Sludgy Coolant, 2001 Ford Windstar

[Peteco]

Getting my in-laws van current on its maintenance. Coolant hadn't been change in a LONG time, as evidence by the state of the coolant. Wondering how far I should go with a flush.

I plan to flush with water until water is clear. Then should I run some coolant flush like Prestone Radiator Flush and Cleaner? I'm worried that might dislodge some sludge or corrosion that is keeping it from leaking.

So is it best to just do the water flush and refill with coolant?

 

[slacktide_bitog]

Do the radiator cleaner flush first, then do a few clear water flushes until it's clear, then fill with G05 coolant

 

[melk]

Recently did my 99 Ford. Drained it, fill with the Prestone stuff + water and drove it about half-hour, then from there just water + idle until its running clean.