Driving the 300 TD today for about 125 miles. as we approached the destination, I noticed the heat was blowing cool air. made a stop at a food store, for about 15 minutes, and the heat came back. until about 15 minutes later inthe trip. finished the drive with little heat. Any Idea's ? I just replaced the thermostat, which helped a overheating problem. but now the car is running on the warm side as well or the gage was reading about 90 C. and the outside air temp was in the low teens. How do I test the water pump? It is not leaking, and the coolant is not low...???
Jason

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46 WDX Power Wagon

84 300TDT daily driver