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Old 10-17-2006, 05:34 AM   #3
RandallNeighbour
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Join Date: Jul 2004
Location: Houston, Texas
Posts: 7,243
The driver's side fan is the main one, and it will be the first fan to go out... mine did. The passenger side fan comes on when the AC or a heavy load puts the engine into a hotter situation than normal.

The bearings simply wear out after time on these fans. Cleaining it is a good first move, but if your boxster is older (97-99) you may need to replace that fan.
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