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If your temperature gauge on the dash reads higher or lower than it should, the thermostat could be bad. If the stat is stuck open the engine won't warm up and if the stat is stuck shut the engine will be too hot. If you doubt it at all replace it. It does so much and costs so little.

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13y ago
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Q: How do you know if your thermostat is sticking on your 1997 Ford Escort?
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