AT APPROXIMATELY 2:15 I PARKED MY 1998 MERCURY MOUNTAINEER ON THE STREET IN FRONT OF MY HOUSE. AT APPROXIMATELY 2:30 I HEARD THE VEHICLE THEFT ALARM GO OFF. WHEN I WENT TO SHUT OFF ALARM, I SAW FLAMES COMING FROM THE RIGHT FRONT WHEEL WELL. (I COULD NOT SEE WHAT WAS HAPPENING ON THE OTHER SIDE OF VEHICLE) I WENT BACK INTO MY HOUSE TO FETCH MY DRY CHEM FIRE EXTINGUISHER. I WENT BACK TO THE CAR AND ATTEMPTED TO EXTINGUISH THE FIRE. WHEN I WAS UNSUCCESSFUL, I HAD MY SON CALL 911 FOR FIRE DEPARTMENT ASSISTANCE. A FIRE TRUCK RESPONDED WITHIN 3-5 MINUTES AT WHICH TIME THE WHOLE FRONT END OF THE VEHICLE WAS ENGULFED IN FLAMES. THE FIRE DEPARTMENT PUT THE FIRE OUT WITHIN 5 MINUTES. UPON INSPECTION, I NOTICED THAT THE WHOLE MOTOR COMPARTMANT WAS CONSUMED BY THE BLAZE AND THE FIRE HAD STARTED TO BURN THE DASH AND INTERIOR OF THE VEHICLE. THE VEHICLE APPEARS TO BE A TOTAL LOSS.