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This sounds like a classic air in the cooling system problem.
When you "burped" the system, did you do the following:
1) Lift the D shaped expansion valve lift ring to its vertical position (open).
2) Make sure the coolant level is on or just below the max when engine is cold.
3) Leave the expansion valve D ring open for at least 2-3 complete heat cycles - stone cold to hot with the t'stat fully open (at least a 10 mile drive).
If you did the above, there is another problem with either the valve or the expansion tank cap.
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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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