I HAVE A 2006 GMC ENVOY DENALI THAT CAUGHT FIRE THIS MORNING, IT WAS AN ELECTRICAL FIRE, CAUSED IN THE HVAC BLOWER CIRCUIT, THE CIRCUIT FUSE DID NOT BLOW, THE CABIN FILLED WITH SMOKE, AND AN OPEN FLAME WAS CREATED. I MANAGED TO PUT THE FIRE OUT, HOWEVER SOMEONE ELSE IN THIS SITUATION MIGHT NOT HAVE EVEN BEEN ABLE TO PULL OFF A BUSY HIGHWAY, LET ALONE EXTINGUISH THE FIRE AS IT WAS UNDER THE DASH BEHIND THE GLOVEBOX. THE SYMPTOMS BEFORE THE FIRE WERE AS FOLLOWS: 1)A FAINT BURNING ELECTRICS SMELL (ELECTRICAL SMOKE IS VERY DISTINCTIVE) 2)BLOWER QUIT RUNNING(WITHIN 30 SECONDS OF SMELL) 3)CABIN FILLED WITH SMOKE (WITHIN 1 MINUTE OF SMELL) TO THE POINT I COULD NOT SEE OUT THE WINDSHIELD 4)OPEN FLAME WAS PRESENT UNDER DASH (WITHIN 2 MINUTES OF SMELL) THE VEHICLE WAS IN MOTION, 50MPH, HEATING SYSTEM WAS RUNNING, OUTSIDE TEMPERATURE 5* FAHRENHEIT. THIS APPEARS TO BE A COMMON FAILURE POINT AS THERE ARE MULTIPLE REPAIR KITS AVAILABLE WITH NEW WIRING CONNECTORS TO REPLACE DAMAGED ONES WHEN REPLACING SPEED RESISTOR THERE WERE NO PREVIOUS ISSUES WITH THE HVAC BLOWER MOTOR SYSTEM