My latest problem is this. The car runs and the engine heats up with in a few miles like it should even in 20* weather. The temp gauge shows it is at normal temp, but the heater does not put out heat like it should. I have removed the heater core lines and back flushed it twice, still not hot like it used to. I can also smell a hot radiater smell inside the car at a stop sometimes. No water leaking in the floorboard or any noticable fluid loss at the radiator. The oil in the engine is clean as well. I am stumped. I am going to flush and drain the radiator when it gets warmer but that does not help my wife and kids in the cold now. I did 'pay' to have a new water pump and timing belt put on it 8 months ago but that was back in the spring. Any ideas will be greatly appeciated , Thanks in advance, Columbia,SC.