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2010 5.4 coolant flush

 
Old 06-05-2017, 10:37 AM
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Originally Posted by gypsyjoe11 View Post
Did you take the thermostat out and then re-attach the upper hose. I was thinking you might need to do that and then lift it up as you fill it in order to have gravity get you the pressure you needed.

Did it come out clear where the lower hose attaches?
It was pretty clear after I flushed it out. The second time I only drained the radiator. The coolant came out dark brown the second time. This is what I did:
Drained radiator
Replaced thermostat and gasket
Screwed thermostat housing back on
Filled radiator with distilled water
Turned truck on with heater on full
opened radiator drain
Poured 3 gallons of distilled water into radiator while truck was running/draining
Turned truck off
Filled with VC-1 and distilled water
Turned truck on, revved to 2500 rpm for about 15 mini with heat on full.
Drained radiator.
Refilled with 60/40 coolant mix.
Drove truck for a day.
Drained radiator again
Refilled with 50/50 mix

Not sure if it's the best way, but I hope I got most of the green coolant out.
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Old 06-05-2017, 10:20 PM
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Originally Posted by Gilberto Padilla View Post
......
Not sure if it's the best way, but I hope I got most of the green coolant out.
you did....guarantee it.
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Old 06-05-2017, 10:35 PM
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Thanks, I hope so.
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Old 04-01-2019, 09:54 PM
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Default Unsure if this worked

2010 5.4 F150. Opened the petcock, about 2 gal came out including the overflow tank. Filled with distilled water, ran about 15 min, drained and repeated. Drained until nothing came out of the petcock.
Used 50/50 and filled the radiator, burped the system, filled it again. Replaced the radiator cap. Filled the overflow and replaced the overflow cap. Ran for a while and added to the overflow.
I am concerned about the water remaining in the engine. Should I have used concentrate rather then 50/50? It has been two days and the coolant does not look like it has thinned out.
And why did I buy 5 gal of 50/50 when I only needed 2 gal?
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