Originally Posted by Wayne&Sam
Nope. All I do is blow out the lines well and put pink in the traps. Even if a bit of water remains, there will be plenty of room for it to expand and not break anything. I've been doing it that way for years and it gets below zero here in the winter.
ha! not so, with my pump. (and it may be just "mine"...others might be differently designed, etc).
I've had to replace the pressure switch on my pump TWICE.
and no, I'm apparently NOT smart enough to learn from the first experience.
The first time, I just did as the manual said, which was just to open the drains, and raise and lower the tongue jack to make sure everything drains.
Thats fine for the pipes, but...not the pump. (maybe the original pumps weren't so sensitive).
Second time...well, I just didn't get around to it, and we had an early cold-snap.
Anyway, both times, a tiny amount of water from behind the pressure switch swelled up when frozen, and pushed the switch housing away from the body of the pump. The weak spot that gave way was around one of the screw holes. screw held in place, but the plastic housing cracked around it.
There's no way that running the pump "dry" is ever going to get every bit of water out; the only way to do that is to replace it with something that won't freeze.
This year, I totally have the problem licked. I removed all the pipes.
(actually, as I type this...I realize that the pump is still out there, and I can't pump antifreeze through it, because it has no place to go, so I'd better just remove it from the trailer and bring it in the house).