Retro...
Even if its a suspect cap, there is a good chance that air has got into the system which means you will have to lift the D ring on the relief valve for a couple of heat cycles & top up the coolant accordingly.
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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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