MAINTENANCE SERVICE MANUAL NUMBER 23
Page 1B-54 90-861326--1 MARCH 1999
DRAINING CLOSED COOLING (COOLANT) MODELS
NOTE: All factory installed closed cooling systems come filled with DexCool Extended Life
Coolant. This antifreeze requires draining and replacing every five years. The color of this
antifreeze is orange. For best results any “top-off” fluid used should be DexCool Extended
Life Coolant. If DexCool Extended Life Coolant. is unavailable any type of ethylene glycol
based antifreeze may be used, but it will require the draining and replacing of the coolant
every two years.
IMPORTANT: Drain seawater section of closed cooling system only.
CAUTION
If boat is to remain in water after draining, seawater inlet hose must be removed and
plugged to prevent a siphoning action that may occur allowing seawater to flow
from the drain holes or removed hoses.
IMPORTANT: Boat must be as level as possible to ensure complete draining of
cooling system.
CAUTION
Seawater section of cooling system MUST BE COMPLETELY drained for winter
storage or immediately after cold weather use if the possibility of freezing
temperatures exist. Failure to comply may result in trapped water causing freeze
and/or corrosion damage to engine. Damage caused by freezing IS NOT
covered by
the MerCruiser Limited Warranty.
IMPORTANT: Closed cooling section must be kept filled year-round with recom-
mended coolant. If engine will be exposed to freezing temperatures, make sure
closed cooling section is filled with an ethylene glycol antifreeze and water solution
properly mixed to protect engine to lowest temperature to which it will be exposed.
Quicksilver Premixed Marine Engine Coolant is already mixed.
IMPORTANT: Do not use Propylene Glycol Antifreeze in the closed cooling section
of the engine.
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