Thermo King T-1080S, Maintenance Manual

Page: 95 / 191

Engine Maintenance
94
Figure 174: Close-Up of Attached
Spill-Free Funnel Tool
b. Lock the HMI on the Coolant Temperature
in the Gauges Menu to read engine coolant
temperature. (If the unit is equipped with a
standard HMI, a service tool should be
used.)
c. As the coolant temperature increases, air
bubbles will escape through the Spill-Free
Funnel. Run the engine until the
thermostat begins to open at
approximately 162 F (72 C). As the
coolant temperature increases it will
expand and rise in the spill free funnel.
d. Allow the engine to run on high speed at a
stabilized coolant temperature of
approximately 185 F (85 C) until the air
bubbles cease to come out of the coolant.
The Procedure takes about a half an hour.
NOTE: To achieve a coolant temperature
of 185 F (85 C) it will be necessary to
cover the condenser coil from the top
edge down, slowly move the cover down,
thereby increasing the coolant
temperature and fully opening the
thermostat. See Figure 175. Monitor the
coolant temperature and head pressure.
Be careful not to cover too much of the
condenser coil or the unit will shut down
with high head pressure and exceed the
desired 185F coolant temperature.
Figure 175: Cover Condenser Coil If Necessary
e. Squeeze the upper radiator hose closed
and open to vary the flow of coolant
through the radiator and help push air out
of the radiator. Be careful to keep hands,
rags or tools away from the water pump
pulley and belt.
CAUTION: The radiator tube is hot.
f. As air escapes from the cooling system the
coolant level in the fill tube will decrease.
Should the coolant level drop down so low
it is no longer visible, add additional
coolant at the top of the spill free funnel.
Continue this step until the air bubbles
stop being expelled out through the funnel.
g. Periodically check the head pressure on
the HMI to ensure the pressure does not
become excessively high and cause the
unit to shut down.
h. Repeat Steps 2d thru 2f as required until
the coolant level in the spill free funnel
remains constant and there are no more air
bubbles in the funnel.
i. Then squeeze/clamp the hose between the
expansion tank and thermostat to force
more coolant flow through the radiator.
This will likely lower the temperature of
the coolant so the coverage of the
condenser coil will need to be increased to
maintain the coolant temperature at
approximately 185 F (85 C).
CAUTION: The coolant is hot. Take care
to avoid being burned.