[C320-list] Overheating Perkins Perama M30

[Donald Poole]

First time out  in my recently purchased 1994 Catalina 320 (#0047). I had
checked all fluids ( Oil, Transmission, Cooling water) before starting the
engine. The coolant was low ( I had had most of  the engine hoses replaced
so I was not that surprised). After motoring about 10 minutes I noticed my
engine heating up. Rose to ~220F.  I shut it down, let it cool, then
checked the coolant level again. It was low. Started the engine and added
coolant with engine running assuming I had air in the system. Once full I
recapped and continued to run. Engine crept up to 200F at a 1500-1800RPM
idle. Oh yes, I did check the raw water/exhaust discharge first and it
appeared to be fine. A good bit of warm water exiting. I had also had the
raw water pump impeller replaced when they did the hoses. Looking for
suggestions as to what to check next.