Monaco DIPLOMAT 2004 Owner's Manual page 411

The charge air cooler, cools the intake air for the engine after it has
passed through the turbocharger. This is necessary due to the heat generated
as the intake air is pressurized, and subsequently heated, as it passes through
the turbocharger.
With all the components working together to maintain the engine,
transmission, and hydraulics operating at the proper temperatures proper
maintenance of the cooling system is very important. One neglected
component could result in cooling problems. Maintenance of the cooling
system includes maintaining a proper coolant level with the correct mixture
of coolant and additives, inspection of cooling system components, flushing
the engine coolant system with approved cleaners, and ensuring that the
exterior of the radiator and other external coolers are kept clean and free of
debris.
Understand that adding straight water or antifreeze to the system creates
an imbalance of the coolant mixture. While adding small amounts
occasionally may not affect the mixture greatly, large amounts (½ gallon) or
frequent "top-offs" will.
Three components necessary for the proper coolant mixture are clean
water, glycol antifreeze (ethylene or propylene), and Supplemental Coolant
Additives (SCA). The water in the coolant system serves as the "base." It is
critical to use as pure of water as possible. Salts and other minerals in the
water can solidify in the cooling system causing scaling and "clogging"
of the radiator. Distilled or de-ionized water is recommended for use in
the cooling system in order to avoid these problems.
Glycol antifreeze, usually in the form of ethylene glycol or propylene
glycol, provides an increased boiling point of the coolant mixture,
increased freeze protection, and helps prevent water pump cavitation
(air bubbles in the coolant mixture that can result in wear of the engine).
While the ratio of water and glycol can be adjusted to meet differing anti-boil
and freeze protection, it is recommended that a mixture of 50% water and
50% glycol be used. This 50/50 mixture provides freeze protection to -34º F.
CHASSIS INFORMATION
DIPLOMAT 2004
10 • 411