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940 recirculation button 900 1991

Hi all,

My 940 has a little button on the dash which is pressed in to switch to full
recirculation and and pressed again to have fresh air coming in through the
vents. Does anyone else who owns a 940 on this list notice that when you
switch to fresh air (button out) there is a noticeable hiss?
My car has been doing this for ages and I was wondering if it is normal.
The hiss is definitely coming from around the back of the control unit in
the dash.

Any thoughts?

Thanks
Brad
91 940GL






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