Join Date: May 2007
Location: Glen Cove, NY
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Re: atomic 4 cooling system
You probably need something stronger than vinegar or CLR - like oxalic or muriatic acid.
Here's a link to the procedure from Moyer's A4 website.
Procedure for acid flushing and pressure flushing - Moyer Marine Atomic 4 Community - Home of the Afourians