Hi Austin. I read a couple of your posts on this subject. I have used K&W
without your “leave it in for 500 miles” trick. I plan to repeat and leave
it in, but 2 things are puzzling me.
1. Does the thermostat really need to be removed? and if so do you leave it
out for the 500 miles?
2. Does the antifreeze need to be completely removed (ie. repeated
flushings)? or will the product tolerate very low concentrations?
Thanks for your help…Bert
Hey there Bert
I do not suggest taking thermostat out, I think another visitor posted a comment about how he did it that way. The product will NOT work properly with any antifreeze in system, although I usually just remove lower radiator hose and flush out radiator as best I can and maybe flush out heater core depending if there really was a good mix of coolant to water to begin with.
You can check out my original post with my instructions here