Finish Thompson CQC-HD - Manual (Page 14)

Coolant Exchange Operations for Heater Hose
11. Verify that the three way valve located on the side of the CQC-HD is in the quick-change position
12. Open the fill valve on the green hose and turn the fill pump on. The vehicle’s engine does not
have to be turned on.
13. Open the drain valve on the black hose. The new coolant will fill the engine block and the old
coolant will drain into the 30-gallon waste tank in the back of the CQC-HD.
14. Fill the engine block until about 60% of the coolant in the fill container is gone (40% remaining)
and then turn off the fill valve on the green hose and turn the fill pump off.
NOTE: Actual ratios of engine coolant capacity to radiator capacity can vary.
15. Turn off the drain valve on the black hose.
16. Disconnect the CQC-HD from the vehicle. Carefully reconnect the heater hose to its original posi-
tion and securely clamp.
17. Remove the vehicle’s radiator cap and/or overflow bottle cap. Insert the plastic wand on the red
suction hose into the overflow bottle. Turn on the CQC-HD drain pump (the switch is located on
the front right side of the unit) and remove the liquid from the overflow container. Turn off the
drain pump.
Hint: If the overflow bottle contains sludge, loosen it with water sprayed with a hose.
18. Drain the coolant from the radiator by opening the drain valve and collecting the coolant in a
receptacle. You may be able to utilize the red evacuation pump/wand to assist in the drain
process. Place the plastic wand on the end of the petcock valve. Turn the petcock drain valve
and the evacuation pump on. After completion of this step, close the radiator drain valve.
19. Fill the radiator and the overflow bottle using the remaining coolant in the CQC-HD’s upper fill
bucket. Turn the fill pump on, and while holding the green fill hose over the radiator’s opening,
slowly open the fill valve to allow the top off coolant to flow. Also, fill the vehicle’s coolant
overflow bottle to the proper level. Return both caps and secure.
20. Start the engine of the vehicle, allow it to run for a few minutes, then check for leaks.
12.