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Looking for the correct diagnostic sequence. 2000 Boxter S burped coolant and overheated. I refilled the reservoir, replaced the cap with a new one, but did not release the pressure with the bleeder valve. The car overheated and leaked a couple more times. No signs of sludge in oil that I can see on dipstick. Fans seem to be cycling as expected. Reservoir replaced a couple years ago.
Should I properly flush air in the system and retry or should I look for the source of the initial overheat? If looking for the source of overheat, is the next logical step the thermostat?
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