07/05/2026
‘Top up coolant’ message appearing on your 2020 Mercedes-Benz A, B, GLA, GLB, or CLA-Class?
You may continue driving to your destination as long as the coolant temperature stays below 90°C.
In many cases, the leak originates from the coolant thermostat housing and adapter.
The photos show a GLB200 with these components replaced using original Mercedes-Benz parts. After the repair, specialized computer software is used to properly bleed the cooling system and ensure no air is trapped.
Have your car checked and repaired with us at MJ to keep your vehicle running safely and reliably. ☺️