NHTSA Complaint #10626947 — 2004 GMC ENVOY XL 370

WHILE DRIVING WITH PASSENGERS IN CAR, SMOKE STARTED TO COME FROM THE FLOOR AREA IN THE BACK SEAT AREA. IMMEDIATELY DROVE CAR TO A CAR SERVICE SHOP TO HAVE INSPECTED TO DETERMINE WHERE SMOKE WAS COMING FROM. THE CAR TECHNICIAN WAS UNABLE TO DETERMINE WHERE THE SMOKE WAS COMING FROM OTHER THAN FROM THE FLOOR AREA IN THE BACK. HAVE BEEN REPLACING A RADIATOR BECAUSE THE ENGINE KEEPS RUNNING HOT. HAD A NEW RADIATOR INSTALLED. THEN BEGAN TO HAVE PROBLEMS WITH THE ANTI-FREEZE DISAPPEARING FROM THE RADIATOR AND THE RESERVOIR. TOOK CAR IN AND HAD A PRESSURE TEST PERFORMED. THE MECHANIC WAS KNOWLEDGEABLE OF THE PROBLEM AND IDENTIFIED THAT THE ANTI-FREEZE WAS LEAKING FROM THE REAR HEATER CORE. I WAS ASKED IF I HEARD A CLICKING SOUND IN THE INSIDE OF THE CAR COMING FROM THE BACK. I TOLD HIM I HEARD IT OFF AND ON. IT WAS DETERMINED THAT WAS WERE THE SMOKE CAME FROM EARLIER. *TR