Volvo S40 The S40 is Volvo's most affordable sedan with all the amenities of a luxury sports car.

USS Control Unit ???

Old Jun 3, 2009 | 05:16 AM
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brooksp's Avatar
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Question USS Control Unit ???

Hi,
I have a 1999 S40 LPT.
There is a clicking noise coming from under the glove compartment.
I think it is coming from a small grey box labelled "USS control Unit".
Can anyone tell me what this unit is ?

Thanks

brooksp
 
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Old Jun 3, 2009 | 06:45 PM
  #2  
tech's Avatar
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Does the clicking stop of you turn recirc on or off?
 
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