2002 E320. A fantastic car. I just started to notice a hissing/scratching sound comming from the A/C vents when its on, The AC blows cold but the hissing/scatching sound is there. I took it to the shop and looked at it for no charge and said "I might have froze something in the unit" Others say that I am low on R13A

__________________
2015 ML350 4Matic. Wifes DD
2015 GLK350 4Matic. My winter DD
2012 E350 4Matic. Road Trip car
2009 CLK350 Coupe Designo.Kleemann Tune For nice days/DD
2006 CL600. V12.Eurocharged Tune. Enough said
2005 CLK55 AMG Coupe.Kleemann Tune. For the sound and style
2004 CLK320 Cabriolet. 2005+ Interior swap. For the sunny Florida days & beach days