How does thermostat failure affect the engine performance of a Honda City?

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How does thermostat failure affect the engine performance of a Honda City?

Can a faulty thermostat cause engine overheating, poor fuel efficiency, o r even engine misfires?
What are the long-term consequences of driving with a malfunctioning thermostat?

Sirat Ul Jinan asked on 26 Feb 2025 10:55:50 am

1 Answer

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Car Mechanic Expert - on 26 Feb 2025 10:57:57 am

Effects on Engine Performance:

Engine Overheating: A stuck-closed thermostat prevents coolant flow, causing the engine to overheat. This can lead to permanent engine damage.
Poor Fuel Efficiency: A thermostat stuck open means the engine runs cooler than usual, affecting the fuel combustion process and leading to reduced fuel efficiency.
Engine Misfires: If the engine operates outside its ideal temperature range too cold o r too hot, it may misfire o r run roughly.
Long-Term Consequences:
Blown Head Gasket: Overheating caused by a faulty thermostat can result in a blown head gasket, which is an expensive repair.
Engine Seizure: Prolonged overheating can lead to severe damage to the engine block and pistons, potentially causing engine seizure.