How to Solve the Coolant Warning in Passat?

[RonanMarie]

First, check whether the coolant level is too low. If it is, add coolant in time to avoid damaging the engine. If the coolant level is normal but the warning still appears, it may be that the sensor is faulty and needs to be checked and repaired at a repair shop.

[NoahRose]

My Passat also had a coolant warning before, and I almost panicked at the time. It was hot weather, and the warning light suddenly came on while driving. I pulled over first, waited for the engine to cool down, and then opened the hood to check the coolant level. Sure enough, the level in the reservoir was below the minimum line. I immediately added some suitable coolant—remember to use the brand recommended by the manufacturer, and never mix it with water randomly to avoid corroding the pipes. If the level is normal, it might be a sensor or water pump issue, such as a loose sensor or a leaking water pump, which requires a professional check at the 4S shop. Actually, the cooling system is quite critical. If neglected, the engine could overheat and fail, costing tens of thousands. In my case, it was a small leak, and I spent 200 yuan to replace a hose to fix it. Regularly checking the coolant level during maintenance can prevent problems—don’t take it lightly.