Hi Home Skillet,
Found the plugs, the one on the drivers side (left side) was at the rear below the manifold (as you indicated), and was easy to remove.
But the right side (passenger) was in the middle behind the engine mounting.
I could not get anything in the undo this one, so I reverted to flushing several times and then draining the one side, including the oil cooler unit.
I ended up with some 5L of water left in the block.
I then added the correct amount of antifreeze (for 27.9L) and distilled water.
Ran the engine several times, with the heater full bore..... no air locks ... top up the water ....Job done.
Over here we aren't allowed to drain it into the storm sewer system.
It must be captured and taken to a disposal site.
Is your country the same?
2004 Monaco
La Palma 36DBD
Two Slides
2 Potties
Workhorse 22 chassis
8.1 gas engine & Allison transmission
6.9 MPG based on a 6,000 mile trip around the U.S.
Well, over here it not as strict, but I took mine to a friend who works in a garage to dispose of. The flushing water I lost down the sewer / fresh water systems!!!