The drain screw is located under the cooling fan, so pay attention when draining the coolant.
1. Make sure that the engine and radiator are cold.
2. Place a large basin under the radiator drain cock and carefully open the cock. Drain the coolant into the sink.
3. Carefully pour the coolant into a sealed container for disposal.
Try to add the coolant from the original factory of the new Jetta, because the chemical composition of coolant from different manufacturers is different, and chemical reaction may occur to corrode the pipeline, resulting in coolant leakage or pipeline blockage. Once again, when the car is parked and the engine is turned off for a short time, never unscrew the cover of the coolant vent, so as not to spray hot coolant.