STARTED THE TRUCK TO WARM UP, AS TEMPETURE WAS 17 DEG. F.. WENT INSIDE TO LOCK UP HOUSE AND WHEN I CAME OUT THERE WAS SMOKE COMING OUT OF DOORS. UPON OPENING, THE CAB WAS FILLED WITH BLACK SMOKE AND THERE WAS A FLAMING MASS ON PASSINGER SIDE FLOOR ON A FLOOR MAT I HAD PURCHASED FOR TRUCK. I PULLED MAT OUT WITH MELTING PILE OF PLASTIC AND PUT FIRE OUT WITH SNOW ON GROUND. HAD TO MAKE ARRANGEMENTS FOR SOMEONE TO PICK US UP AND GET HOME BECAUSE I HAD MY 8YR. OLD GRANDDAUGHTER WITH ME AND SHE HAD TO ATTEND SCHOOL THE NEXT DAY AND WE WERE 275 MILES FROM OUR HOME. THIS HAPPENED APRIL 3RD 2016 IN MILLPORT, PA. 16748 AND MY RESIDENCE IS IVYLAND, PA. 18974. RENTED A CAR AT HOME 4/4/16 AND GOT ION TOUCH WITH FORD DEALERSHIP IN COUDERSPORT, PA. 16915, KIGHTLINGER MOTORS. TRUCK WASTO BE READY 4/13 AND I WAS GOING TO RETURN RENTAL CAR TO MANSFIELD, PA. LOCATION AND HAD A RIDE TO COUDERSPORT TO PICK UP TRUCK. RECEIVED A CALL THURSDAY 4/14 THAT TRUCK WOULDN'T BE READY UNTIL POSSIBLY 4/20/16. THE VEHICLE WAS STANTIONARY WARMING UP WITH FAN ON LOW WHEN FIRE STARTED AND HAD BEEN WARMING UP (NO PUN INTENDED) LESS THAN 5 MINUTES AS WE WERE READY TO LEAVE. TRUCK IS A COMPANY VEHICLE.