Reply to "Cooling system over pressurized"

larrywMember

The classic reason is a failing head gasket. The pressure should be lifting the seat in the swirl tank cap and venting to the overflow tank though. What temperatures are you seeing? Maybe you have a bad cap, otherwise you may just have leaks.
Perhaps you can borrow a system pressure checker from a friend or fit a pressure gauge to an unused port in the cooling circuit to verify your concerns?
A cylinder compression check might be worthwhile too.

8/16/154:16 AM

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