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Old 07-05-2022, 11:20 PM #1
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Cold Engine Coolant Level

Curious what coolant level you like on a cold engine. Truck came with Coolant at the level Full line but I was getting overflow. I have my level now set right in the middle of Full and Low and no more overflow.

Last edited by Sonoran_Desert; 07-06-2022 at 03:22 PM.
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Old 07-05-2022, 11:25 PM #2
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Anywhere between Min and Max.


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Old 07-06-2022, 03:24 PM #3
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Thanks - seems others found the same.

I would like to find the time to read more about cooling systems in general. I remember some vehicles had a fan which ran even after the vehicle was turned off.
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Old 07-08-2022, 06:51 PM #4
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The radiator should be full (up to the neck) and the overflow reservoir should be at the full or max line when cold.

This is in the manual.
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Old 07-10-2022, 01:44 PM #5
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Don't overthink this.
Although the physics of the cooling system is complex, we need not go that far.

Basically the coolant expands as the engine warms up, the coolant goes thru the vacuum valve in the radiator cap and into the plastic overflow tank. The level will rise with a hot engine.
When the engine and coolant cool down and since the overflow hose is immersed in the overflow tank, a vacuum is created and the coolant is sucked back into the radiator/expansion tank.
This back and forth movement insures that the radiator/expansion tank is always completely full and void of an air.
It also insures that coolant is no longer spilled onto the ground.

And this is why the overflow tank should always have coolant covering the overflow hose, preferably at least at the min level, but not so much that it runs over to the ground.
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Old 07-10-2022, 04:04 PM #6
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Decided to actually find it for you. Pages 412 and 514 of the owner's manual.

2021 Toyota 4runner Manuals & Warranties | Toyota Owners
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Old 07-11-2022, 02:16 AM #7
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Thanks for the quick chalk talk.
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Old 07-11-2022, 02:16 AM #8
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Owner's manual is clear and thanks for finding the pages.
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