Does changing coolant loosen up junk in an abused cooling system? Kind of like cleaning out varnish / sludge in an engine.
For example a 10 year old engine on factory fill green. Would doing a couple of drain and refills over a term of a few months clean it up?
For example a 10 year old engine on factory fill green. Would doing a couple of drain and refills over a term of a few months clean it up?