> I don't think the sediment is all from the coolant. Some
> sediment is certainly rust, and maybe other oxidised
> material. Some may be from rad sealants previously used. Some
> may be from minerals in tap water when distilled water has
> not been mixed with the coolant for the fill.
Plus of course the casting sand you mentioned before.
My non-LBC grocery-getter was actually clogged up from "strings" of the
silicone RTV sealer that a previous mechanic had used on the water pump.
Randall
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