I've been having a lot of problems with this light. It seems to come on and go off on it's own schedule. I burped the car and that seemed to eliminate the problem for a while. But, it always seems come back on. I'm "fairly" sure there are no leaks, but the presents of this potentially disruptive tell-tale is unnerving. I've been told the problem is a design issue in that the overflow tank was located too low in the '88 C4. Ok, my question... Has any one overcome this problem and what did you do?