CLOSED COOLING SYSTEM
SERVICE MANUAL NUMBER 22
90-860074-1 FEBRUARY 2002 Page 6B-19
Cleaning Closed Cooling System
The closed cooling section of the cooling system should be cleaned according to the
Maintenance Schedules in SECTION 1B, or whenever decreased cooling efficiency is
experienced.
A good grade automotive cooling system cleaning solution may be used to remove rust,
scale or other foreign material. Always follow manufacturer’s instructions for the cleaner.
If closed cooling system is extremely dirty, a pressure flushing device may be used to flush
out remaining deposits. Flushing should be done in direction opposite normal coolant flow
to allow water to get behind deposits and force them out. Refer to instructions which
accompany flushing device for proper hookup and flushing procedure.
Using A Cleaner
1. Drain closed cooling system.
NOTE: Properly dispose of old coolant.
2. Add one liter of Cooling System Cleaner (92-814825) or add Fleetgaurd Restore
CC2610 to cooling system following the manufacturer’s instructions.
3. Fill the cooling system with tap water to within 13 - 19 mm (1/2 - 3/4 in.) of bottom of filler
neck.
4. Install pressure cap.
NOTE: During system cleaning leave auxiliary heater, if equipped, connected to engine.
Otherwise, the engine will be contaminated when the heater is reconnected.
5. Operate the engine in open water at wide open throttle at normal operating temperature
for a minimum of thirty minutes to circulate cleaner.
6. Stop the engine and after cool down, drain cleaner from closed cooling system.
7. Flush the closed cooling system. Refer to Flushing The Closed Cooling System.
NOTE: Properly dispose of contaminated cleaner.
Heat Exchanger and Cooler Cleaning
1. Clean tubes in heat exchanger and coolers by running a suitable wire brush through
each tube.
71724
a
a-Wire Brush, Sized to Fit Passages
2. Rinse out heat exchanger and cooler tubes with tap water from a hose to remove
loosened particles.
3. Replace unit if it cannot be satisfactorily cleaned.
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