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Response with LS1 runs warm at top speed


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I had the same issue on my 2001 23 LSV with the LS1. I replaced the impeller and thermostat. I cleaned out some debris from cooler, just down stream from the impeller and then topped off the coolant. Now it runs good. The thermostat is a 160 degree thermostat and it keeps the engine running right about 160. If I am in neutral, it will ease up to 180, maybe 200, but then comes right back down. I should also mention that the serpentine belt broke right about the same time, so I replaced that. It may have been slipping prior to the breakage, leading to poor impeller and water pump speeds, but I doubt it. Good luck!

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I replaced the impeller, running 50mph the temp got to 230 deg. Is this normal??

50 mph...a real corvette on water,,,,need to try that some day ;-)

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Previous owner must of smoked the old impeller. I found it in pieces before the tranny cooler. Thanks for the tip. I should have known this a friend had the same issue with his boat.

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