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LS - 3rd Gen (2001-2006) Discussion topics related to the flagship Lexus LS430

Radiator Flush

Old Jun 25, 2025 | 01:37 PM
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Default Radiator Flush

To flush my 2002 LS430 cooling system, I’m using the Prestone Flush n Fill Kit. Is Hose 1 the proper hose to cut and install the T?
Is Arrow 1 a good spot to cut and install the Prestone Flush n Fill T or is this the wrong hose?
Is Arrow 1 a good spot to cut and install the Prestone Flush n Fill T or is this the wrong hose?
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Old Jun 25, 2025 | 02:22 PM
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Originally Posted by wchee1
To flush my 2002 LS430 cooling system, I’m using the Prestone Flush n Fill Kit. Is Hose 1 the proper hose to cut and install the T?

Is Arrow 1 a good spot to cut and install the Prestone Flush n Fill T or is this the wrong hose?
I wouldn’t touch either of those unless you have a genuine Toyota/Lexus part to replace them after you’re done.
You won’t find it at any parts store and bulk hose definitely will not suffice.
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Old Jun 25, 2025 | 03:03 PM
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By looking at the kit the tee does have a cap and goes into inlet side of heater core. A long time ago at our dealership we recommended this and ended up replacing radiators and heater cores from being clogged by the backflush. I will never do this to any of my cars as I know what can happen.
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