Yeah...esp with the hot temps of summer and sitting in traffic. I have a 180* stat and manual fan switch and sitting in traffic mine will creep up just a little. I used to have a Mitsu Galant that had a bad thermostat prob, so I had to run the heat full blast for 3 days so the car wouldnt over heat, till the part got here. Mind you this was in the middle of July lol.