Temperature Fluctuation

[HFarr]

Does it fluctuate gradually over the course of several hours or is it actually moving up and down while you watch it.

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[zabooda]

If it is an instantaneous change, it would be a bad connection. RTD sensors vary in resistance with temperature with 0 to 100 ohms. Wiring with good connections at 1 ohm is insignificant. A corroded or loose connection will cause the wire resistance to go up much higher and a large error. Instantaneous changes is a loose connection and a continuous out of range reading could be the RTD but more likely a corroded connection.


https://www.te.com/usa-en/industries...ding-rtds.html

A major cause of error can be the resistance of the lead wires, especially in two lead configurations.

[Fossenrf]

Found my issue in the transmission cooler.C39B060E-4041-43C9-BD3F-F4FE6FE90096.jpg

[Holdmybeer]

Boat ok?
I'm hoping you didn't "find it" the hard way and now the season is gone.

[HFarr]

Looks like spinach. If your temp never went above 200, you are fine.

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[Fossenrf]

Temp gauge never went above 200, but I think the engine went into "limp mode" a couple times and would not let me accelerate until the temp came back down. Anything I should be worried there? It is going back in the water tonight to confirm that was the issue and that everything runs ok now. I also have already ordered the indmar strainer pro to make sure this doesn't happen again.

[Holdmybeer]

200 doesn't worry me. The lake water never enters the engine if you are closed loop cooling. The heat exchanger would be the gathering point. However, I thought the water pulled through the v-drive and Trans first so that makes sense that is where you found the clog. If anything I was worried about the transmission getting too hot. But most can handle way more than 200

[Fossenrf]

I don't have a v-drive, just a direct drive outback ls. Transmission is the only thing I am really worried about since temp gauge comes from the engine, but agree it should be fine.

[james yarosz]

Realy like to know if that fixes your problem.The lake i,m on is pretty weedy and ever year when I winterize I clean some weed out of the trans cooler,but its never made the temp fluctuate until I installed a new thermostat.

[Fossenrf]

I'll let you know hopefully tonight. Are you saying you started having the issue after you replaced the thermostat? Or that replacing the thermostat fixed the issue for you?