DSG-423 COOLING SYSTEM
05-9
GENERAL SERVICE PROCEDURES
Draining the Cooling System
WARNING: REFER TO CAUTIONS AND WARNINGS
AT THE BEGINNING OF THIS SECTION.
1. Remove radiator cap.
CAUTION: The coolant must be recovered in a suit-
able, clean container for reuse. If the coolant is con-
taminated, it must be recycled or disposed of
correctly.
2. Open drain cock at radiator and drain old coolant
from engine into a suitable container. Close the drain
cock when finished.
3. If necessary, remove the lower radiator hose to
completely drain the system. Reinstall when
finished.
4. If rust, sludge or other foreign material are present in
the old coolant, system should be flushed -- Refer
to“Flushing the Cooling System” on page 9 of this
section.
Flushing the Cooling System
To remove rust, sludge and other foreign material from
the cooling system, use Rotunda Cooling System
Cleanser. Removal of such material restores cooling
efficiency and avoids overheating.
Always remove the thermostat prior to pressure
flushing. A pulsating or reversed direction of flushing
water flow will loosen sediment more quickly than a
steady flow in the normal direction of coolant flow.
In severe cases where cleaning solvents will not
properly clean the cooling system for efficient operation,
it will be necessary to use the pressure flushing method.
Various types of flushing equipment are available.
Follow manufacturer’s operating instructions.
Filling the Cooling System
WARNING: REFER TO CAUTIONS AND WARNINGS
AT THE BEGINNING OF THIS SECTION.
Coolant is made up of a 50/50 mix of ethylene glycol
permanent antifreeze and distilled water. This mixture is
to be used year-round with temperatures above -34.4°C
(-30°F). If recycled coolant is used, it must meet Ford
specification ESE-M97B44-A or WSS-M97B44-D.
CAUTION: Not all coolant recycling processes pro-
duce coolant which meets Ford specification ESE-
M97B44-A or WSS-M97B44-D. Use of coolant that
does not meet specifications may harm engine and
cooling system components.
The engine cooling system is filled with Motorcraft
Premium Gold Engine Coolant. Always refill the cooling
system with the same coolant that was drained from the
system, Do not mix coolant types.
CAUTION: Do not use alcohol type antifreeze, alka-
line brine solutions, or 100,000 mile - red in color
antifreeze. This may cause serious engine cooling
system damage.
NOTE: The use of stop leak may change the color of the
coolant.
1. Make sure the radiator drain cock is completely
closed.
2. Fill the system with the proper coolant mix.
3. Start engine and hold at 2,500 rpm engine speed for
approximately 8 minutes until thermostat opens.
4. Maintain 2,500 rpm for an additional 3 minutes. Add
coolant as necessary.
5. Increase engine speed to 4000 rpm and hold for 5
seconds.
6. Return engine speed to 2,500 rpm and hold for an
additional 3 minutes.
7. Stop the engine and check for leaks.
8. Verify correct fluid level after engine cools for 20
minutes. Top off the degas bottle to “max” line.
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