I replaced mine about a month ago at 84,000 miles. I did not replace the thermostat. I've seen a range of mileage for failures, and you are in the range. Mine just started making a grinding noise when I stopped the car at the end of my driveway to pick up the mail. It could have been much less convenient. I think you are smart to do it now. Consider using an Airlift tool to fill the system if you DIY. See this video: Uview Airlift Kit 550000 Demonstration, Pressure Test, Coolant Fill - YouTube
Now that I've done one, I could do it again in about 3 hours.
I ordered a water pump, gasket and 3 gallons of coolant from Sunset Porsche. The cost breakdown was:
Water pump: $268
Gasket: $7.71
Coolant: 3@$27.93 - $83.79
Shipping: $46.24
Total: $406.45
There are good DIY instructions on Pelican and Pedro's Board. Pedro recommends loosening the front engine mount to access some of the bolts. I did not find that necessary.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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