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  1. #1
    Join Date
    Apr 2019
    Posts
    1

    Default Overheating 2009 supra launch 21v

    Had my boat winterized and first day out. Battery needed a charge of course, but WAS NOT FULLY CHARGED when we left for the lake. Started well and ran fine but no accessories worked including ballast fill, stereo and then the boat started over heating. I assume I just need to fully charge the batteries but looking for some ideas. Thanks. Complete moron mechanic here.

  2. #2
    Join Date
    Dec 2015
    Location
    Lake Nottely, Blairsville, GA
    Posts
    1,247

    Default

    I’d check impeller first for the over heating issue along with the thermostat if need be.
    If accessories aren’t working, I’d be looking a breaker or two that has tripped.

    1983 Supra Rider aka Mischief IV
    1983 Supra Beast
    1985 Supra Rider
    1986 Supra Sunsport Skier
    1987 Supra Marauder
    1991 Supra Comp ts6m
    2012 Supra Sunsport 242

  3. #3
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
    Posts
    2,742

    Default

    Pull the dipstick and make sure there is no water in the oil?

  4. #4
    Join Date
    Aug 2009
    Location
    London, Ontario, Canada
    Posts
    1,187

    Default

    Can you give us more info as to when, how , it overheats. How long have you had the boat
    2009 21v Worlds 340 Cat
    run your engine after you change the oil
    Doug

  5. #5

    Default

    When the engine is running you'll always have the voltage you need to power the gauges unless the alternator is going out but that won't have anything to do with the overheating because the water pump is mechanically connected to the engine. If the engine is spinning then so is the pump.

    Was there much water in the bilge? I've gotten hot because a hose blew off. You could also get warm if there's a plug that hasn't been screwed back in.

    Lastly there's the thermostat test which is pretty easy. Pull the thermostat out, place it in water on the stove, stick a meat thermometer in the water, and turn on full. When the thermostat starts moving look at the temperature, and it should be around 165°F. If it's not opening then the thermometer is stuck

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