Thermostat is a small item that plays a large role in engine performance.
Moreover, it regulates the coolant that flows through the engine in Volkswagen.
Once you crank the ignition on, the thermostat will open to regulate the coolant’s temperature.
A functioning thermostat keeps the engine working at an optimum temperature.
When the thermostat is failed, you will notice the below signs in Volkswagen.
Unusual Temperature Gauge Reading
When you first turn on the ignition, the temperature gauge should display a correct reading.
If the temperature gauge is stuck closed or open, then it shows unusual reading.
Coolant Leak
If the thermostat is stuck in a closed position, the coolant can become backed up.
Backed-up coolant can overflow from the thermostat housing and start to leak.
Engine Overheating
Due to the bad thermostat, the temperature gauge reports high temperatures.
Worn thermostat stuck in the closed position and make the engine overheat.
Reduced Fuel Mileage
Failed temperature gauge either runs the engine hot or cold, so the car must work harder.
This additional stress on the engine can significantly decrease the fuel mileage.
Engine Is Too Cold
If the thermostat is stuck open, then too much coolant flow through the radiator.
If the thermostat won’t close, the heater is failed and flow cold air through the vents.
Conclusion
If you suspect your Volkswagen has a faulty thermostat, bring it to a mechanic.
In this way, the mechanic will determine the problem and replace it quickly.
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