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Old 10-28-2022, 07:16 PM   #15
lousyflyer
Senior Member
 
Join Date: Oct 2013
Location: Garden City, GA
Posts: 294
Re: Sludge in coolant, high pressure

I just went through this on a car I bought that had been treated with a block sealer. The crud had accumulated in the bottom of the radiator. I flushed it with prestone system cleaner and all hell broke loose.

My crud looked exactly like yours. The system was full of it. Including the heater core.
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