Overheating alarm on SeaRay Sundeck 220 I have 2010 SeaRay Sundeck 220 with a 5.0L MPI Engine. I keep going into an over temperature alarm when I am running 3,000 RPM and above. The alarm does not occur when operating under 3,000 RPM. Everything seems to check out fine. My water pressure is 16.4 psi, my H20 Pressure is 12.9 psi and my engine operating temperature never get above 165 degree's. It normally is between 156-160 degree's when it goes into over temperature alarm and puts the boat into "limp" or "safety" mode. Returning to throttle to neutral for only a few seconds clears the alarm. I can then operate the boat in a non alarm condition until I hit 3,000 RPM's or above and then I get the over temperature alarm typically in less than a minute. All of the engines components are original. Water pump impeller has been replaced 2xs. Bought is serviced by the book every year. Had it to a certified Mercruiser repair facility and they found nothing wrong. Probably because they did not do what I told them to do...operate the boat over 3,000 RPM's and wait for the alarm. Heading on vacation on 7/21 and want to get my boat running. I am mechanically inclined and can pretty much do anything. Just need help trouble shooting this problem. Temperature sensor? I say no because my operating temperature is in normal range. Exhaust manifolds and risers? Maybe...they are 7 years old but my pressures seem normal....lost.