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sabathfan
09-27-2003, 01:06 AM
does anyone have any suggestions? I have a 72 howard 16 foot jet boat running a 454 chevy,boat ran fine for about 6 years and all of a sudden now the temp is erratic all the time,it will climb into the 230 ,240 range than cool down to 120 110 area never keeping a steady temp.has anyone ever had this problem before and find a solution? any suggesstions would be appreciated thank you.

KC462
10-01-2003, 10:19 AM
Sounds like you may have an intake manifold leak thats causing the overheat problems. You might also check your thermostat probe and make sure it doesn't have a bunch of oxidation or junk all over it from the lake or river water you run through it. It can cause the probe to give false readings.

WATERWINGS
10-01-2003, 11:33 AM
Have you backed up the temp reading with an infrared thermeter?

Is it possible that you have a bad guage, or a loose wire, or gorund?