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1982 2001 gm350 running cold |
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Skifreek 
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Joined: May-05-2020 Location: California Status: Offline Points: 4 |
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 Topic: 1982 2001 gm350 running coldPosted: June-05-2021 at 5:17pm |
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I just replaced my impeller after it blew up. Removed the whole water system and flushed the entire system out. I installed a new thermostat and impeller and now the boat will not get above 100* at 3000rpm. I put the new pcm thermostat in that has an operating temp of 170*. The new thermostat doesn’t have any sort of diaphragm in which seemed weird. I checked the part # and it’s correct. My head is hurting trying to figure this out. The boat runs a little bit rough at that temp so I’m not cool running it. Any advice would be great! Courtney
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 10857 |
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Posted: June-05-2021 at 6:07pm |
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It sounds like your new thermostat and your old one aren't the same and maybe the new one is bypassing a lot of water. Do they look the same?
What kind of cooling system do you have? Raw water cooling or antifreeze with a heat exchanger? Do you still have the old thermostat, so you could try putting it back in or was it bad for some reason? What's the part number of your new one? What was the temperature rating of the old one? Questions, questions  |
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Skifreek
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Posted: June-05-2021 at 6:26pm |
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It’s the same one they just don’t make the 140 thermostat any more, the new part is a 170. I have a raw water system. There is no diaphragm in the new or the old one. Is there a chance it’s upside down?
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KENO
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Posted: June-05-2021 at 6:30pm |
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How about a picture or a link or a part number to what you bought?
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Skifreek
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Posted: June-05-2021 at 6:33pm |
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Part# RP026003
I don’t know how to do pics on here |
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KENO
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Posted: June-05-2021 at 6:57pm |
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Seems like it should bolt right in.
Do you still have the old one or is it in a landfill somewhere?
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