Holiday Navigator 2003 Owner's Manual page 426

Chassis Information
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Engine Coolant Reservoir:
A "see-through" plastic reservoir, similar to the familiar
windshield washer jar, is connected to the radiator by a hose.
As the motorhome is driven, coolant is heated and expands.
A portion of fluid displaced by this expansion flows from the
radiator into the reservoir tank. When the engine is stopped,
the coolant cools and contracts. Displaced coolant is drawn
back in the radiator by a vacuum. Thus, the radiator is kept
filled with coolant to the desired level at all times resulting in
increased cooling efficiency. The coolant level should be at
or slightly above the appropriate mark on the reservoir
tank when the system is cold.
030823
CAUTION: To avoid scalding hot steam or coolant from being
released from the engine cooling system, never remove the reservoir
cap while the engine is running or hot. Failure to follow this warning
may result in damage to the engine's cooling system and possibly
cause severe personal injury.
• Check the coolant level daily or when refueling.
• Drain and flush the coolant system every 60,000 miles or two
years, and refill with a heavy-duty coolant (50/50 mix of water
and anti-freeze).
• If the coolant is below the MIN mark, the low coolant alarm will
sound and the low coolant light will appear on the dash.
• The coolant level remains between the MAX and MIN level in the
reservoir.
INSPECT: Stop the motorhome and inspect the coolant level before
continued operation.
Routine Maintenance Recommendations:
1. Check the SCA concentration level every 15,000 miles/6 months.
2. Change the coolant filter every 15,000 miles/6 months.
3. Drain and flush the system every 240,000 miles/2 years, and refill
with a heavy-duty coolant (50/50 mix of water and antifreeze).
4. Always use antifreeze. In addition to freeze protection, antifreeze
is essential for overheat and corrosion protection.
5. The supplemental coolant additive (SCA) is required.
6. Freeze point should be measured every 15,000 miles/6 months.
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