Quote:
Originally Posted by dude99
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Dave has great vids, but I would skip using any chemicals until you try plain water first. These heater cores are old and burst just from normal use. I wouldn't put anything stronger than vinegar in one of them. That said, I'd need to flush with water a couple times before I even thought about using even vinegar. Heater core R&R is such a PITA that it should be avoided at all cost. I did it once on my 84 190D. The only way I'm taking the dash out again is for a crack free 87+ replacement.