IN A LOW SPEED, LOW IMPACT CRASH, THE CHEST CLIP ON THE INTEGRAL CHILD SAFETY SEAT CAME OPEN. MY SON HAD MARKS ON HIS SHOLDERS. HARMON CHEVROLET ORDERED A NEW SEAT, BUT THE NEW ONE PERFORMED THE SAME WAY. THE CHEST STRAP IS WEAK ENOUGH FOR MY FOUR YEAR OLD TO PUSH HIS CHEST AGAINST IT WHEN STRAPPED IN AND POP IT OPEN. HARMON CONTACTED GM AND WAS INFORMED THAT THE SEAT WAS DESIGNED TO OPEN IN A CRASH. I AM VERY CONCERNED THAT IF A MINOR CRASH CAUSED MARKS THAT A HIGH IMPACT CRASH WOULD BREAK HIS BACK WHEN HE WAS IMPELLED FORWARD. I HAVE NEVER HEARD OF A CHILD CAR SEAT BEING DESIGNED TO COME OPEN AND AM QUITE CONVINCED THAT THE OPPOSITE IS SUPPOSED TO HAPPEN. THE SEAT IS VERY POORLY DESIGNED IN THAT THERE IS A HARD BAR SITUATED DIRECTLY UNDER THE BUTTOCKS AND IS UNSAFE IN THAT IT WILL NOT PROTECT A CHILD IN A CRASH. I WOULD TRULY LIKE TO SEE THESE FLAWS FIXED PROMPTLY.*AK