My procedure is nearly identical with a couple of exceptions:
- I don't blow out the lines first
- After working each faucet with the system still pressurized I'll also crack open the low point drains for a sec to get some pink stuff in those valves, crack open the bypass valves on the water heater to get pink stuff there, and (with some reduced pressure in the system) tap the check valve on the city water inlet to make sure pink comes out there as well.
This way I know there is antifreeze everywhere.
(You want reduced pressure when you tap the check valve because it can be damaged if it "slams closed" too quickly--found that out the hard way in an older camper.)
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