My first thought was that perhaps someone reused the original spring clamp, they were not made to be reused. It's a great idea to do a preventative water pump replacement, change the seal, and do a coolant flush. You might think about a low temp thermostat since you will have all of the coolant out, and the motor mount. It's a lot easier to change the motor mount with the WP out, and they only last about 100k. Also, inspect the hoses for any excessive stiffness or cracking.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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