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  #1  
Old 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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Old 10-01-2008, 05:55 PM
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You may have a leak somewhere
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Old 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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Old 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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Old 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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Old 10-04-2008, 02:47 PM
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Quote:
Originally Posted by C280 Sport View Post
the txv?
Thermal Expansion Valve
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Last edited by gmercoleza; 10-04-2008 at 05:07 PM.
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  #7  
Old 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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