TK 55676-19-IM-EN
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IImmppoorrttaanntt:: Verify the APU engine has proper amount of oil and the A/C system has a partial refrigerant charge before
starting the engine.
7. Start the TriPac engine and use a non-contact thermometer pointed at the water pump bleeder bolt to monitor the
coolant temperature. The water pump bleeder bolt located next to the bleed petcock on the water pump.
8. When the temperature reaches 150 F (66 C) for units with a 160 F (71 C) thermostats, or 170 F (76 C) for units with
180 F (82 C) thermostats, shut off the engine for 2 minutes to allow the thermostat to heat soak and open completely
to purge air out of block, head, and water pump.
9. After 2 minutes, re-start the engine.
10. Remove the expansion tank cap and slowly pour coolant to the expansion tank until the coolant level is at the top of
the window in the expansion tank, then reinstall the expansion tank cap.
Repeat steps 8 through 10 until the coolant level stabilizes. The TriPac APU cooling system should now be bled of all air.
Figure 47. Water Pump Bleeder Bolt and Bleed Petcock Locations Shown
1. Water Pump Bleeder Bolt 2. Bleed Petcock
AA//CC SSyysstteemm CChhaarrggiinngg aanndd AAPPUU EEnnggiinnee SSttaarrtt--uupp PPrroocceedduurreess
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