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Q: coolant pump bypass? on 2003 Lincoln Town Car

I am told that when the coolant thermostat is closed the coolant bypasses so it flows back to the engine.
Question: Is there a valve to control the bypass? If not what controls the bypass vs the flow through the radiator?
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The thermostat restricts coolant flow to the radiator when the engine is cold, as it warms up the thermostat allows the coolant to flow through the radiator. I hope that helps!
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