That's what I figured. Should I just flush with distilled, or do I need anything else? Some folks seem to be using various grease cutters, detergents, and other stuff on their rads.
there are 2 ways to clean out a radiator.
Typically if its new...
You can just flush the thing with warm/hot water.
You dont need distilled for the initial flush. Honestly just use Tap water.
Let it sit for a minute and give it a good shake / empty.
It does not need to be boiling, nor do i suggest it to be near that temp.
Hot, to the point where its uncomfortable to touch, but not to the point where u will get 3rd degree burns from, so like a hot spring / hot bath temp.
Fill... shake.... empty... fill shake empty...
Refill it again, and repeat.
Do this until you see nothing coming out... or the water does not appear whitish and comes out clear.
(caution, your radiator will get hot in this process)
After the last flush, you can then do a final flush with distilled to get rid of the tap water.
That should be enough to get the left over resin inside the tubes to dislodge and come out.
If its a used radiator, i typically use a radiator flush.
But this is only if the radiator was used for a while...
It will dislodge scaling + premix deposits, but it requires a lot of post flushes with clean water afterwards as you dont want it left in your radiator.
Hence u will only need to go route 2 when you either buy a used radiator or its been in use for a while.
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