freightliner Custom Classic MT45 2022, Maintenance Manual

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9. Once the coolant has been drained, install and
secure the 5/8 inch supply and return lines on
the high-voltage battery pack.
10. Remove the hose from the inverter inlet and
drain the coolant into a bucket.
11. Once the coolant is completely drained, install
and secure the invertor hose. See Fig. 7.
NOTE: Additional hoses at other locations can
be removed and shop air applied to help drain
the coolant; draining coolant from the batteries
is also recommended.
12. Close all of the petcock valves. See Fig. 4.
13. Close the drain valve on the radiator. See Fig. 3.
14. Install any coolant lines that were removed to
drain the coolant.
NOTICE
Distilled water must always be used when mixing
a 50/50 mixture of coolant concentrate and water.
Normal tap water will lead to corrosion of the
powertrain and battery coolant loops. This type of
damage is not covered by warranty.
If a pre-mixed coolant/water solution is used, dis-
tilled water does not need to be added.
IMPORTANT: The powertrain/battery loop surge
tank must be filled
first . Ensure that the dash
controls are set to cold and the blower is off.
Supplemental coolant additives (SCAs) are not
used with OAT coolant.
15. Fill the surge tank to the COLD FULL mark on
the tank with organic acid technology (OAT) cool-
ant at a rate of 3 gallons per minute (GPM).
16. Once the vehicle is filled to the COLD FULL
mark, start the vehicle and allow it to run for 10
minutes.
17. After the vehicle has run 10 minutes, turn it off
and open all of the petcock valves, shown in
Fig. 4 to release air in the system.
18. With the petcock valves open, check the coolant
level again and add coolant to the COLD FULL
mark. If coolant is seen coming from any of the
petcock valves, close them immediately.
IMPORTANT: Fill the dash/body heater surge
tank
after the powertrain/battery loop surge
tank. Starting the vehicle automatically turns on
the pumps for the powertrain/battery loop; these
pumps must not be ran without the proper
amount of coolant in the system. The dash/body
heater pump activates when the dash control is
set to hot and the blower is running.
19. Ensure that the powertrain/battery loop surge
tank is at the full mark. Do not let the pumps run
dry.
20. Fill the dash/body heater surge tank until the
sight glass is filled with coolant.
21. Start the vehicle, then set the heater control to
hot and run the blower. Allow the vehicle to run
for 30 minutes to deaerate.
22. Add coolant until the sight glass is filled and en-
sure that the coolant level is within limits on the
surge tank.
f200977 10/15/2021
1
1. Invertor Line
Fig. 7, Invertor Inlet Hose
Engine Cooling/Radiator
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Walk-In Van Chassis Maintenance Manual, January 2022
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