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The hole(s) are there to allow air to escape when filling the cooling system.
Without the holes the engine could overheat because the traped air under the thermostat will not heat the element enuff for it to open untill the engine is over heated and then if it does open it will allow cold water to hit the hot engine parts, not so good.
I imagine a sea water cooled engine would have this problem every time it is started.
If you don't have a hole in your thermostat I think you should drill a small pin hole in it.
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Rick
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Mac 25
Copernicus
Southern California
I am not a prejudice racist sexist bigot. I just hate stupid people.
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