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Old 05-26-2015, 02:26 PM   #12
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,273
Quote:
Originally Posted by Steve Tinker View Post
If you have excess pressure in the cooling system then the pressure must be coming from somewhere.
1)It can't be the pump as I doubt it could compress up to ~ 20psi even with near boiling point water.
2) It could be a blocked engine / radiator vent line (#11 & 12 in diagram) but ??

I'd hate to think that you have a cylinder head crack opening up when hot and combustion gasses are "pumping up" the cooling system....
This is exactly what I posted to the OP on another site (http://www.renntech.org/forums/topic/48478-too-much-pressure-in-coolant-tank/), and suggested running both a leak down on the engine and checking the vapor above the coolant in the tank for combustion gases using one of these:



That excess pressure is coming from somewhere other than the cooling system.....
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Last edited by JFP in PA; 05-26-2015 at 02:29 PM.
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