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The thermostat on the 2014 VW Jetta is located under the housing near the water pump on the cylinder head. It is recommended to replace the coolant every 60,000 miles. The air filter should be replaced every 15,000 to 30,000 miles. Spark plugs should be changed every 100,000 miles except for copper ones, which need to be changed every 30,000 miles. Engine issues may arise, such as a loose gasket or a spark plug popping off, which should be addressed promptly. Oil leaks should be repaired immediately, and excessive oil use may require more frequent oil changes. Engine overheating is a serious problem that can lead to fires and even the car exploding.
In the 2014 VW Jetta, you can find the thermostat situated underneath the housing close to the water pump on the cylinder head.