Is it normal for the Tiida's temperature gauge to light up green?

[Lucia]

The Tiida's temperature gauge lighting up green is not normal; it indicates that the water temperature in the radiator is too high. Taking the 2021 Tiida as an example, it is a compact car with body dimensions of 4393mm in length, 1766mm in width, and 1539mm in height, a wheelbase of 2700mm, a minimum ground clearance of 130mm, and a curb weight of 1180kg. The 2021 Tiida is equipped with a 1.6L inline 4-cylinder naturally aspirated engine, delivering a maximum horsepower of 184PS, a maximum torque of 155Nm, and a maximum power of 90kW, paired with a 5-speed manual transmission.

[LaElizabeth]

I've been repairing cars for over a decade. It's completely normal for the Tiida's temperature gauge to show a green light when first started, indicating low coolant temperature. However, if it stays green after the engine warms up, that's cause for concern. Normally, the temperature should reach the middle normal zone within 5 minutes of driving. If it still shows green after 20 minutes, it's likely the thermostat is stuck in the open position, causing the coolant to continuously circulate in a large loop and heat up slowly. A faulty temperature sensor can also falsely report low temperature. I've encountered several car owners with this issue, and replacing the thermostat solved it. Prolonged low temperature operation is problematic as it increases engine wear and fuel consumption, so I recommend getting it checked as soon as possible. Another typical symptom of this issue is insufficient heat from the heater during winter.

[JoshuaAnn]

I've been driving this Tiida for over seven years, and it's quite common for the temperature gauge to show green during cold starts, especially in winter after the car has been parked overnight. If the green light turns to the normal position shortly after driving, it's fine. But last week, after driving on the highway for half an hour, the temperature gauge was still green, and the heater wasn't blowing warm air, so I had to get it checked. The mechanic said it was due to a faulty thermostat, preventing the engine from reaching the normal operating temperature. Continuing to drive like this can actually damage the engine and worsen carbon buildup issues. After replacing it with an original thermostat, everything's back to normal. I recommend getting it fixed immediately if you encounter a similar situation, unlike me who kept driving for two weeks.

[OVivienne]

Don't panic when you see the green coolant temperature gauge! It's normal for the green light to be on during cold starts. But if it stays green after driving for more than ten kilometers, there's definitely a problem. Last time I encountered this, it was due to a faulty coolant temperature sensor giving false readings. Another possibility is that the small circulation system isn't functioning, possibly because the thermostat is stuck, preventing the coolant temperature from rising. This situation can easily cause engine temperature imbalance and reduce the effectiveness of oil lubrication. The most obvious symptom is when the heater takes forever to warm up in winter. It's recommended to go directly to a 4S shop for computer diagnostics—don't try to dismantle it yourself. Last time I did, I ended up damaging the connector.