WHILE DRIVING DOWN THE HIGHWAY, WITH THE A/C RUNNING, ALL OF SUDDEN BLACK SMOKE STARTING POURING OUT OF THE HEATING VENTS, VEHICLE CAUGHT ON FIRE. AFTER FIVE OR TEN MINUTES, DRIVER RESTARTED ENGINE AND WAS ABLE TO DRIVE TRUCK HOME. DEALER FOUND LEAVES AND OTHER DEBRIS INSIDE THE BLOWER SYSTEM WHICH CAUSED THE PROBLEM. THE PROBLEM WAS CORRECTED AT OWNER'S EXPENSE. PLEASE PROVIDE ANY FURTHER INFORMATION. *AK