Mercedes-Benz 300D 2.5 1990 Owner's Manual page 75

1 Coolant reservoir cap
2 Marking for coolant level
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
tem perature is above 90°C
(194°F). Allow engine to cool
down before removing cap.
The coolant reservoir contains
hot w ater/anticorrosion/anti­
freeze mixture and is under
pressure.
• Using a rag, turn cap to first
notch to relieve excess pres­
sure. If opened immediately,
hot scalding fluid and steam
will be blown out under pres­
sure possibly causing perso­
nal injury.
• Do not spill antifreeze on hot
engine parts. Antifreeze
contains ethylene glycol
which may burn if it comes
into contact with hot engine
parts. You can be seriously
burned.
The drain plugs for the cooling system
are located on the right side of the
engine block and at the bottom of the
radiator.