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I personally would not want my coolant level to be at high mark when cold.
Your quote "...The coolant tank is filled to the “max” level when cold...... perhaps it’s just overfilled?..."
I like to keep my level between the marks cold.
So overfill definitely a concern/contributor
Also any air trapped could cause issues.
Have you made sure there are no WP, hose leaks, evidence of seeping?
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2002 S - old school third pedal
Seal Grey
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