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Greg,
Dunno if this fits your request for "Knowledgeable and helpful responses appreciated," but I'll share what I've done on Volvos for many years. It's only a bit different fron your approach and I've used it on 200s, an S70 and my current S80 T6. First, being able to drain only half the capacity is normal for Volvos so that's good news for you. Don't look for a problem. After the drain, I run tap water thru it until it's clear. I understand what you are trying to do with the distilled water but with my tap water, I don't do that. However, if I were trying to get the tap water out I would fill the other half with distilled, run the engine until the thermostat opens and drain again as many times as you wish (each time cutting the tap water content by 50%). BTW, the heater core is always on so no need to be concerned about having the heat on. After the last drain, I blow a little low pressure air into the overflow reservoir using my hand as a cap to get the remaining water down to 50% capacity for sure, and then, of course, refill with straight antifreeze to get to the 50/50 mix. The folks trying to do this by adding premixed are in trouble.
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