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Boat gets hot


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I have never had an overheating problem with my boat. It is a 1999 Sunsetter LXi. Yesterday I went to an area with a lot of weeds. After that I noticed my temp was at 240. When I idled down the temp went to 160, then when the RPM's went up the temp also shot back up. Could I have sucked up some weeds? If so what do I do to clean it out. Also, what type of thermostat do I need to buy, I figured I might as well replace it.

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I have never had an overheating problem with my boat. It is a 1999 Sunsetter LXi. Yesterday I went to an area with a lot of weeds. After that I noticed my temp was at 240. When I idled down the temp went to 160, then when the RPM's went up the temp also shot back up. Could I have sucked up some weeds? If so what do I do to clean it out. Also, what type of thermostat do I need to buy, I figured I might as well replace it.

You probably have some weeds in the tranny cooler. Follow the hose out of the raw water pump to a large black cylinder with 2 hydraulic hoses in it. Pull the raw water hose off and pull the weeds out of the cooler.

If you are going to be in weedy areas a lot you can get a sea strainer from SkiDim.com

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You could have picked up weeds. Check the 2 hosesfrom thru-hull to the trans cooler & the impeller housing. The cooling tubes in the filter work like a strainer & collect most things that make it through the impeller.

The thermostat should be a 160 degree T-stat. Just be ready to spend a little time scraping & cleaning the old gaskets off the mating surfaces (took me 2 hours). Also be ready to look for new bolts, mine were REALLY corroded... You should look for a marine t-stat as they flow more than an auto one. The t-stat & gaskets were $16 at my local dealer.

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Well I checked the tranny cooler screen. I found a weed of two but nothing significant. I checked the impeller, it looks good. I checked the thermostat and it looks like it is the original one. It was really corroded, so even if it is working it is getting replaced.

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