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#1
10-01-2008, 04:11 PM
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Hissing sound from the A/C
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
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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 
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#2
10-01-2008, 05:55 PM
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You may have a leak somewhere
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1986 300SDL, 211K,Dealership serviced its whole life 1991 190E 2.6(120k) 1983 300D(300k) 1977 300D(211k)
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#3
10-01-2008, 06:53 PM
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The TXV will often hiss if the charge is somewhat low, however this is not a constant hiss; it is cyclical.
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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#4
10-04-2008, 11:42 AM
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the txv?
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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
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#5
10-04-2008, 02:29 PM
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Pull your AC actual values (1-8) and error codes and post them.
http://www.continentalimports.com/ser_ic40142.html
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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#6
10-04-2008, 02:47 PM
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Quote:
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280 Last edited by gmercoleza; 10-04-2008 at 05:07 PM.
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#7
10-04-2008, 03:05 PM
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It is most likely low refrigerant level, but a restriction in the system can cause the same thing, which is insufficient refrigerant flow at the TXV.
The best way to tell which is the case is to evacuate the system and recharge by weight. If the pressures are then within specs, you're good to go. If not, you're not.
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