My 2000 S80 is well past 105K. I havent disassembled yet, but should I plan to replace the water pump preventively, even if it looks good? What about thermostat? I plan to replace the tensioner and idler. I see parts listed for the tensioner and tensioner pulley- do I replace both? Thanks, jwr

 

You can do the water pump if you want.

The tensioner should be the manual on your car.It should be part# 30638277 I believe. Sorry I forget the idler one though. But the idler is only a pulley no brackets or anything.