Part 2:
5. Optionally blow out the water lines:
I use an air compressor, set for about 10psi or so, and connect it to the city water inlet via a fitting:
The fitting goes into the City Water inlet, wherever that might be.
I then turn on the air compressor, and open each faucet, one at a time, first the hot water side, then the cold water side (vice versa), until no water comes out. I start with the faucet furthest from the water pump, and then each one in turn, until I get to the closest one... but then, I go back the other direction - opening each faucet individually until I am back at the furthest one.
Don't forget to do the shower, outside shower (if you have one), and toilet too.
And if you have one, the low point drain as well. In my coach, the low point drain is next to the water pump on the floor of the rig. There are valves here that dump the waterlines under the coach. These should be opened and air blown through them as well.
When done, close off the low point drain.
6. I then connect a jug of pink antifreeze to the antifreeze injection point in the RV.
There is a valve at the bottom of this fitting, so make sure you turn it on, otherwise, you will fill the water tank with antifreeze, and not the water lines.
Finally, turn the pump on, and turn each faucet on, both hot and cold (one at a time). This time though, start with the closest faucet and go to the end. Leave them on until antifreeze runs through the faucet.
Make sure you have closed the low-point drains before doing this.
Finally, dump some pink antifreeze in the toilet, shower drain, and sink drains to treat the "P" traps.
When you are done with this step, the RV is winterized.
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