Hello all looking for some help. Just bought a 05 Moomba Mobius Lsv, after using the boat a few times it would overheat when not in gear. Running full out temp is fine but as soon as I put in neutral it overheated. I replaced the impeller, cleaned the water filters and now replaced the thermostat with with one I found on a Forum the Sierra 18-3649. When I used it yesterday it didn’t overheat but temp was steady at 180. The thermostat is supposed to be 160. Can anyone advise?