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Flush cooloing system
#1
The coolant (50-50 anti-freeze and water) needs to be flushed out and replaced.

Any advice on how to do it??

I have Crusader gas engines with heat exchangers.
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#2
My college chemistry professor said "antifreeze never goes bad, only the rust inhibitor wears out". In my 50 years of boat and car ownership I have never replaced antifreeze, just added rust inhibitor once a year. And I keep boats and cars over 10 years and never had a problem. I buy it in the autoparts store, looks like milk.

Capt. George
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