My 03 STS in the summer time seems to pass the 12 o'clock water-temp mark on warm/hot days, especially in stop and go traffic. Last summer I flushed the raditor and removed and checked/washed the surge tank, and cap. Once flush was done(2X) add Dex-cool. What should i check next, the previous owner had a shop replace his water pump at around 60k, car now has 72k. I would love to resolve this before it gets hot, and summer rolls around.
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