This is a very basic water flow diagram for the RV. Getting water at some locations and not the other is very strange. Hope you didn't rupture a water line somewhere when blowing out the lines with high pressure air... Perhaps your bathroom line is frozen... Use an hair dryer with caution on the line here perhaps...
Google Image
I blow my lines out with a very low pressure output using a tankless 12VDC portable air compressor. I used an air adapter at the city water input port.
I am able to walk around to all of my faucets and open each one at a time to drain out the water and eventually get air only coming through the lines. The air pressure probably never got higher that 20 lbs or so...
I would open some cabinet doors and following the water lines looking for a water leak...
Roy Ken
