Hi,信子,I drive the same car. If I am not mistaken,there's no engine-coolant temperature gauge in echo. It's replaced by colored lights: Blue means the engine's still cold; no light means proper operating temperature; red is overheating. Read the car manual, it should be mentioned in the book. It's normal in winter consider drving in such cold weather. But, it doesn't hurt to check the coolant level frequently as 黑哥 said