[kaptain]

Joe,

THOSE ARE NOT BOTH COOLANT TANKS!  The round one is a coolant overflow tank…but the metal box one is hydraulic fluid.


The subject of what coolant that you should use is complicated.  Other folks can explain…but the metal one is the fluid for your fan, and power steering.

When you add fluid, you add the coolant to the tank that is mounted above the round one.  Look for a door on the outside of the coach above radiator.

Bill

thank you very much! I almost made a disastrous mistake.

I just found the inlet for adding the coolant.