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Low coolant level, or the cooling fan(s) are not energizing due to a bad fan motor, sensor, or relay- maybe even a broken wire. Engine coolant temperature sensor will cause that everytime... more likely than anything else because it only does it when stuck in traffic or stop sign to stop sign and not on open road.

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โˆ™ 2009-09-12 01:20:49
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Q: What would cause a 1997 Saturn SC1 to overheat when sitting in traffic and not overheat if moving on open road?
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