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<h2>What is an engine thermostat?</h2>
&nbsp;While all engines can become too hot, if your thermostat isn't working correctly, your engine's well-being is at serious risk. The engine thermostat, often simply referred to as a thermostat, regulates the engine's operating temperature within an optimal range (typically around 195 to 220 degrees Fahrenheit).
<h2>How does a car thermostat work?</h2>
As a temperature-sensitive valve within the cooling system, a car thermostat responds to changes in coolant temperature. Understanding how it works by the following breakdown steps:
<ul>
<li>Closed position (cold start)</li>
</ul>
Initially closed to help the engine warm up quickly.
<ul>
<li>Heating up</li>
</ul>
The engine generates heat during operation.
<ul>
<li>Opening the thermostat</li>
</ul>
A temperature-sensitive element (usually wax) causes the thermostat to open gradually.
<ul>
<li>Coolant flow</li>
</ul>
When open, coolant flows from the engine to the radiator.
<ul>
<li>Maintaining optimal temperature</li>
</ul>
Adjusts coolant flow to maintain the ideal engine temperature.
<ul>
<li>Temperature regulation</li>
</ul>
Continuously adjusts to prevent overheating and ensure efficient operation.
<h2>Signs of a bad thermostat</h2>
<ol>
<li>Overheating: The engine becomes excessively hot due to a stuck-closed thermostat.</li>
<li>Low or fluctuating temperature: A thermostat stuck open results in a cooler engine, affecting fuel efficiency and heating.</li>
<li>Temperature warning light: Illuminates to indicate engine overheating due to a faulty thermostat.</li>
<li>Poor fuel efficiency: Stuck-open thermostat reduces fuel efficiency as the engine operates less efficiently at lower temperatures.</li>
<li>Inadequate cabin heating: Insufficient cabin heating in cold weather with a thermostat that's stuck open.</li>
<li>Coolant leaks: Gasket or sealing issues can lead to coolant leaks.</li>
<li>Rapid temperature fluctuations: The gauge shows rapid swings between hot and cold.</li>
<li>Engine running hot at idle: Higher engine temperature during idle or in traffic due to restricted coolant flow.</li>
<li>Slow or inconsistent warm-up: Longer-than-normal warm-up times, even in moderate weather.</li>
<li>Inconsistent heater operation: This affects the performance of the vehicle's heater, causing inconsistent or inadequate heating in cold weather.</li>
</ol>

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Thermostat Housing Assembly for 2015-2020 BMW M4

Thermostat Housing Assembly

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