Coolant Purge Procedure - Carrier ComfortPro PC6000 Operation & Service Manual

62-11175 COMFORTPRO SERVICE MANUAL

COOLANT PURGE PROCEDURE

1 Ensure that the coolant supply valve to the APU (located at the truck
engine) and the coolant return valve to the APU (also located at the
truck engine) are open.
2 Release pressure from coolant system.
3 Remove the truck engine radiator cap.
4 Top up the coolant if necessary in the expansion tank.
5 Run the truck engine at fast idle until 185°F (85°C)is reached on truck
temperature gauge. This should purge most of the air out of the APU.
6 Purging Air From the Coolant.
• Place thermostat drain hose into bucket (see Figure A-7).
• Open the thermostat bleed valve, using a wrench, and let any trapped
air escape until a steady stream of coolant flows from the valve.
• Close thermostat bleeder fitting.
• Top up the coolant if necessary in the truck expansion tank.
• Run the truck engine at fast idle for another 10 minutes to continue
purging air.
THERMOSTAT
DRAIN HOSE
BLEEDER VALVE
OPEN 1/4–1/2 CCW
1/2"
WRENCH
Figure A-7: Drain Hook-up
A-9