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Re: [TR] Radiator Cap Pressure Rating

To: <triumphs@autox.team.net>
Subject: Re: [TR] Radiator Cap Pressure Rating
From: "Randall" <tr3driver@ca.rr.com>
Date: Tue, 14 Aug 2007 13:21:16 -0700
> I like the puking analogy.....and that would explain why the 
> electric fan
> might turn on after you've shut the engine off.  

They happen for the same reason : when you shut the engine off, the insides
of the cylinders are still hot.  That heat moves into the coolant in the
engine block and cylinder head; but the coolant is no longer moving to carry
the heat away to the radiator.  If the coolant inside the engine gets hot
enough, it boils a little and forces coolant out the overflow.  The boiling
absorbs heat though, so it cools the engine and stops the boiling.

A higher pressure cap means the coolant can absorb more heat before it
boils.

Randall 
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