Indmar 400 Thermostat

[HFarr]

My 2021 400 ran hot on me several different times this weekend. Got as high as 230 f briefly. It triggered limp mode on me. It would quickly cool back down, though. It did this several times, and mostly when I was at idle speed. I cleaned the sea strainer, which was not bad at all, and the coolant level is fine. I don't really suspect an impeller issue because it goes up and down. I would think a bad impeller wouldn't cool back down. By the end of the day, it was pretty well maintaining temp at about 160-170 with no issues. I suspect the thermostat and plan on changing it to be safe. Have any of you changed out the thermostat on your raptor 400 or 450? If so, what thermostat did you use if not the official part offered by indmar for $232.00. LOL! They are nuts!

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[Holdmybeer]

Go to the local auto store and get a 165* or 150* thermostat for a 2012 Ford raptor 6.2.

Same exact thing.

Or....

https://bakesonline.com/products/ind...ermostat?gQT=2

[HFarr]

Yeah. I saw the Bakes you linked to. Also that it's out of stock. I wasn't sure about the length on the ones at Advanced, Autozone , etc...compared to the boat in case there was a particular year model. I didn't know if the housings may differ slightly. Also, is there a gasket or o-ring seal? I have not taken my old one off yet, but wanted to go ahead and have the new one handy when I did to just speed up the repair. Thanks for the advice. And $14 range is what I am used to a thermostat costing! Not the crazy $232 LOL

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[Holdmybeer]

I cannot answer specific on the indmar 6.2 but I have worked on a 6.2 raptor f150.

The housing look the same and it should be an o-ring seal. The new thermostat should come with the o-ring. 160* is what you want.

Motorcraft is around $60 for it.

[HFarr]

Thanks! I thought it was probably an o-ring style, but again, never having taken the one off the boat, I wasn't sure if there might have been a different design or shape on the neck for some reason. It's one of those things that you don't really look at until you have too.

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[HFarr]

Well....thermostat didn't do it. I will change the impeller next. Strange how it will run fine for a while and then run high, then drop again. My experience with impeller is they just run hot. Anyone have any other ideas?

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[Holdmybeer]

You could have air in the system.

Is your heater leaking or allowing air in the system?

[HFarr]

I do see a slight bit of wetness around the bottom of the heater where it mounts to the floor. Hoses and fittings are clean and dry, so there could be a small leak that is seeping. My coolant level was at the minimum mark. I will add some and see what happens.

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[HFarr]

Now I have another issue that just started last night! The fuel, depth, speed, rpm, and autowake all go blank. They will randomly come on and go off. When off, it tells me to see a dealer to have auto wake installed if I select that tab. I jiggled all the wires I could find, hoping something was loose, but no effect. Has anyone else had this happen? Oh, and my temp reading goes to 32 when it happens.

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[Dukabor]

Damn…. Early season bugs to get out of the way it appears….

Not sure if it will help but when my wake plates had a mind of their own I disconnected the batteries for about 30 minutes and it appeared to reset the system