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I've drained and filled enough B21/23/230 Volvo cooling systems to last a lifetime, but I'm still alive, and probably will be doing cooling system maint. for years to come. The draining and refilling instructions by others are generally good - I've never done anything but fill the buttoned-up system via the reservoir...never a problem.
As said, just orient the new 'stat so the little jiggle pin and hole in its outer edge is at the highest position. This will bleed any air left in the upper reaches of the head. Like you, my recent dealer purchase was also a Wahler - a more robust looking unit than the Calorstat that I removed.
On my biennial maint. I always buy and use that Prestone HD Rad flush. Just follow the instructions on the container. Afterward, fill and drain the system repeatedly until the drained stuff runs clear...not just the block drain, the lower rad hose, too. Then dump in 4 litres/qts of quality antifreeze and top up with distilled water - yes, distilled water. Let sit a few minutes and top up again if needed (unlikely).
After a good run and cooldown, test the concentration of the coolant by draining a cupful from the block drain. Depending on results, top up the reservoir with what's needed to adjust the conc'n. It will probably be 50/50.
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Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar 77 MGB, and a few old motorcycles)
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