How do I know if the thermostat in my Suzuki Cultus is stuck open?

Home > Gari Forums > Suzuki Forums > Suzuki Cultus Forums > Suzuki Cultus Thermostat Failure Forums

How do I know if the thermostat in my Suzuki Cultus is stuck open?

If the thermostat in my Suzuki Cultus is stuck in the open position, how will it affect engine performance? What are the signs that the thermostat is stuck open, and what should I do to fix it?

Gari Specialist asked on 20 Mar 2025 12:53:41 pm

1 Answer

32 views |

Gari Master - on 20 Mar 2025 12:56:19 pm

If the thermostat in your Suzuki Cultus is stuck in the open position, it means the engine coolant is constantly circulating, even when the engine hasn’t reached its optimal operating temperature. This can prevent the engine from warming up properly.

Common Symptoms of a Stuck Open Thermostat:

Engine Takes Longer to Warm Up: You may notice that it takes longer for the engine to reach a normal operating temperature. The engine may struggle to heat up in colder weather.
Low Engine Temperature: The temperature gauge on the dashboard may indicate a lower than normal engine temperature, often below the optimal range usually around 90-100°C.
Poor Heater Performance: If the engine is not reaching the proper temperature, the heater may blow cold air, as it relies on the engines heat to warm up the cabin.
Reduced Fuel Efficiency: A consistently low engine temperature can cause the engine control unit ECU to adjust the fuel-air mixture, leading to poor fuel efficiency and increased emissions.
How to Fix:

Replace the Thermostat: If the thermostat is stuck open, it will need to be replaced. Be sure to use a high-quality replacement part to ensure proper engine temperature regulation.
What to Do:
If your vehicle isn’t warming up properly and the temperature gauge shows a low reading, it’s a good idea to replace the thermostat to restore the engine’s normal operation.