That is a very common sign of a BHG. Get a leakage tester and pressurize each cylinder on tdc compression with the radiator cap off, if the coolant level changes at all or bubbles when you pressurize any cylinder, you can be sure it is a bhg or cracked head/block, but more likely head gasket. After a drive, is the upper radiator hose full of air as well? Good sign of a bhg.
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