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Similar issue with 98 Boxster for the past year. Pre-Covid - I noticed coolant coming from overflow.
Took it to indy mechanic
Replaced the cap with OEM cap - Performed pressure test, burped valve, etc...and everything passed with flying colors. Kept it their overnight - mechanic drove it around the next day, performed the same tests with same results.
Occasionally small amounts of coolant started coming out of overflow again - Indy mechanic doesn't want to charge me the labor to investigate more or replace the coolant reservoir. I have to respect that.
I top it off at least once a month.
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