"John Woodhall" wrote in message
...

snip

If your not sure then drain it and refill with fresh mix of 50/50
coolant/antifreeze and water. Don`t forget its the anti corrosive
properties
that you need as much as the anti freezing. Easy peasy and won`t cost the
earth.


With out knowing what car / engine you can't say that, some are real
*******s these days, and you need to know what you're doing if you're not
going to be left with air locks and local over heating of the engine...