Originally Posted by Whbcrna
We have a Thor Citation and are just now getting ready for a trip. I de-winterized everything correctly I think, but when I turn on the water pump and turn on the water it pump rattles something fierce. What did I do wrong?
Another thing to look for is a selector valve in the water line near the pump inlet. Many motorhomes have a "winterizing valve" that directs the input line to the pump from the fresh water tank to a line that can be put in a bottle of RV antifreeze. If you have this valve and it's in the "winterize " position it's trying to suck water from the wrong place.
Our winterizing line has a screw on cap that's installed on the end after the antifreeze has been pulled into the fresh water lines. The cap prevents antifreeze from flowing out the tube. It also doesn't allow anything to be drawn through the tube.
The pump will make all kinds of noise if it's either drawing air or trying to suck water through the capped line. Unless you do it for hours I doubt you'll hurt the pump. It's "self priming" so it can handle running dry for a short period of time.