OK. Quick rundown on hardware- new t-stat (stock temp), 1 year old radiator, brand new sn95 electric fan. Now, at idle it cools amazingly, but while on the highway, it starts to heat up, my autometer gauge claimed at one point 220*, and I'm sure it would have kept going if I didn't hit stop and go. This problem is primarily during the day, at night it seems more controlled. If the car got that hot, would it not boil over? I checked my oil in case it's a head gasket, all seems fine. Last year I had a shop swap out 3 gauges, the last one read correctly. Is it possible that some electrical problem could be screwing up my gauge? I swear this is my annual summer misery with this car. Everything else runs great.