I wanted to flush my cooling system in my 2006 F250 before summer, so I go to the 6.0 Tech File and there is no cooling flush procedure in there. Unless I missed it.

 

Here's a thread with the info:

https://www.ford-trucks.com/forums/6...tem-flush.html

 

Yea our mod is kinda lazy =D

A search should bring up lots of results.

Just undo lower radiator hose and let drain out. Reconnect, fill bottle with distilled water. Drive until thermostat opens, drop hose and repeat until all the coolant is out. Then fill with 50% gold motorcraft coolant, and distilled water for the remainder.

Edit: Steve you win. Tried to rep, but I must share the love.

 

Thanks for the link, I'm going to try to do it this weekend.

 

1. Drain coolant
2. Add 2 cans of VC-9 and top off with distilled water.
3. Drive 20 to 30 miles, preferably at highway speeds.
4. Drain radiator at petcock first, then pull lower hose. Then remove block plug on driver side. Not necesary to do passenger side.
5. Remove t-stat. To do this, remove air cleaner. Then 2 nuts on t-stat housing. Pry press. sensor bracket off of studs. Tight fit but it will move. Remove 2 more nuts and pull t-stat and housing from studs.
6. Remove t-stat and put housing back on. Re-assemble everything and fill with distilled water.
7. Run at 1200 rpm's for 3 to 5 minutes and drain as described in step 4.
8. Repeat 4 to 5 times or untill water coming at is as clear as water going in.
9. Install t-stat using new O ring. I used vaseline to hold the O ring in place.
10. After everything is re-assembled fill with a 50/50 mix of Ford premium gold or Zerex GO-5.
11. Start engine and check for leaks. This is a lot easier and quicker than it sounds. If you don't remove t-stat then you have to run truck between each flush till t-stat fully opens and then let cool down to work on it.

Highly recommend installing coolant filter kit while cooling syatem is empty. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
<o></o>

 

https://www.ford-trucks.com/forums/9...nge-101-a.html

This should have all the information you should need to do it correctly, whether you keep the T-stat in or remove it during the "flush".