Not funny. 
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2012 GLK 350
No actually I had the same sound on two different 2012 GLK350's so figured it was normal with A/C. Maybe I'll mention it today, I'm going for my pano sunroof problem. Will let you know what they say.
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2012 GLK350 Artic White/Premium Package/MultiMedia Package/AMG Styling Package
Haven't seen the auto dirty; the wife is spectacular under any condition.
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Nissan GT-R BE / '12 Ducati-1199 Panigale S / '12 C300-4M Loaded/GLK350-4M Loaded
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From: Northern New Jersey
2010 GLK Black, Premium 1, Lighting, Multimedia, Appearance and Media Pkg, 2012 Corvette Grand Sport
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From: East Texas
2004 Volvo XC70; 2012 GLK 350 4matic
Wayne
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2012 GLK 350
I made an effort to listen to the A/C with/without recirc. on yesterday & this morning. Audio off. Sitting at lights. Engine idling. In AUTO mode I could barely hear the fan. I could tell it was on. Very quiet. Pressing the recirc. button the fan sound went up a decible or so. Still quiet, but not as quiet as the recirc. switch off. When I switched the recirc. off, I could hear the flapper moving to it's open position. When the car was moving or with the radio on, you can't hear the A/C system no matter how the switches are set. In a word: quiet.
Wayne
Wayne
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Junior Member
Joined: Dec 2011
Posts: 47
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2012 GLK 350
I made an effort to listen to the A/C with/without recirc. on yesterday & this morning. Audio off. Sitting at lights. Engine idling. In AUTO mode I could barely hear the fan. I could tell it was on. Very quiet. Pressing the recirc. button the fan sound went up a decible or so. Still quiet, but not as quiet as the recirc. switch off. When I switched the recirc. off, I could hear the flapper moving to it's open position. When the car was moving or with the radio on, you can't hear the A/C system no matter how the switches are set. In a word: quiet.
Wayne
Wayne
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From: East Texas
2004 Volvo XC70; 2012 GLK 350 4matic
Interesting. I'll try that. However, since 1999 & 3 vehicles, the climate control system has been set to AUTO. Works for us. On the Gulf Coast. First New Orleans & now Houston & East Texas. Perhaps that explains the quiet.
Wayne
Wayne
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From: East Texas
2004 Volvo XC70; 2012 GLK 350 4matic
UPDATE: Checked the oil & finished recording a CD at lunch. Checked A/C & Recirc. Manual mode. All fan speeds. No whistle. Just fan sound. Even tried MAX cold for the first time. Just fan sound. Reset to AUTO where it will stay.
Wayne
Wayne
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GLK
Same Problem on my GLK 2012 only 190miles
UPDATED - head tech found the problem. The seal in the heater box needed to be replaced. So they put a new seal in the heater box (I guess heats the air that comes into the heating system???) and noise is gone so if anyone else is having this wind noise problem, ask the dealership to check on this seal. Part had to be ordered and car should be good tomorrow.
Information from service report:
CONFIRM CUST COMPLAINT, FOUND WHISTLING NOISE FROM CAR AT HIGHWAY
SPEEDS, PERFORM EXTENSIVE TEST DRIVE, APPLIED TAPE TO ELIMINATE NOISE
FROM WINDOWS OR SUNROOF, R/R WIPER COWLING, FOUND NOISE WOULD GO AWAY
WHEN TAPE WAS APPLIED OVER AIR INTAKE FOR OUTSIDE ON HEATER BOX, R/R
GLOVE BOX, FOUND NOISE COMING FROM SEAM ON HEATER BOX, SEAM WAS
CAUSING WHISTLING NOISE WHEN OUTSIDE AIR WOULD ENTER BOX AT HIGHWAY
SPEEDS, DRAIN COOLANT, EVAC AR/C SYSTEM, R/R DASH AND DASH SUPPORT,
R/R AND A/C HEATER BOX, USED BUTTLECORD TO SEAL A/C BOX, REINSTALL A/C
BOX, RECHARGE A/C SYSTEM, CORRECT COOLANT LEVEL, RETEST DROVE AFTER
REPAIR, FOUND WHISTLE WAS ELIMINATED, CLEAR CODES, ALL O.K NOW.
Information from service report:
CONFIRM CUST COMPLAINT, FOUND WHISTLING NOISE FROM CAR AT HIGHWAY
SPEEDS, PERFORM EXTENSIVE TEST DRIVE, APPLIED TAPE TO ELIMINATE NOISE
FROM WINDOWS OR SUNROOF, R/R WIPER COWLING, FOUND NOISE WOULD GO AWAY
WHEN TAPE WAS APPLIED OVER AIR INTAKE FOR OUTSIDE ON HEATER BOX, R/R
GLOVE BOX, FOUND NOISE COMING FROM SEAM ON HEATER BOX, SEAM WAS
CAUSING WHISTLING NOISE WHEN OUTSIDE AIR WOULD ENTER BOX AT HIGHWAY
SPEEDS, DRAIN COOLANT, EVAC AR/C SYSTEM, R/R DASH AND DASH SUPPORT,
R/R AND A/C HEATER BOX, USED BUTTLECORD TO SEAL A/C BOX, REINSTALL A/C
BOX, RECHARGE A/C SYSTEM, CORRECT COOLANT LEVEL, RETEST DROVE AFTER
REPAIR, FOUND WHISTLE WAS ELIMINATED, CLEAR CODES, ALL O.K NOW.
