SATURDAY EVENING WE WERE EXISTING THE INTERSTATE WHEN I STARTED TO SMELL WHAT SEEMED LIKE A CHEMICAL SMELL. WE COULD NOT FIGURE OUT WHERE THIS SMELL WAS COMING FROM. AS WE PROCEEDED DOWN THE HIGHWAY, I STARTED TO GET WARM SO I TURNED OFF THE HEATED SEAT. WHEN WE ARRIVED AT OUR DESTINATION, I COULD STILL SMELL THE SOMETHING OUT OF THE NORMAL. I BEGIN TO LOOK ALL AROUND. SMELLING MY JACKET TO MAKE SURE THE KIDS DIDN'T SPILL SOMETHING ON IT, OR JUST TRY TO FIND WHERE THE SMELL WAS COMING FROM. FINALLY, I TURN AROUND AND REALIZE MY HEATED SEAT HAD CAUGHT FIRE. THANK GOD I HAD TURNED THE SEAT WARMER OFF MOMENTS EARLIER. LUCKY FOR ME, THE TRUCK DID NOT GO UP IN FLAMES. THE SEAT HAS A DEEP BURN HOLE AND MY JACKET (WHICH WAS BETWEEN THE SEAT AND MYSELF) HAS 2 BURNS IN IT. I WAS UNHARMED BUT IF IT WASN'T FOR ME TURNING THE SEAT OFF, I'M AFRAID OF WHAT MAY HAVE HAPPENED. OUR TRUCK IS STILL UNDER AN EXTENDED WARRANTY AND IS NOW AT THE DEALERSHIP TO BE REPAIRED. HOWEVER, I ASKED THE DEALERSHIP WHO IS TO REPORT SUCH THINGS? THEY EXPRESSED THAT THEY WERE NOT SURE, BUT THEY DO NOT. WE HAVE AN OPEN CASE NOW THROUGH THE DEALERSHIP AND WAITING FOR FURTHER INSTRUCTIONS.