Open the pressure vent valve for a few heat cycles - I'll bet you see the coolant level drop if air is in the system.
The valve's D ring needs to be flipped up & is located under the plastic cover between the coolant fill and oil fill caps in the rear boot (trunk).
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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