Monaco CAYMAN 2007, Руководство пользователя

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CHASSIS INFORMATION - 10
196
CAYMAN 2007
After the engine reaches proper temperature,
the water temperature regulator (thermostat)
on the engine opens and allows coolant to fl ow
from the engine, through the upper radiator hose
and into the radiator. The coolant is cooled in
the radiator and fl ows through the transmission
cooler and back to the engine through the lower
radiator tube. A by-pass tube installed between
the thermostat housing and lower radiator tube
functions to supply coolant to the transmission
cooler under certain conditions to ensure proper
cooling.
The charge air cooler cools 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. With the components
working together to maintain the engine and
transmission at the proper temperature, proper
maintenance of the cooling system is very
important. One neglected component could
result in cooling problems.
Maintenance of the cooling system includes
maintaining proper coolant levels with
coolant mixture, regular inspection of system
components, fl ushing the coolant system with
approved cleaners and ensuring that the exterior
of the radiator and other external coolers are
kept clean of debris.
The engine coolant level should be checked
daily to ensure that it is at the proper level. At
the rear of the motorhome is a surge tank. Under
certain lighting conditions it may be diffi cult to
see the level of the coolant in the surge tank and
a fl ashlight held behind the surge tank should
enable easier viewing.
Engine Coolant Reservoir:
The engine coolant
reservoir is connected to
the radiator by a hose.
When the motorhome
is driven, coolant heats
and expands. Expansion-
displaced fl uid fl ows
from the radiator into the
reservoir tank. The coolant
cools and contracts when the engine is stopped,
and coolant is drawn back in the radiator by a
vacuum. Thus, the radiator is kept fi lled with
coolant to the desired level at all times, resulting
in increased cooling effi ciency. The coolant level
should be at, or slightly above, the appropriate
mark on the reservoir tank when the system is
cold.
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.
Coolant Levels:
Check the coolant level daily or when
refueling.
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 should remain between
the MAX and MIN level in the reservoir.
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NOTE:
Have an inspection performed of the
surge tank cap seal and have the cap
pressure tested at each oil change. The
reservoir cap is rated at 16 psi.
INFORMATION:
Refer to OEM manual for detailed
antifreeze information.
Adding Coolant:
If coolant is lost from the engine, it is
necessary to open the petcock at the top-left
of the radiator (NOT the drain petcock at the
bottom of the radiator) when adding coolant.
Then remove the cap from the surge tank and
add the proper mixture of coolant to the system
until it reaches the proper level.
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.
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. The
water in the coolant system serves as a 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.
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