I always tee in a pressure bottle to the lines and pump to 15 or so psi. see if it holds. All these stupid leaks are easy to find with engine at ambient, in the quiet garage with engine off. I dont know how many leaks Ive found this way. Glad it wasnt more serious, and I'll check my coolant bottle, that thing is a relic.

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Paul
Benz-less
I need an SDL !