[TR] Removing

[Randall]

> 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