Can a stuck thermostat cause heater to stop working in winter?

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Can a stuck thermostat cause heater to stop working in winter?

I noticed that the heater in my Suzuki Mehran is not blowing warm air during winter mornings. Someone told me it might be due to a thermostat stuck in the open position. How can I confirm if that’s true? And how does thermostat position affect heating?

Gari Specialist asked on 17 Apr 2025 11:47:58 am

1 Answer

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Gari Master - on 17 Apr 2025 11:51:56 am

Yes. If the thermostat is stuck open, the engine may not reach the proper temperature, which means the heater core won’t get hot coolant — so you’ll only get cold air from the heater. Replace the thermostat if it’s stuck open. A working thermostat helps regulate engine temperature and provides proper heating.