One problem related to defogger has been reported for the 2000 Chevrolet Silverado. The most recently reported issues are listed below.
The heater does not distribute adequate amounts of heat into the passenger's footwell. With the heater at max. Temp and airflow and the flow all directed to the floor, the driver was baking but the passenger's feet needed a blanket wrapped around them to keep them somewhat comfortable with outside temperatures in the the 12 degree area. This went on from colorado to tennessee and back over christmas. This is ridiculous. The dealer contacted gm's tech. Support, the truck was checked; "the heater is performing to specs. "!!!! now I'm told to keep working with the dealer. What am I supposed to keep working with since they've been told by gm that everything is ok? gm's customer assistance notes that there is a gm "poor heater performance review" currently going on within gm but offers no other hope of a solution. This is very frustrating and real cold on long trips when I should be able to get comfortable. Please light a fire under gm since I haven't been able to.