The burping is only a suggestion - the airlift is pretty reliable, but......
Just a thought - is your car a tip ?? I think tips have a slightly different way of flushing the cooling system - use the search function as I'm not sure of the specifics, pulling fuses or something.
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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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