168 S450 Operation & Maintenance Manual
ENGINE COOLING SYSTEM (CONT’D)
Removing And Replacing Coolant
See the SERVICE SCHEDULE for the correct service
interval. (See SERVICE SCHEDULE on Page 134.)
Stop the engine, open the rear door, and remove the rear
grille. (See REAR GRILLE on Page 150.)
AVOID INJURY
Do not remove engine coolant cap when the engine
is hot. You can be seriously burned.
W-2607-0804
Figure 228
Remove the coolant fill cap (Item 1) [Figure 228].
Figure 229
Attach a hose to the coolant drain petcock (Item 1)
[Figure 229] located below the oil fill cap. Open the
petcock and drain the coolant into a container.
Close the petcock and remove the hose.
Recycle or dispose of used coolant in an environmentally
safe manner.
Mix new coolant in a separate container. (See Capacities
on Page 221.)
The correct mixture of coolant to provide a -37°C (-34°F)
freeze protection is 5 L propylene glycol mixed with 4,4 L
of water OR 1 U.S. gal propylene glycol mixed with 3.5 qt
of water.
AVOID ENGINE DAMAGE
Always use the correct ratio of water to antifreeze.
Too much antifreeze reduces cooling system
efficiency and may cause serious premature engine
damage.
Too little antifreeze reduces the additives which
protect the internal engine components; reduces the
boiling point and freeze protection of the system.
Always add a premixed solution. Adding full strength
concentrated coolant can cause serious premature
engine damage.
I-2124-0497
Add premixed coolant, 47% water and 53% propylene
glycol to the coolant tank until the coolant level reaches
the lower level marker on the tank (Item 2) [Figure 228].
Install the coolant fill cap (Item 1) [Figure 228].
NOTE: The coolant fill cap must be tightened until the
cap clicks.
Install the rear grille and close the rear door.
Operate the engine until coolant reaches normal
operating temperature. Stop the engine.
Check the coolant level when cool. Add coolant as
needed. (See Checking And Adding Coolant on Page
167.)
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