Compression Ignition Addict
Join Date: May 2016
Location: Right where I need to be
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It could also just be a small leak that only shows up under normal pressure caused by thermal expansion (so, when it's warmed up and you're driving it). If you have a bypass filter with valves, take one loose from the filter head and use it to pressure up the cooling system until the cap relieves, then close the valve to leave it under pressure. Get out your flashlight and look everywhere on/around the engine, and lay underneath it. It may take a few moments to show up.
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