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I've been looking for a way to change/calibrate the water temperature on my 2019 23' LSV. There is no way to calibrate it, apparently it should be reading correctly. My air temperature is calibrated relatively accurately but the water temp is way off. Malibu responded by saying I should disconnect the transducer and only use the paddle wheel. The paddle wheel should pick up the temperature. I guess this means the transducer is not functioning correctly. Anyone have this issue? Also, why can't you get answers from the dealers or service techs? They look at you like you have 3 heads.

This is my first time posting to this board and I have read quite a few posts about temperatures and overheating but I wanted to get a little more clarification on what is normal behavior. I recently purchased a 2008 Malibu Wakesetter VLX (5.7 Indmar Monsoon 340) this summer and the first time out I had some issues overheating. The boat entered "limp" mode that restricted rpms on the engine and temperature got hot enough to melt the plastic elbows where the hoses connect to the exhaust. I don't know what the exact temperature the boat reached at this time but I did not run it too long when it got hot and once the elbows melted we shut everything off and got towed into dock. After that incident I took the boat into a local marine shop and they replaced the elbows with brass elbows and replaced my impeller because there was a tear in it and they believed that would fix my overheating issues. After reading this forum I decided to buy a new 160* thermostat replacement and replaced the thermostat myself because it was easy enough and cheap enough to do. (I also tried testing as some suggested by putting the thermostat in a pot of water and see if it functions correctly but saw no noticeable difference when it got up to temperature. I don't understand what part "opens and closes" on it.) Anyway I assumed the new part I bought was good and installed it. Yesterday I took the boat out and would watch the temperature gauge on the boat fluctuate a lot between 160-200. It would never stay around 200 very long and would go back down to 160-170 range and then climb back up. So I don't know if this means that I have a faulty gauge and that worries me because then I don't know how hot it actually is. I know it once beeped and let me know that it had reached 201* but that happened for about 2 seconds before it "cooled" again. Other than the gauge fluctuating a lot it seemed to perform fine as in I never entered "limp" mode. The exhausts I think are too hot to touch and if I splash some lake water on them after recently shutting down the engine the water sizzles. So my main questions here are: Does the temperature normally fluctuate like that? Do I have a problem here? If so, what other things should I do after my list below? For reference I live in altitude (~5280) and air temperature yesterday was 79* and water was 76*. If you guys agree that my temperature is a problem I would guess my next course of actions would be: Use IR gun to measure and see if gauge is accurate Check for blockage on the transcooler (I have sort of done this but not sure if there is a blockage where it would occur. Is it adequate to just disconnect the hose from the transcooler to the thermostat housing and inspect that or do I need to remove more than that and check?) Pull the circulation pump and inspect it Thanks for any help, Ryan