Mattmartha

Thank you all for your help. Much appreciated!!

Just purchased a 2014 Tiffin 33aa with a 8k (HDKAK model - series M) Onan diesel generator. It has 57 hours on it and since its 2 yrs old and I am not clear as to past maintenance, I want to flush and change the radiator fluid as well as replace the radiator cap. I am clear on the procedural steps on flushing and replacing the 50/50 anti freeze. What I need your help on is how full should I fill the overfill recovery tank? It's has a min (cold) mark and a max (hot) mark but surely I need to fill it somewhere in between, right? Lastly, at Napa Autoparts, I can find a 13 psi rated cap but not the recommended 14psi cap. They have a 15psi cap but I don't think that's the way to go. I appreciate any help. Thank you