Ok, so I think I figured out my cooling problem but in the process I broke a part. It is part of the fuel system and iBoats is just calling it a tank. Part number is 3854149. Engine model is 7.4 GIPWTR, serial number is 4110176452. I realize I can buy it from iBoats but if someone had a decent used one laying around they wanted to get rid of please let me know.
Link to diagram: http://www.volvopentastore.com/mall/.../12105_big.png
I need part # 20
If anybody has a bright idea on how I can fix that would be great too. Basically I snapped off the nipple on the "water out" side trying to get the hose off.