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+1 on finding a mechanic that actually knows Porsche Cars and works on them regularly
Do you know what exact water pump he installed? Hopefully it was not some autozone/napa special with a metal impeller. Lots of threads on water pumps. In short, a metal impeller while is sounds like it would be better as it wouldn't break up into little pieces is a problem because if the bearing wears and you get any wobble in the shaft, it will act like a grinder to your engine block. Best bet is a Pierburg WP which makes them for Porsche and is an identical part
Rex is correct on the coolant. If different types of coolant are mixed, it can cause a lot of problems. $35 is really cheap for Porsche coolant, most likely around $40-50 a gal.
If the WP and thermostat were replaced, they should have also flushed and refilled the coolant
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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