4 things:
1) get a real gauge. The factory gauges sucked when they were new, but yours is going on 13 years old, and is worthless.
2) Ditch the 160 t-stat and get a 180. There is absolutely no reason at all to use a 160 t-stat in a daily driver.
3) Replace your radiator. You may think it looks fine, but it's not. The only time an engine runs hotter on the freeway than it does in stop and go traffic is when the radiator has clogged passages. You can't tell without taking it apart, but I can.
4) When you refill the system after putting in your new radiator, temp gauge, and t-stat, make sure you don't use more than a half gallon of coolant! Your mix should be at least 80% water.
Take care,
~Chris
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