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  1. #1
    Join Date
    Feb 2018
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    Indiana
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    Default 07 LVS running teperature?

    I have an 07 LVS and the running temperature seems to be right around 180 on mid-summer days. Is this normal? Also, when I am at idle speed the temperature seems to go over 180 briefly until I get going a bit more than idle speed, then it comes down. Could this be an impeller issue?

  2. #2
    Join Date
    May 2009
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    North End Lake Lanier GA
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    You running a little hotter then you should.

    You should be right at 160 most of the time.

    It could be an impeller, it could be a stuck thermostat. Its probably stuck half half to 3/4 open, I would lean more towards the thermostat because technically when impellers start to fail, the fail completely and you overheat.
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  3. #3
    Join Date
    Oct 2013
    Location
    Ft. Collins, CO
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    688

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    I agree with mmandley that you should be around 160, but I've been through thermostats and impellers on ours and it always runs a needle or two below 180 on the gauge. I haven't investigated the sensor or gauge and finally just accepted this as our normal operating condition.
    2007 Mobius LSV
    1989 Sanger Skier DX - sold

  4. #4
    Join Date
    May 2010
    Location
    Salt Lake City, Utah
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    1,693

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    My 07 LSV runs dead on 180 and has for years. At idle is actually drops a little lower. I replaced my thermostat a few years ago just out of precaution and the temp stayed the same. You could change the impeller and the thermostat just to be safe, especially if you don't know when they were last done. They aren't too expensive or hard to replace either one.
    Scott
    2021 Craz
    2007 Mobius LSV
    1997 Sea Ray 190

  5. #5
    Join Date
    Mar 2003
    Location
    Springfield Missouri
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    3,391

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    The impeller is only effective at low speeds so any speed while on plane would be hydrostatic pressure and the water flow would just be a pass through the impeller assembly. If the temperature rise occurred while at idle then the impeller could be suspect.
    1998 Mobius
    310 HP PCM
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  6. #6
    Join Date
    Aug 2015
    Location
    Spokane, WA
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    262

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    Freshwater cooled engines run considerably colder than their automotive counterparts as they are receiving a continuous supply of fresh cold water. However, a warmer running engine will perform better and be more efficient than a cooler engine. Your typical automobile engine runs between 195 210 degrees.

    The optimal operating temperature for the GM vortec is between 200-212 degrees.

    However, I would definitely check/replace your impeller to prevent a catastrophic failure. In addition, check with enginenut on the forum here.

    I’ve actually considered swapping my thermostat to a 180 degree stat.

    Definitely check with enginenut!


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    2008 Moomba Mobius LSV

  7. #7
    Join Date
    May 2013
    Location
    Fairfax, VA :(
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    925

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    I have run a needle below 180 as well for years. I removed two elbows from my water intake and it runs a few degrees cooler now.
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  8. #8
    Join Date
    Jul 2002
    Location
    London Ontario Canada
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    Quote Originally Posted by Aondion View Post
    I have an 07 LVS and the running temperature seems to be right around 180 on mid-summer days. Is this normal? Also, when I am at idle speed the temperature seems to go over 180 briefly until I get going a bit more than idle speed, then it comes down. Could this be an impeller issue?
    It is normal for the engine to briefly go over the thermostat temp when it is brought down to idle due to the heat sink nature of a hot engine and the short lag response time in tstat increasing its opening. Mine does the exact same thing
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