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WSG-1068 COOLING SYSTEM
Cooling System Visual Test
Special Tool(s)
Special Service Tools called for by the procedures
can be obtained by calling:
1-800-ROTUNDA (1-800-768-8632).
WARNING: NEVER REMOVE THE PRESSURE
RELIEF CAP WHILE THE ENGINE IS OPERATING OR
WHEN THE COOLING SYSTEM IS HOT. MAY CAUSE
PERSONAL INJURY OR DAMAGE TO COOLING
SYSTEM OR ENGINE. TO AVOID HAVING SCALDING
HOT COOLANT OR STEAM BLOW OUT OF THE
DEGAS BOTTLE WHEN REMOVING THE PRESSURE
RELIEF CAP, WAIT UNTIL THE ENGINE HAS
COOLED DOWN TO AT LEAST 110°F.
1. Wrap a thick cloth around the pressure relief cap
and turn it slowly one-half turn counterclockwise.
Stepping back while the pressure is released
from the cooling system.
2. When you are sure all the pressure has been
released, (still with a cloth) turn
counterclockwise and remove the pressure relief
cap.
CAUTION: If there is engine coolant in
the engine oil the cause must be corrected
and the oil changed or engine damage may
occur.
NOTE: Check the engine coolant in the degas
bottle and radiator (8005) when vehicle has
been allowed to reach normal operating
temperature. This will make sure sufficient
engine coolant exchange has occurred.
3. Inspect the coolant in both the radiator and the
degas bottle for coolant color:
Clear, light green or blue indicates higher
water
content than required
Dark brown indicates unauthorized stop leak
may have been used. Use cooling system
Stop Leak Powder E6AZ-19558-A or
equivalent meeting Ford specification ESE-
M99B170-A only.
A light or reddish-brown color indicates rust
in the cooling system. Flush the system and
refill with the correct mixture of water and
Premium Engine Coolant (green in color),
E2FZ-19549-AA or equivalent meeting Ford
specification ESEM97B44-A.
An irridescent sheen on top of the coolant
indicates a trace of oil is entering the cooling
system.
A milky-brown color indicates that oil is
entering the cooling system.
The causes of the leak might be:
– A blown head gasket (6051).
– A cracked or warped cylinder head (6049).
– A crack in the engine oil gallery and the
cooling passageways.
If engine coolant is present in the engine oil,
the cause of the leak might be:
– A blown head gasket.
– A cracked or warped cylinder head.
– A crack in the engine oil gallery and
cooling passageways.
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