Hello all. I have read here that vinegar seems to be a popular liquid to flush the block to try and remove some rust scale build-up. Im going to be installing a new rad on my 19 Touring and think that this would be a good thing to do using the old rad. Here’s the question. What about food grade citric acid and water mix. Ratio to be determined. It has a more neutral PH than vinegar. Mercedes recommends this for their cars, and have a procedure. My concern is would be having to redo the freeze plugs, which is not a big deal, just a PITA. Thought please!
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