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I've had a couple of near misses in mine with leaks, caught them because the heater stopped working. As it's the highest point you won't notice the lower coolant levels because there will be an air lock that can extend into parts of the head... mine had a bleed point at the firewall where the...

The heater is the highest point in these systems, if you loose heating, its the first sign that you have low coolant and have a leak or something worse. Did you get the air out of the coolant after bypassing erg valve? I believe you need to have the heater on hot while bleeding to achieve this.