The fluid level is fine, about 3 inches down from the top of the rad cap and has always been at that level with no previous over-flow issue . Strange thing is no over-flow in the last few years, or ever for that matter, just recent over-flow. I will check some of the things that ramair68 suggested. I have A/C, but have never used it or the heater since I have owned the car ( 8 years). I have not been driving the car any differently. All city driving, flat land, no hills. Outside temps in the 80's.