RPGR90s Posted yesterday at 05:02 PM Report Share Posted yesterday at 05:02 PM I have a question. The other day I wanted to do a coolant flush on my 2019 ST. The car was purchased now and currently has 103k miles. It's been a perfectly flawless vehicle. At the 1st coolant service, I had the Ford dealer flush and re-fill. They swapped out the original orange colored coolant for a green colored coolant. Now I see that the latest Ford coolant is yellow colored, so that's what I purchased. I found the drain (boy what a fun job it is getting access to THAT!!) and drained the old coolant. I then added a coolant flush with distilled water and let the car come up to temperature. I ran this for the specified interval (10 minutes) and drained again. The liquid coming out was mostly clear so I filled the tank with the new, yellow colored coolant and brought the engine back up to temperature. I let the car cool down over-nite and in the morning the tank was a bit low, so I topped it off. But what caught my eye was the coolant reverted back to a solid green color. Did I miss a step in my probess and possibly not get all the old coolant out? Thanks for any advice or direction. RPG Quote Link to comment Share on other sites More sharing options...
1004ron Posted yesterday at 05:43 PM Report Share Posted yesterday at 05:43 PM Running the coolant flush for only 10 mins would not have warmed up enough to open the thermostat and you should set the cabin heating to MAX for it to circulate through it. Quote Link to comment Share on other sites More sharing options...
RPGR90s Posted 21 hours ago Author Report Share Posted 21 hours ago 3 hours ago, 1004ron said: Running the coolant flush for only 10 mins would not have warmed up enough to open the thermostat and you should set the cabin heating to MAX for it to circulate through it. If I recall, the engine was already at max temperature and I did have the heat set to Max. Thank You! Quote Link to comment Share on other sites More sharing options...
Samurai Edge Posted 1 hour ago Report Share Posted 1 hour ago Just remember you are not completely draining the coolant from the engine with a normal flush. Old coolant will still reside in the engine so this may be the cause of your " green "coolant. Quote Link to comment Share on other sites More sharing options...
1004ron Posted 1 hour ago Report Share Posted 1 hour ago The only way to get only the new coolant in the system is to do a few drain-fills with distilled water and then the final fill with a higher concentration of the new coolant expecting some distilled water to remain in the engine. Quote Link to comment Share on other sites More sharing options...
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