when i was having this problem I found a DIY on the internet to make a "jumper". I removed the 4 relay's in the fuse box for the coolant fans and using the "jumper" I determined my right fan wasnt working at all, binding and causing frying in the fuse box for the row of fuses for the fans are. My left fan was only working on High indicating the resister was shot. I chose to replace both fans, and cleaned the radiators.
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99 Porsche Boxster
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