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Re: Wierd coolant temp behavior (2)

Mike.......Just did some more thinking about your 'boiling' radiator (the
one with too much pressure in the coolant system to be explained by the

What we are dealing with here is a radiator that is building up _gas_
pressure at temperatures where antifreeze solutions shouldn't boil.

I tried explaining that by postulating you were operating at very high
altitude with a faulty pressure cap. Or you didn't really have an
antifreeze solution, etc.

What else could account for gas pressure in the cooling system, if it isn't
really boiling of the solution?

Answer: Leaking head gasket.

Think about it. And test for combustion gases in the coolant.

Doyt Echelberger

At 10:08 PM 6/12/1999 -0700, you wrote:
>hey all, i have a question... i have an MC in my UrQ, .........snip..........
>the question i have is that the guage, on the freeway, no fan on only 
>reads what i  believe is 150 degrees F.  It has boiled over before, and i 
>also got a brand new radiator cap.  The confusing part is that it boiled 
>over at just about 200-210 degrees when i let it idle one time without 
>turning on the fan...  I would imagine that it shouldnt really be boiling 
>over at this temp...shouldnt the pressure in the system be low enough to 
>not cause the cap to release pressure, but high enough to inhibit the 
>boiling itself?  if so, 

what could be causing too much pressure in the 
>coolant system?  
>thanks all...
>Michael Sheridan Williams
>San Francisco, CA
>ICQ# 11740998
>1983 UrQuattro, MC--1.8 BAR, borla, 16x7.5 OZ Mito's w/ SP8000's, K&N
>1985 4000S Quattro, Koni Yellows/Coilover (2B), strut brace, Sport 8000 
>Tires, K&N