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L510010-07A
ENGINE MAINTENANCE - 11
FILLING FRESH-WATER COOLING SYSTEM
A new extended life engine coolant known as DEX-
COOL™ is used in your engine(s). It is imperative to
note the following about DEX-COOL™ engine coolant:
• IT IS PINK IN COLOR TO DISTINGUISH IT
FROM CONVENTIONAL COOLANT.
• THE SERVICE CHANGE INTERVAL ON
ENGINES BUILT WITH DEX-COOL™ IS 5
YEARS.
• TO MAINTAIN FULL CORROSION
PROTECTION DURABILITY, DEX-COOL™
MUST NOT BE MIXED WITH CONVENTIONAL
(CONTAINING SILICATE) ENGINE COOLANTS.
• DEX-COOL™ IS AN ETHYLENE GLYCOL
BASED PRODUCT, THEREFORE, BOIL AND
FREEZE PROTECTION ARE MEASURED IN
THE SAME FASHION AS CONVENTIONAL
COOLANTS.
TO FULLY REALIZE ITS MANY ADVANTAGES,
DEX-COOL™ MUST NEVER BE MIXED WITH
CONVENTIONAL COOLANTS.
DEX-COOL™ can become contaminated by
inadvertently topping-off with conventional coolant,
adding conventional coolant to the system or even if
fi ll/drain containers are shared between coolants. If
contamination occurs, the cooling system must be
immediately drained and fl ushed, and refi lled with DEX-
COOL™. No short-term damage will occur, however,
the service interval will be reduced from 5 years to 2
years.
The fresh-water cooling side of the cooling system
must be fi lled with a 50/50 mixture of DEX-COOL™
(or equivalent, which meets GM6277M) extended life
antifreeze and water solution.
IMPORTANT: More than 50% antifreeze solution can
contribute to an overheating condition.
IMPORTANT: If the engine is being placed in winter
storage, the fresh-water cooling section must be fi lled
with a correct type of coolant and water solution,
properly mixed, to protect the engine to the lowest
temperature to which it will be exposed.
1. Make sure that all drain plugs are properly
installed.
2. Remove the pressure cap. Fill the system with
antifreeze solution until the system is fi lled.
See ENGINE FLUID CAPACITIES for system
capacities.
3. Start the engine and operate at idle speed (1200-
1500 RPM) to purge any air from the system.
When the system is full, install the pressure cap.
Figure 11-12 Filling F.W.C. System (6.0L)
ANTIFREEZE
SOLUTION
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