DISC- 5560108 - Caterpillar

Image1.4.1
Image1.4.2
6. Remove heater hose (HS) connected to the regulator housing. During this time the coolant inside heater circuit will need to be drained. Confirm that the temperature is not high enough to touch the heater hose and leave the pan underneath the hose. Refer to Image1.5.1. and 1.5.2 for location.
Image1.5.1
Image1.5.2
7. Apply air to the heater hose in order to drain the remaining coolant inside heater circuit from bottom of radiator.
8. Plug the heater hose which is removed from regulator housing. Connect 3m of extra drain hose to the regulator housing and route it to ground through inside engine room. Do NOT route this drain hose higher than the top of the radiator. Refer to Image1.6.1. The inner diameter of the hose is 16mm. Leave the pan underneath the hose.
A - Original heater hose
B - Routing of the drain hose
Image1.6.1
9. Close the drain port of the radiator and fill water inside of the radiator. Hot water from inside engine will spout out from extra drain hose.
10. Repeat filling water inside radiator until clean water comes out from drain hose.
11. Drain the water inside the overflow subtank. After washing, fill 2 liters of water inside the subtank.
12. Return the bypass hose and heater hose to original condition and fill water inside radiator.
13. Repeat this procedure from Step 2 to 8 again only one time (total 2 times). Then complete the same procedure from Step 9 to 10 by using premix ELC until ELC comes out from drain hose.
14. Drain the water inside the overflow subtank. After washing the tank, fill the tank with Premix ELC.
15. Return the bypass hose and heater hose to original condition.
16. Perform warmup. Refer to previous Step 2 and 3.
17. Complete the air purge. The air purge should be performed by the following steps:
- Start the engine.
- Operate the engine without the radiator cap until the water temperature regulator opens and the coolant level stabilizes.
- Fill up the radiator to brim full whenever the coolant level is low.