overheat at idle

[skeeter72]

I have a 2006 Yahama 225 HDPI, and it has started alarming "overheat" when i idle for more than a couple of minutes.....
I recently had a new impeller/washers, etc, installed at a reputable marine dealer, and it began overheating shortly afterwards......the dealer said something about a PRV ( ?) valve sticking partially open.(I think?).....any ideas?

[99yam40]

good possibility

[boscoe99]

I third the pressure relief valve is the over temperature is at idle or low RPM's.

[greasyshaft]

Should be checked annually even though its a pain in the ass to get to