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1997-2006 Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator Discussion

hissing noise from rear drivers side when A/C is running

   
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Old 08-20-2012, 09:45 AM
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kalpesh
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hissing noise from rear drivers side when A/C is running
does anyone know what this sound is, how to fix it, pretty anoying, hear a hissing sound, as air is being released, every few mins...
 
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Old 08-20-2012, 01:02 PM
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You are low on freon. The expansion valve on the rear A/C starts making that noise when the system is low.
 
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Old 08-20-2012, 01:10 PM
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Thanks, now i have to check if their is a leak or just low from teh truck sitting.
 
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Old 08-20-2012, 08:37 PM
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There is a leak somewhere. Freon won't disappear from non use.
 
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Old 11-12-2012, 03:51 PM
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i get the same hissing noise when the heat is working and no A/C same issue?
 
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