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Coolant flush for Low temp system

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Old Mar 21, 2026 | 09:16 AM
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marchgroupinc
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From: SW Ontario Canada
2020 GLS580, 2023 Corvette Z06
Coolant flush for Low temp system
Does anyone have the procedure to flush and vacuum fill the low temp coolant for the V8?
I can't find the drain and the spec for vacuum. I don't know if it unique to the 580 V8.
I posted this on the X167 site with no reply so far.
This is a pic of the coolant tank on top of the engine for this system which is separate from the other coolant Hi Temp system.

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Old Apr 8, 2026 | 09:41 AM
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marchgroupinc
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Joined: Dec 2013
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From: SW Ontario Canada
2020 GLS580, 2023 Corvette Z06
Check coolant for secondary low temp system
Does anyone check this coolant tank and do you need to add to it occasionally? Mine was empty so I want to flush the system. Anyone know where the drain is for this system? I can only find a video on an older S class and this is different.
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