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Make double, triple sure that the thermostat is the correct heat range and was not installed upside down. Both are pretty common mistakes. Lastly, your water pump could be going bad and not pumping enough coolant to do the job. Try the first two first. I'm betting it's one of those. Also check the bottom of the radiator for a build up of dirt and bugs, etc. along a stripe about 3 inches high.

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Q: Your 2001 Oldsmobile alero runs hot i changed the thermostat and flushed the system?
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