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#1
08-17-2006, 08:37 AM
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Air con makes strange hissing noises
1999 SL500, 118k miles.
The air conditioner in my car intermittently makes a hissing noise for about 3 seconds every 30 seconds or so. It sounds like it is exhaling or breathing out. The sound comes from the centre vent nozzles. It does not happen when the "EC" button is pressed (i.e. the air conditioner is disengaged). I am not sure how well the air conditioning function is working (it's not very hot around here at the moment); it seems to be OK but not particularly brilliant. Any ideas?
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JJ Rodger 2013 G350 Bluetec 1999 SL 500 1993 E300 diesel T 1990 190 
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