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Old 06-07-2009, 04:16 PM
jdhunt0 jdhunt0 is offline
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Join Date: Aug 2008
Boat: 79 Hydrasport
Location: Southeast
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HELP! Temps running 180+

I bought a new to me '99 MariStar 210VRS with what I assume is an LTR late last year. The few times I had it in the water everything was fine. I winterized it myself with no problems as far as I could tell. Now this year the temps seem to be running high, around 170-180 on average.

I changed out the impeller before starting this season, but just pulled it to check anyway, it looks fine. I flushed the transmission cooler and there were no debris in there. I back fed the inlet on the bottom of the boat and it is fine.

Where do I look next? Can the thermostat be stuck? I'm stumped.

Last edited by jdhunt0; 06-07-2009 at 04:49 PM.
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Old 06-08-2009, 02:29 PM
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454Prostar190 454Prostar190 is offline
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Join Date: May 2007
Boat: Mastercraft, Stars and Stripes, 425hp/454 Chevrolet, Actual Marineworld/Africa USA Towboat
Location: San Francisco Bay Area
Posts: 587
I have an older boat but, 170 - 180 doesn't sound that warm. If there were a 180 degree thermostat installed, that would seem to be normal.
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Old 06-08-2009, 02:32 PM
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flipper flipper is offline
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Join Date: Mar 2005
Boat: 1991 Prostar 190, fuel injected 302
Location: Under the radar
Posts: 5,083
Pull your thermostat and see if that makes a difference. Yes, it can be stuck
Lots of power is good, more is better, too much is just right.

'91 prostar 190
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Old 06-08-2009, 03:02 PM
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Join Date: Jul 2008
Boat: 1987 PROSTAR 190
Location: Alabama
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I bought a new to me 87 PS last year and it was running in the 180's too. When I pulled the thermostat to winterize it I saw that the previous owner had put in a 180* stat. I ran it without one the first time out this year without any issues until my replacement (143*)got here from Skidim.
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