AC hissing sound

NJH E320 · 05-05-2012, 04:59 PM

Hey, im new to this forum and looking for some help. When i turn the AC on in my 1999 E320 there is a slight hissing sound while it is blowing. Has anyone else had this problem? Thanks.

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illest · 05-05-2012, 10:36 PM

this generally means you are low on r-134 but before you do anything run the onboard diagnostics http://www.eclassbenz.com/2010/02/ho...-malfunctions/

MASTERBENZ · 05-05-2012, 10:58 PM

Time to recharge your A/C and inject dye to inspect for future leaks!

NJH E320 · 05-05-2012, 11:53 PM

Quote:

Originally Posted by illest

run the onboard diagnostic

1-76
2-71
3-75
4-76
5-39
6-157
7-09
8-98
error codes:
eb1234
eb1235
eff
e

Plutoe · 05-07-2012, 08:17 AM

The two faults 1234 and 1235 are sun sensor and emissions sensor. The sun sensor impacts the start up fan speed and the emissions sensor impacts the vent closings. On a scale of 1 to 10----these are about 3------the data does suggest( #7,#5) that you are low on refrigerant and therefore the suggestion to get a leak test prior to a refill sounds sensible. Good Luck

05-05-2012, 10:36 PM	#2
illest Senior Member 1998 Mercedes-Benz E-Class Join Date: Aug 2006 Location: dc Posts: 409 Drives: 4 matic	this generally means you are low on r-134 but before you do anything run the onboard diagnostics http://www.eclassbenz.com/2010/02/ho...-malfunctions/ __________________ oo=[][]=oo Oo\=*=/oO Stuff for Sale

05-05-2012, 10:58 PM	#3
MASTERBENZ Junior Member Garage is empty, add now Join Date: Mar 2008 Location: Alexandria, VA Posts: 42 Drives: Mercedes-Benzes: 2005 ML500, 2002 E320 4-Matic, 1993 300E, 1994 E320, AND 1999 C230 KOMPRESSOR	Time to recharge your A/C and inject dye to inspect for future leaks! __________________ I'M A FACTORY-TRAINED MERCEDES-BENZ MASTER SYSTEMS TECHNICIAN, ASE (AUTOMOTIVE SERVICE OF EXCELLENCE) MASTER AUTOMOBILE TECHNICIAN, BOSCH MASTER TECHNICIAN, MECP (MOBILE ELECTRONICS CERTIFIED PROFESSIONALS) MASTER TECHNICIAN, AND A L1 ASE & BOSCH ADVANCED ENGINE PERFORMANCE SPECIALIST WITH A MASTER'S IN BUSINESS ADMINISTRATION.

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05-07-2012, 08:17 AM	#5
Plutoe MBWorld Fanatic! Garage is empty, add now Join Date: Feb 2011 Posts: 1,229 Drives: 1999 E300TD	The two faults 1234 and 1235 are sun sensor and emissions sensor. The sun sensor impacts the start up fan speed and the emissions sensor impacts the vent closings. On a scale of 1 to 10----these are about 3------the data does suggest( #7,#5) that you are low on refrigerant and therefore the suggestion to get a leak test prior to a refill sounds sensible. Good Luck

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