The 986 (Boxster) and the 996 (911) represented a shift to water cooling for Porsche (though they were by no means the first water cooled Porsches).
Links to Parts for the Cooling System
These are the parts I used for my 2000 Boxster S. While these are often shared across the 986 and 996, you should always check to make sure they fit your car.
- The Water Pump is part # 99610601156. I recommend Pierburg (the original supplier) with a plastic or "composite" impeller. Here's an example at Pelican Parts.
- The Water Pump does not come with a gasket, so you must also order one. Part # 99610634054 The original gasket was manufactured by Elring Klinger and was metal.
- Thermostats come in many flavors. I used the original 83 degree stat manufactured by Wahler. This particular one (the one I used) comes with the housing and gasket. If you buy only the thermostat, you will have to buy the gasket and removal tool to reuse the old housing. Part # 99610601359
Links to Special Tools
- The Vacuum Filler tool I used from Amazon.
- Hose removal tool. I had one on hand, but these new ones are superior.
Porsche Coolant Capacities
Sources: 2000 Boxster S owner's manual and the expensive but recommended Bentley Service Manual
I can't guarentee the above chart is accurate. If you have a better source (a Porsche owner's manual) for these or other models leave a comment and I will update the chart for other Porsche owners.