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RE: cooling fan problem? [saabnow]
Posted by The Saab Network (more from The Saab Network) on Fri, 7 Mar 2003 17:48:33
In Reply to: cooling fan problem? [saabnow], The Saab Network, Fri, 7 Mar 2003 15:18:27 
Message from Jack Brooks - http://saabnet.com/tsn/forms/e.php3?em=60

Subject: RE: cooling fan problem?
=================
Most cars need some back pressure to keep the block pressure above ambient
system pressure.  It prevents localized boiling by keeping the pressure higher
within the block.  This is why many racers, who need all the cooling they can
get, use restrictor plates.  It has nothing to do with water moving too fast the
radiator - that is a myth.

Put your thermostat is a pot of water and boil it.  It should open right before
the water goes to full boil.  If it is bad, get the proper thermostat from a
dealer or aftermarket and replace it.

Since your problem is with idle, not hwy running, I'd suspect that fan, not the
thermostat, but I am not familiar with the two fan system.

Jack Brooks
Covington, WA
1988 Saab 9000S
2002 Subie Legacy GT
1960 Triumph TR3A
1980 Triumph TR8

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