Can a faulty thermostat valve cause poor heater performance in Suzuki Bolan?

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Can a faulty thermostat valve cause poor heater performance in Suzuki Bolan?

The heater in my Bolan doesn’t get warm even after the engine runs for a long time in winter. Someone mentioned the thermostat valve might be stuck open. Does a thermostat problem affect the heater? How does this impact overall engine performance in cold weather?

Gari Specialist asked on 10 Apr 2025 12:02:39 pm

1 Answer

20 views |

Gari Master - on 10 Apr 2025 12:17:24 pm

Yes, a thermostat stuck open can cause poor o r no heater performance in your Suzuki Bolan during winter.

When the thermostat is stuck open, coolant keeps flowing through the radiator even when the engine is cold. This prevents the engine from reaching its ideal operating temperature, which also affects the heater.

Signs of thermostat stuck open:

Engine temperature stays low o r fluctuates.

Heater blows cold air even after 15–20 minutes of driving.

Fuel consumption increases in winter.

Fix:
Install a new thermostat valve with the correct temperature rating usually 82°C o r 88°C. This helps the engine warm up faster and keeps the heater working effectively.