This would be better asked in the water cooled tech forum, most of us here have no experience with the stuff your car has.
Porsche 996/997/991 Forum - Pelican Parts Technical BBS
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2018 718 Cayman 2.0
Priors - '72 911T coupe, '84 911 Carrera coupe, '84 944, '73 914 2.0
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