2004 Hunter 33 high temp alarm

leo310

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Dec 15, 2006
454
Catalina Catlina 310 Campbell River BC
you may want to check your thermostat it could be at fault
 

buddy0

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Sep 17, 2014
33
Hunter 33 Oriental, NC
Ouch! In 2019 I paid $713, including tax, from Deatons in Oriental.
I don't have the part number.
 
Jun 25, 2004
288
Hunter 306 Pasadena MD
On our 2004 Hunter (Yanmar 2GM20F) the only engine overheating I've experienced turned out to be because a vane had broken off the impeller and was partially obstructing the flow. When I noticed it was gone, I poked around, but basically I was too lazy: so at first, I just replaced the impeller. After one particularly scary time (the engine temp alarm went off in a high wind, high worry situation), I decided to pull all the hoses between the water pump and the heat exchanger. I found the chunk of rubber in the end-cap of the heat exchanger and removed it. No problem since then.

I believe you said it's a new-to-you boat, so maybe the PO had an impeller break up before you got it? It's pretty easy to check the heat exchanger.