In a message dated 7/10/2006 12:03:46 PM Central Standard Time,
tr3driver@comcast.net writes:
> That is considerably more dangerous, since that 'singing' is steam escaping
> through the radiator cap. Steam of course means there is not liquid coolant
> in
> some parts of the engine, and steam is a lousy coolant (compared to water),
> so
> that probably indicates localized overheating far in excess of what your
> temperature gauge says. This can possibly lead to a cracked head.
>
And it is quite possible that as long as the water was circulating there were
no localized hot spots and only when the circulation stopped did you get
localized boiling. So you didn't hear all the singing while it was running
because it wasn't.
Dave
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