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Zoe R. 09-19-2013 08:01 PM

Prostar 190 runs cold
My 1999 Prostar 190 didn't have a thermostat in it so I bought a 160 degree for it as recommend by MC. When I took it out for a ski it shut the motor down to a idle. I went back and bought the 140 and it did the same. It seems that if the engine gets up to 160 degrees it shuts the computer down. I also replaced the sending unit in the head and still no change. The motor is running to cold to be efficient. Need help.

gotta_ski 09-20-2013 06:48 PM

This doesn't help, but at least you know why it didn't have one in it. Have you check your impeller to see if its ok and all your hoses for obstructions? Its easy and free. I'd start there.

CC2MC 09-23-2013 09:33 PM

Which engine do you have? I know that my 94 PS 205 with the LT-1 had a 240 degree thermostat gauge, if that is what you are referring to. IIRC, the operating temp was around 160ish or so. Mine did not run that warm however, and I never did figure out why. Not long after I changed the impeller, it started running cooler. I asked MC dealer about it and they said as long as it was not running the other direction, it was okay. I never had any trouble with the way it was running so I didn't really worry about it.

mikeg205 09-23-2013 09:47 PM

I wonder if the ECT sensor is bad.. different than the water temp sender.

CC2MC 09-23-2013 09:53 PM

ECT sensor would be a quick, easy and fairly inexpensive replacement.

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