What role does the thermostat play in engine overheating in my Alto Lapin?

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What role does the thermostat play in engine overheating in my Alto Lapin?

I’ve heard that a malfunctioning thermostat could lead to engine overheating. How can I tell if the thermostat in my Alto Lapin is the culprit, and what should I do if it’s stuck o r not functioning correctly?

Gari Specialist asked on 05 Mar 2025 12:25:38 pm

1 Answer

24 views |

Gari Master - on 05 Mar 2025 12:37:39 pm

The thermostat regulates the flow of coolant through the engine, opening and closing depending on the engine’s temperature. If the thermostat malfunctions and gets stuck in the closed position, it can prevent coolant from circulating properly, causing the engine to overheat.

Signs of a Faulty Thermostat:

Engine overheating: If the engine overheats quickly, especially after starting, the thermostat may not be opening to allow coolant to flow.
Erratic temperature gauge readings: The temperature gauge may fluctuate, either reading too high o r too low, indicating that the thermostat is not regulating coolant flow properly.
No heat in the cabin: A stuck thermostat may also prevent warm coolant from reaching the heater core, causing the cabin heater to stop working.
Solution:

Test the thermostat: If you suspect the thermostat is stuck, it can be tested by removing it and placing it in hot water. If it doesn’t open, it should be replaced.
Replace the thermostat: It’s recommended to replace the thermostat every 3-5 years, especially in harsh climates like Pakistan.