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Answerno thermostat

but only temporarily.

A thermostat functions to regulate the flow of water between the engine and radiator.

On an average outside temperature day (75 degrees), "no thermostat" would result in (1) the engine not reaching operating temperature in the normal engine warm up cycle time and (2) much later in the cycle the engine would overheat caused by the water not remaining in the radiator long enough to cool down. More extreme outside temperatures would impact the previous results.

No thermostat or a defective thermostat that is stuck open. Also could be a deffective coolant temprature sensor. Or air bubble aroune the sensor on some cars.

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Q: What would cause the engine not to reach normal operating temperature?
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