OWNER WAS DRIVING VOLKSWAGEN AND NOTICED SPARKS COMING FROM THE GLOVEBOX AREA. HE PULLED OVER, OPENED THE GLOVEBOX, BUT SAW ONLY SMOKE. HE THEN OPENED THE HOOD AND OBSERVED FLAMES ON THE LEFT SIDE OF THE BULKHEAD/FIREWALL. FIRE BURNED THROUGHOUT THE PASSENGER COMPARTMENT, THE FRONT UNDERCARRIAGE, AND PART OF THE ENGINE COMPARTMENT. CAUSE UNDETERMINED. *NM