Re: [Chrysler300] Overheating revisited

[Ray Jones <hurst300@xxxxxxxxxx>]

Anti-freeze is also a coolant. But what really prevents the water from boiling is the Pressure Cap.
All modern engines run at about 240 degrees as a normal temp. The pressure is what keeps it from boiling.
Don't worry so much about your fan, it's the loss of pressure that allows it to boil.
That's why you can't take a cap off a hot engine, it will instantly boil and actually turn to steam. Bad news for the cap remover!

Widely different temps, and many other variables are engineered into modern engines and metals and scratching our heads over them just wastes time, they work incredibly well.
Ray



On Jun 10, 2010, at 9:33 PM, mckanical-marvels@xxxxxxxxxxxxxx wrote:

My wife had a Pontiac once, with an aluminum head, 
that had a 240 degree thermostat! You might say, "Wait a minute. Water boils 
at 212 degrees". But, we don't use water. Antifreeze is also called 
"antiboil". I had to ask this question: If I am running at 240 degrees, and 
the electric cooling fan fails, how many SECONDS do I have until that engine 
is ruined?



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