Check the temp of your boiler. If its hot (I think its 120ish) your plugged or a leak. I replaced with a Amish built. Would recommend them. If you do pull unit replaced your ice maker water line while its out.
I have a Freightliner C-7. I drains radiator to changed the lower radiator hose. Tested coolant and it is in great shape. So how do you refill? It has no radiator cap.
Do I just keep filling reservoir? Thanks for any help.