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International Automotive Technicians Network
Re: Plugged heater core
Posted to Technical Discussion Forum on 1/16/2018

It looks like a mixture of non compatible antifreezes such as Dexcool mixed with the old green antifreeze or the addition of cooling system stop leaks or sealers. This problem was created by someone using the wrong stuff! It will take an acid flush of the enti... Login to read more.