Re: CLR to clean out Engine Waterways

Posted by John Wallis On 2010/12/3 16:31:23

There are several "radiator flush" products on the market...Prestone, DuPont etc that are safe for most metals. I usually add them in the recommended amount and drive for several miles and then flush, refill with fresh water, drive and flush a second time before refilling with antifreeze.

A lot of crud comes out after the first and second flush. Also, drain by removing the lower rad hose as opposed to the drain-cock....lets the big chunks flow out better.