VEHICLE WAS IN MOTION, DRIVING UPHILL. NEEDLE ON THERMOSTAT GAUGE SUDDENLY PERKED REALLY FAST TOWARDS HOT. ENGINE LIGHT WENT ON. VEHICLE WAS DRIVEN TO SIDE OF ROAD AND ENGINE WAS SHUT OFF. SMOKE WAS COMING OUT OF FRONT OF ENGINE. DRIVER STEPPED OUT OF CAR. WHILE INSPECTING THE FRONT OF THE CAR, THE DRIVER SAW FLICKERING FLAMES UNDER RIGHT SIDE OF ENGINE (AS SEEN FROM INSIDE). DRIVER TOOK SLEEPING CHILD OUT OF CAR SEAT AND STEPPED AWAY FROM CAR. CAR WAS ENGULFED IN FIRE WITHIN MINUTES AND COMPLETELY BURNT UP.