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LS - 4th Gen (2007-2017) Discussion topics related to the current flagship models LS460, LS460L and LS600H

Overheating ?

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Old Jul 29, 2021 | 02:00 PM
  #1  
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Default Overheating ?

07 460 with 130,000 miles, radiator, fluid and thermostat replaced just a couple years ago.

I am noticing that the engine coolant display goes up alarmingly lately when accelerating.

And yes it does go back down when rpm's are steady.

I don't remember this happening or not prior to a couple months ago, senility?

Anyway, is this normal? Yes I do have adequate coolant, is this possibly a thermostat issue or what is this?

Thanks for your thoughts
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Old Jul 29, 2021 | 02:08 PM
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No, it is not normal. I think you are correct in believing this is a thermostat issue. My guess is the thermostat is stuck so at high rpm's it doesn't open enough to allow for proper flow of the coolant.
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Old Jul 29, 2021 | 02:32 PM
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colfax
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Paul, thank you for your reply.

What is strange is this happens just increasing the rpm's a little from say 1400 to around 1700 while going up a slight incline?
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Old Jul 29, 2021 | 07:51 PM
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Did you purge the cooling system off air? If you have an air pocket within the cooling system, it will cause overheating.
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