I HAVE A FORD E350 4X4 VAN 2003. THERE HAS BEEN FUMES ACCUMULATING IN THE VAN WHEN DRIVING. I GET HEADACHES AND MY EYES TEAR AND MY FEEL SICK. I NOTICED THE FUMES INTENSELY ON 1.25.08 WHEN DRIVING HIGHWAY MILES IN COLD WEATHER AT A DISTANCE OF 2.5 HOURS AND 132 MILES ONE WAY AND 264 ROUND TRIP. THE FUMES BUILD UP WHEN DRIVING. I OPEN MY PASSENGER WINDOW WHILE STILL DRIVING AND IT SEEMS LIKE I GET MORE FUMES. IN ADDITION WHEN I PUT ON THE HEATER IT ALSO FILL UP THE VAN. ON 2.1.08 I DID ANOTHER TRIP LIKE THE ONE THAT WAS MENTION ABOVE. MY WIFE AN I EXPERIENCE THE SAME AFFECT WHICH WERE HEADACHES AND NAUSEOUS. *TR