What is the reason for the coolant warning in the Tiguan L?

[Mitch]

The reason for the coolant warning in the Tiguan L is excessive evaporation from the vehicle's radiator or damage to the radiator, loose connections at the water reservoir, water pump joint surfaces, and various pipe fittings in the cooling system. Below is an introduction to the Tiguan L: 1. Exterior: The Tiguan L maintains a design similar to the overseas standard Tiguan model, featuring a clean and straightforward overall style. Compared to the standard wheelbase model, it includes additional chrome trim pieces, and the C-pillar design has been modified. The Tiguan L measures 4712/1839/1673 mm in length, width, and height, with a wheelbase of 2791 mm. 2. Powertrain: The Tiguan L PHEV, or SAIC Volkswagen Tiguan L Plug-in Hybrid Electric Vehicle, shares the same overall design as the standard Tiguan L but with some detail differences. The newly designed upper grille features a blue PHEV emblem, and the C-shaped LED daytime running lights are exclusive to the plug-in hybrid version.