2004 Chevrolet Colorado wipers, windshield & visibility problems

Noticed an 'off' odor from vehicle after it sat overnight throughout the fall. As vehicle is typically operated with windows down during the temparate months I thought nothing of it. Once the weather changed and vehicle was being operated with the windows up I started to feel ill with respiratory distress / tighness in the chest and throat each time I operated the vehicle. When retreiving an item from the floor I noticed a very distinct strong odor of mildew. I felt the carpets and they were damp to the touch.

2004 chevy colorado zq8 HVAC blower harness and resistor. Part was replaced at approximately 15,000 miles under mfg warranty with identical parts. Again out of warranty with no new revised parts at 45,000 and now again at 77,000 miles. Harness and resistor failure had gotten so hot each time that it had melted the harness to the resistor. Possible fire hazard, with severely burnt wires.