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You may try checking the engine coolant temperature(ECT) sensor. When the engine is hot just disconnect the connector from the ECT and measure the resistance of the sensor with a meter. Should be around 3.5K - 4.5 K ohms. When it cools down the resistance will rise to above 15k ohms and maybe even higher. If it doesn't checkout you may want to replace it. They are about $15 at Autozone. Very easy to do yourself. It's the sensor that sits on the block within 2 inches of the oil cap on my '97 4 cylinder. It just unscrews with a socket. You won't lose much coolant so you don't even have to drain the coolant down.
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