I drove my FJ-62 from Seattle to Sacramento yesterday (avg mpg - 16.4!). On two stops for gas the coolant resevoir overflowed about 1/2 to 1 cup of coolant. It did this only after the engine was stopped for a few minutes (ie in both instances it wasn't overflowing when we pulled in, just after we were stopped). It was very hot during both of these stops, mid to upper 90's, the A/C had been running on full and the coolant temp was over 200 when the engine was stopped in both cases. In both cases when I restarted the truck the coolant temp was over 220 coming out of the block (I've got a good aftermarket temp gauge pumbed into the side of the t-stat housing). My first thought was, great, I've blown a head gasket, again. Coolant overflow from the resevoir was the symptom in my last head gasket problem but that was 20,000+ miles ago. However when we got to Sacramento, which was evening and much cooler than the two gas stops the coolant did not overflow. Engine temp was ~188 (I run a 180 degree t-stat) and the resevoir was full but not to the top as with the two previous stops when it puked. I checked the coolant level this morning expecting to find either the resevoir or the radiator low. To my surprise the resevoir was just below the half way point and the radiator was full. I'm still thinking that I've blown a head gasket but can anyone think of any other possibilities for symptoms like these? Is it possible that the coolant just got extra hot after the engine was shut off, expanded beyond norm and pushed the small amount out? TIA!