THIS IS AN ONGOING ISSUE WITH THE HEATER CONTROL SWITCH. THE TEMPERATURE KNOB WILL NOT CHANGE FROM COOL TO WARM. AFTER I TURN IT FAST BACK AND FORTH, SOMETIMES IT MAY TRIGGER THE CHANGE. THIS HAS BEEN HAPPENING ALMOST A YEAR. ALL OTHER CONTROLS ON THE UNIT WORK FINE. I HAVE TALKED TO MANY MECHANICS WHO HAVE SAID THIS IS A REGULAR ISSUE AND ONE FRIEND SAID HE HAD REPLACED SO MANY OF THESE CONTROL UNITS ON THIS VEHICLE THAT HE CANNOT EVEN BEGIN TO COUNT. THE DANGER IS WHEN YOU CANT USE THE DEFROST. WHEN THIS FIRST HAPPENED, I WAS PICKING UP 5 CHILDREN FROM GRADE SCHOOL. JUST DRIVING DOWN THE ROAD ALL A SUDDEN THE DEFROST STOPPED BLOWING HOT AIR. I LIVE NEAR CHICAGO AND THE TEMP WAS BELOW ZERO. THE WINDSHIELD FOGGED AND ICED UP AND NOTHING I COULD DO. LUCKILY I WAS A BLOCK FROM HOME AND HAD ENOUGH VISION BY USING HAND TO CLEAN WINDSHIELD THAT I MADE IT HOME. WHEN I LET KIDS OUT I WENT TO PULL CAR INSIDE GARAGE AND COULDNT SEE AND HIT SIDE OF GARAGE AND BROKE SIDE OF PASSENGER MIRROR. THIS PART COSTS ON AVERAGE OF ALMOST 400 DOLLARS AND IS EASY TO CHANGE. THIS SHOULD NOT HAPPEN ON ANY CAR UNDER 85,000 MILES. THIS IS A SERIOUSLY DANGEROUS PROBLEM WHEN THE DEFROST GOES OUT WHILE DRIVING IN SUB FREEZING WEATHER. WITH THIS BEING A ISSUE THAT SO MANY MECHANICS HAVE SAID THIS IS A SERIOUS ISSUE IN REPLACING SO MANY OF THEM, THERE IS OBVIOUSLY A SERIOUS DEFECT IN THE CONTROLS ON THE SWITCH. THIS IS A VERY DANGEROUS SAFETY CONCERN WHEN THE DEFROST TEMPS CHANGES OR STOPS WORKING WHILE DRI