WHILE DRIVING ON HIGHWAY AT 65 MPH OCCUPANTS STARTED SMELLING SMOKE THAT WAS COMING FROM THE FRONT LEFT SIDE OF THE DASHBOARD. WITHIN SECONDS OF PULLING OFF THE HIGHWAY VEHICLE CAUGHT ON FIRE. THE FIRE MARSHALL COULDN'T FIND THE CAUSE OF THE FIRE BECAUSE THE FRONT OF THE VAN WAS SEVERELY BURNT. *AK....*AK