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Discussion Starter · #1 ·
Hi! Our 2000 S40 with 85k miles has recently developed a short squeal at start, sounds like this (two short MP3 sound files):

S40 Engine Start Noise 1

S40 Engine Start Noise 2

Facing the open hood it sounds like it comes from the right. We get the squeal both with the A/C turned on and off. Could it still be the A/C compressor? Any other advice? Otherwise, the car performs fine.

Thanks and regards,
Stephen in Myrtle Beach SC

P.S. What is the black wire sensor under the middle of the rear seat? A black wire leading from the dashboard is taped down about 3 inches right of center under the rear bench with a plastic cap. What is it?
 
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