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Old 02-02-2011, 09:22 PM
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vstech vstech is offline
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
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if solid coolant is heated, then it will expand and build pressure. it should build up to 22Psi (if you have a 140kp cap) when at operating temperature.
if at full operating temp, the upper hose is not pressureized, then there is a leak somewhere in the cooling system. weather or not it causes a problem is unknown. I like things to operate as designed. I do know that in the summer time, the pressure keeps the coolant from boiling by raising the boiling point of the coolant.
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