my boat is overheating (1995 supersport nautique 5.8 ltr 351 pcm). ive checked everything. impeller, tranny cooler, strainer, hoses for blockage. i pulled the thermostat and boiled it in hot water to see if it was working. its a 160 thermo and it only seemed to open when the water was boiling. so i thought it was bad and i replaced it with an automotive thermostat. i called california correct craft and they said i shouldnt need an oem (pcm) thermo. i put the new thermo in and the boat got to about 190 and i turned it off. soo i pulled the thermo out all together and ran the boat one and it ran cool. 1) could i have gotten a bad termostat from the auto parts store 2)should i get an oem thermostat because an auto thermostat wont work for this application 3) could there be a sensor problem.
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I had a grounding problem. Try running a ground directly from the gauge to the negative battery post.
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i dont think that is my problem because when i removed the thermostat altogether the boat ran fine albeit cool.
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You can check #1 by putting the tstats in a pan of hot water on the stove w/ temp guage to know when it pops. I believe its fairly common to get a bad one.
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190 is fine. that is a common running temp. the marine thermostat is a 160 however. that is the difference between the automotive and marine is the opening temp. i don't think you would find a 160 in an automotive parts store. again, 190 is fine if the temp stays there.
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Do you still have the stupid nautique strainer, if that has any crack, an airleak in the o-ring, anything at all the boat will over heat like crazy, just rip the strainer out and run the water straight from intake to impeller housing... the strainer screws everything up
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hey sparky i did find a 160 at an auto parts store(checker). if the boat stayed at 190 at idle i wouldnt have a problem with that however it gets over 220. in az i run the boat in water temps over 90 degrees. <BR> <BR>i drilled 1, 1/8" hole on each side of the flange and that seemed to help alot. <BR> <BR> <BR>nick i have tons of hydrilla in lake i cant afford to not run the strainer
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