1. If the coolant indicator light up, it tells your car coolant is insufficient. Firstly observe the coolant in the reservoir tank if it is lower than the low level indicator of the tank. If yes, owner can top up the coolant accordingly.
2. If there is still same situation occure after top up the coolant, need to check if the surrounding of reservoir tank has any sign of watermark, or if the tank is broken. If the tank is intact, check the coolant hose if it is broken. If confirmed the reservoir tank of hose is leaking, suggest to repair at workshop.
Suggest to repair at workshop. The usual keypoints and procedure of repair are: Replace the leaking parts (Coolant reservoir tank or hose).