Switching to Toyota Red coolant from green. Regular or chemical flush?

AaronB

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#1
With a new radiator going in I'm finally going back to the Toyota Red coolant. The car came with green, and I would use the Prestone "safe for all models" green stuff to fill up / top off. I've read about the silicates in the green sticking to gaskets and stuff making the engine a little less happy, so would I be better off doing a chemical flush with 420cf or the like? Or just a regular flush with a few cycles of distilled water to clean all the old stuff out. I know either way is probably fine, but I'm trying to do everything proper.
 

plaaya69

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#2
AutoZone has a few different types of radiator flush chemicals when I was there last time. I personally would run a few cycles with regular tap water some radiator flush in each one and drain it out a few times. Then I would use distilled water mixed with the Toyota red for the grand finale.

Make sure you have you heat on full while you are doing your flush and it is a good time to clean out the coolant reservoir tank also if you have not done so.
 

suprarx7nut

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#3
Agreed with @plaaya69 . Use one of the clean out bottles from Prestone. My approach is generally:

1. Drain all old stuff, including block drain.
2. Fill with water (Demineralized, if possible)
3. Drain.
4. Follow prestone instructions.
5. drain, fill with Toyota Red.
 

AaronB

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#4
Awesome, thanks for the advice guys. Once I get a day off I'll do a few flushes. Working on cleaning out the bottle now.