Its time to change out my coolant and I'm wanting to do a complete flush before putting in the new. What coolant flush works best? Who supplies it?

 

If your not experiencing any oil cooler problems, eot/ect spreads over 15 degrees, I'd just do a fresh water flush and then refill with a 50/50 mix of G-05 or Ford Gold coolant. A chemical flush could possibly bust enough debris loose to plug your oil cooler.

 

My cooler went about 6/7 years ago. Got lucky and caught it before it got the heads!!!!! I installed the BPD external cooler and BPD egr delete then. Was thinking more on the line of the rest of the cooling system. With just over 206k miles figured it would be a good idea to do a chemical flush.

 

What coolant are you using now?

 

The kind you're not suppose to!!!!!!!!!! Prestone green coolant. I was told it was designed to be compatible with the Ford coolant. After reading several post about proper coolant types and t'stats, I'm realizing this info is not correct. Been using it since the oil cooler exchange! I'm not having any issues with cooling other than my temps not getting out of the mid 170s. Going to replace the t'stat when replacing coolant.

 

When I flushed out the Ford Gold to put in ELC Red, it took 5 flushes with Distilled Water (from WalMart) to finally get rid of all color (I figured a Complete Flush).
Each drain will take 6 empty gallon jugs.
You don't actually need 30 empty jugs - just 6, then for the next drain use the 6 Distilled Water jugs after you empty them into the engine.

I did the method where engine is brought up to around 160-180* while the t-stat was removed.
Install new t-stat (Motorcraft 192*) before filling with ELC Red.
(Plan on 3-4 hours to drain, run, fill, drain, run, fill, etc)

 

If the stat is removed you shouldn't have to wait that long with the water. Empty it.... and refill. Run truck for 5 minutes and drain. It doesn't have to get hot as the thermostat isn't sitting there closed.... the water just runs thru. Keep doing it until it runs clear with house water, then use your 6 gal of distilled. Re-install thermostat and pour in full strength GO-5 or Fold gold or the ELC until full (to the bottom line on the tank.

 

Agree 100%. Only need to worry about getting up to temp. if the t-stat is in and doing chemical flush. The chemical needs the heat to work at it's best.

 

Oops, my memory failed me again !! I did my flush about 8 months ago.

You're absolutely correct about Not needing to reach operating temp when t-stat removed.

I wasn't comfortable running engine with my high mineral content well water, so used Distilled for every flush (cost 'bout $32.00 - so no big deal).