Or there again, how much did the coolant drop after the belch?
Sounds to me that you had an airlock but it then cleared itself with the “burp” and then it was fine afterwards. If an airlock then I would have expected the coolant level to go down in the expansion tank after first overflowing, OK you lost some through the cap, but level of drop in the expansion tank suggest to me an airlock.
Mine overheated and vented coolant when I first bought it despite a working fan and minus 12 outside, caused by an airlock, but at a much higher temperature. Didn’t notice any power loss but then again I struggled to get home on barely tickover as the temperature shot up as soon as I pressed the engine. The car had rejected all “professional” attempts to bleed it. It's been fine ever since I bled it and my normal temp is around 95 / 96.
If the machine is happy now I’d continue to use it, monitoring the IPK temperature as you are doing and checking the coolant. Refilling the coolant again and risking another airlock seems asking for trouble.
Regards
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