Monaco DIPLOMAT 2004, Owner'S Manual

Page: 416 / 446

DIPLOMAT 2004
10 • 416
CHASSIS INFORMATION
Coolant Overheated:
If the engine is overheated, never pour cold coolant into a hot engine. The
sudden change in temperature may crack the cylinder head or block. If the engine is
hot, fill slowly to prevent rapid cooling and distortion of engine castings.
Coolant Changing:
24 months/60,000 miles - Inspect and clean the cooling system and charge air
systems to promote system cleanliness and to enhance engine cooling. Stop the
engine and allow it to cool. Remove the cap from the surge tank and place a large
container beneath the drain valve on the radiator. Open the drain valve and allow the
cooling system to drain. With the drain valve open, flush the cooling system with
clean water to remove debris. Dispose of the old coolant mixture appropriately.
Close the drain valve and fill the cooling system with a mixture of clean water and
sodium carbonate. One pound of sodium carbonate is needed for every six gallons of
water. Operate the engine for five minutes at temperature above 176 º F. Stop the
engine and allow the system to cool. Open the radiator drain valve to allow the
system to drain. Fill the system with high quality water. Again, operate the engine
for five minutes at temperature above 176 º F. Flush the system with clean water
until the draining water is clear. Allow draining completely.
Inspect the water pump
standpipe for blockage.
Replace the thermostat. Loosen the hose clamps and remove the hose assembly
from the radiator to thermostat housing assembly. Remove the thermostat housing
assembly from the cylinder head. Remove the thermostat and gasket from the
housing, along with the seal in the housing. Install the new thermostat, seal and
gasket into the housing. Re-install the thermostat housing and connect the hose
assembly. Tighten the hose clamps. Ensure that the drain valve for the radiator is
closed. Fill the cooling system with the recommended coolant / water / coolant
additive mixture. Start the engine with the surge tank cap removed and allow the
coolant to warm and the thermostat to open. Add coolant mixture until the coolant
level in the surge tank is between MIN and MAX. Replace the surge tank cap.
Allow the engine to warm to operating temperature while observing for coolant
leaks. Stop the engine.
Inspect the radiator core and CAC for dirt and debris build-up. Wash any
accumulations using high-pressure water, being careful not to damage the fins from
excessive pressure. Any grease or oil build-up should first be treated with a
non-caustic degreaser to ensure a thorough cleaning.
Coolant System - Thawing:
If the coolant system becomes frozen solid, place the motorhome in a warm area
until completely thawed. At this point the motorhome must be towed. If the engine
is operated when the cooling system is frozen it will result in engine overheating due
to insufficient coolant circulation. Once thawed, check engine, radiator and related
components for damage caused by expansion of frozen coolant.