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If you've 'burped' the system and don't think there's any air in the engine/radiator part of the system, my guess would be your expansion tank isn't big enough to handle the volumetric change in the water at temperature.
As an example, when driving my Alfa back home from pickup in Palm Springs on a 110*F day, the water was pumping out the overflow tank like crazy when we hit the freeway. Stopping at all the exits and finding water to drench the radiator, all while the engine is running, caused the water to be sucked back into the radiator/engine from the tank. It was a good lesson on how not to overheat an engine for my son. There are a lot of off ramps on the I-10 between PS and Riverside. We made it home without blowing up the engine, but my wife about blew a fuse having followed us all the way in her air conditioned van with my daughter.
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Scott
'78 SC mit Sportomatic - Sold
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