Had an ok day fishing. time to pack up and go home. about 10 miles from the ramp. jump up on plane and running 60 mph for about 5 minutes. and the warning horn goes off. look at my guage and see the temp light on. water pressure is at 0. shut it down to let it cool off. i trim it all the way up to see if the pick ups are clear, they are good. get on the front deck put the trolling motor on high for about 5 min and check motor horn. its now off, great. start it up check for peeing, good. jump up on plane again and no issues, pressure is going up but slowly. now, water pressure is at 15 psi and climbing slowly going up to 20 while rpm's are steady. (where its normally at) it starts fluctuating between 15 and 20.
do ya'll think it's the water pump? i usually change it out every 2 years in january, and two years is coming up. or could it be a thermostat? i just never seen the wp rise so slowly and fluctuate like it did. motor was at normal running trim and my manual jack plate was not moved.