My 09 33sk has the easy winterizing set up but when I followed the instructions in the manual I could not get the RV plumbing antifreeze sucked up from the jugs and into the system. I tried everything I could think of including looking for suction leaks, open valves etc but no way it would work. I ended up blowing all the lines out with air and dumping some RV antifreeze in the P-traps.
In my last 5th I had no problem doing the winterizing by sucking the antifreeze into the system using the water pump and pressurizing the system until it blew out through all the taps and toilet.
By the way I have never used the water pump as I have always been on city water hookup.
Anyone else run into this situation?