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I came to determine that a vibration around 3kRPM was due to the bearings in the water pump going bad, but I started feeling the vibration probably 10k miles before the pump failed. When it went, the sound was nasty, it sounded like a can rattling around in one of my wheel wells.
Not a huge deal, replacing it myself was easy, and I found the part for $107 on eBay. Replaced the belt and changed the oil while I was in there. Total was around $200.
Can't hurt anything but your wallet to change it now.
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2001 Boxster - Grey on Grey
1969 911T Targa - 'Stinky'
http://www.zoto.com/frayadjacent/img...f27a-4a399.jpg <---- my car. ^ crap I post.
"The existence of the flamethrower is evidence that someone, somewhere once said 'I want to set those people over there on fire, but I don't want to have to walk over there to do it.'"
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