Front Seat Power Adjust problems of the 2004 Chevrolet 1500

When I first purchased the truck, I noticed a week later that the driver's heated seat would not stay on, while depressing the button. It illuminated but went off as soon as I released it. Consequently, no heat to driver's seat. Passenger seat heated and still heats properly. I notified dealer, but did not dignose the problem. But it did not bother me. I figured it may work later. Not until July 2013 did I notice the power seat motor continued to run when I shut off engine. So I tap the latch on the side of the seat to listen for motor to quit. I thought it may be related to my 1st problem with the heated seat. I continue to drive this truck daily, has 153000 miles. Probably one the finest chevys I have owned. Thank you.