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re: "...but you're saying (in #2) that I should leave off the reservoir cap while it's heating up the first time and add coolant mix to top it up, as it gets drawn into the system?..."
Sure. Let it go through a complete cycle of heating up (for the first time, with the cabin heating set to full hot -- if there's a bubble caught, and it gets purged when the thermostat opens, there might be a little burp in the bottle -- you may want to keep the cap on very loosely to avoid a mess, but the burp will only occur the first time. Then top off to the proper mark, and close the cap tight. If all's well with the system, it should stay at the right cycle, going up and down within the marks from now on.
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