Checking Coolant Level; Adding Coolant - Mercedes-Benz 420 SEL 1988 Owner's Manual

1 Coolant reservoir cap
2 Marking for coolant level
76

Checking Coolant Level

The coolant level can be checked vis­
ually at the transparent coolant reser­
voir.
To check the coolant level, the vehicle
must be parked on level ground.
The coolant level must reach:
The marking (2, arrow) on the reser­
voir when the engine is cold.
Approx. 2 cm (0.8 in) higher when the
engine is at operating temperature.

Adding Coolant

If coolant has to be added, a 50/50
mixture of water and MB anticorro­
sion/antifreeze should be used.
Warning
• Use extreme caution when
opening the hood, if there are
any signs of steam or coolant
leaking from the cooling system.
• Do not remove pressure cap on
coolant reservoir if engine
temperature is above 90° C
(194° F). Allow engine to cool
down before removing cap. The
coolant reservoir contains hot
fluid and is under pressure.
• Using a rag, turn cap to first
notch to relieve excess pressure.
If opened immediately, hot
scalding fluid and steam will be
blown out under pressure.
The drain plugs are located on the
right and left side of the engine and
on the radiator bottom.