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Not sure if by your question you mean the thermostat opens slow and the engine overheats or if you mean the engine takes a long time to warm up.

If the engine is overheating, more than likely the thermostat is stuck in the closed position and needs to be replaced before engine damage is caused because of overheating.

If the engine is taking a long time to warm up, the thermostat is probably stuck in the open position and has to be replaced so the engine can reach its normal operating temperature in a shorter time.

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Q: Why is your thermostat slow to open on your 1997 Chevy truck?
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