Mercedes-Benz G-Class G461 Owner's Manual page 184

Practical advice
Troubleshooting
Problem
# The red battery charge
indicator lamp comes on
during or after fording.
B The red coolant warning
lamp lights up while the
engine is running.
182
Possible cause/
consequence
The poly-V-belt is wet and is
slipping on the pulley.
The coolant level is too low.
If this warning lamp comes on
repeatedly, this means that
there is a leak in the coolant
system.
If the coolant level is OK, the
electric fan may have failed.
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Suggested solutions
Drive on slowly.
Do not use too much throttle.
Do not switch off the engine.
The poly-V-belt dries after fording. The red battery indicator
lamp goes out after approximately 15 seconds.
Top up the coolant and observe the warnings ( page 134).
If you need to top up the coolant more frequently than normal,
have the cooling system checked at a qualified specialist
workshop.
Have the cooling system checked immediately at a qualified
specialist workshop.
If the coolant temperature is under 125 °C, you may drive on
to the next qualified specialist workshop.
Avoid placing a heavy load on the engine (e.g. driving in moun-
tainous terrain) and stop/start driving.