From searching the forum and seeing a bunch of different ways of flushing the coolant on the 6.0 and the 6.4, i typed up a step by step process. Hope this helps. For those of you who have done it, does this look good to you? ill gladly edit with better ways of doing it.
Flushing and Cleaning the 6.4
Parts Needed:
• 20+ gallons Distilled water (grocery store)
• ½ gallon RESTORE (local Cummins dealer)
• ½ gallon RESTORE PLUS (local Cummins dealer)
• 4 gallons ELC rated coolant (local big rig dealer)
• Thermostat set (Ford dealer)
• Updated radiator cap (Ford dealer)
1. Begin by draining as much coolant as possible. Do this by removing the lower radiator hose where it connects to the radiator. Also remove one or both drain plugs in the engine block (one on each side, passenger side is difficult to reach as it is behind the starter.
2. Remove the thermostats (located near the vertical EGR cooler) and replace the thermostat cover without the thermostats. This will allow for quicker circulation of coolant to aid in the cleaning process.
3. Put lower hose back on radiator and put the drain plug(s) back in the block.
4. Put heater controls on high to ensure that heater core gets flushed as well.
5. Fill system with tap water and let the truck run for 5 minutes to let water circulate. Drain system as stated in step 1.
6. Repeat step 5.
7. Add ½ gallon of RESTORE and fill system with tap water again. Let the truck run on high idle for 60-90 minutes (watch temperature!! Allow a little warmer than usual but nothing extreme). Drain system as stated in step one.
8. Flush 3 times as stated in step 5 with tap water.
9. Add ½ gallon of RESTORE PLUS and fill with tap water again. Let the truck run on high idle for 60-90 minutes (watch temperature!! Allow a little warmer than usual but nothing extreme). Drain system as stated in step one.
10. Flush as stated in step 5 with tap water until water comes out clear and clean.
11. Flush 3 more times using distilled water to take any tap water out of the system.
12. After draining the system from step 11, put in new thermostat set.
13. Fill system with 4 gallons of ELC rated concentrated coolant and top off with distilled water
14. Replace radiator reservoir cap with updated cap and check truck for leaks
15. Let truck run for 30 minutes while topping off with distilled water. Keep extra coolant/water with you for a while the air gets worked out of the system.
Flushing and Cleaning the 6.4
Parts Needed:
• 20+ gallons Distilled water (grocery store)
• ½ gallon RESTORE (local Cummins dealer)
• ½ gallon RESTORE PLUS (local Cummins dealer)
• 4 gallons ELC rated coolant (local big rig dealer)
• Thermostat set (Ford dealer)
• Updated radiator cap (Ford dealer)
1. Begin by draining as much coolant as possible. Do this by removing the lower radiator hose where it connects to the radiator. Also remove one or both drain plugs in the engine block (one on each side, passenger side is difficult to reach as it is behind the starter.
2. Remove the thermostats (located near the vertical EGR cooler) and replace the thermostat cover without the thermostats. This will allow for quicker circulation of coolant to aid in the cleaning process.
3. Put lower hose back on radiator and put the drain plug(s) back in the block.
4. Put heater controls on high to ensure that heater core gets flushed as well.
5. Fill system with tap water and let the truck run for 5 minutes to let water circulate. Drain system as stated in step 1.
6. Repeat step 5.
7. Add ½ gallon of RESTORE and fill system with tap water again. Let the truck run on high idle for 60-90 minutes (watch temperature!! Allow a little warmer than usual but nothing extreme). Drain system as stated in step one.
8. Flush 3 times as stated in step 5 with tap water.
9. Add ½ gallon of RESTORE PLUS and fill with tap water again. Let the truck run on high idle for 60-90 minutes (watch temperature!! Allow a little warmer than usual but nothing extreme). Drain system as stated in step one.
10. Flush as stated in step 5 with tap water until water comes out clear and clean.
11. Flush 3 more times using distilled water to take any tap water out of the system.
12. After draining the system from step 11, put in new thermostat set.
13. Fill system with 4 gallons of ELC rated concentrated coolant and top off with distilled water
14. Replace radiator reservoir cap with updated cap and check truck for leaks
15. Let truck run for 30 minutes while topping off with distilled water. Keep extra coolant/water with you for a while the air gets worked out of the system.
