Whistling Fan

Dec 2, 2015 | 11:22 PM

michaelcrawford

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Joined: Oct 2015

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From: Toronto, Ontario, Canada

2018 C43 AMG

Whistling Fan

Anyone else have an issue when the heat or AC blower fan is above 3 "bars"? It sounds like a whistle. It's quite pronounced only above the 3rd fan setting.

Dec 3, 2015 | 02:41 PM

super7pilot

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Joined: Jun 2014

Posts: 190

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2014 GLK250, 1983 Caterham super 7

I have it a little bit. But it doesn't really bother me enough to have the dash tore apart to fix it.

Dec 4, 2015 | 12:16 AM

MBKLUE

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Quote:

Originally Posted by super7pilot

I have it a little bit. But it doesn't really bother me enough to have the dash tore apart to fix it.

I would think your version (2014) would/might generally be quieter anyway with the round vents. Don't know how the rest of the "plumbing" compares for the early GLK vs. later version.

Dec 4, 2015 | 03:02 AM

super7pilot

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Joined: Jun 2014

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2014 GLK250, 1983 Caterham super 7

Quote:

Originally Posted by MBKLUE

I would think your version (2014) would/might generally be quieter anyway with the round vents. Don't know how the rest of the "plumbing" compares for the early GLK vs. later version.

I suppose it depends on where the whistle is originating. Very well could be some sort of protrusion deep in the bowels of the duct work that is common between both years. Mine only does it when cranked up to Wyoming wind speed levels. I.E. pretty much max fan speed.

No matter, I think that it would be fool hearty and could create more issues, Like a creaky, rattling dash by having it tore apart under warranty.

Dec 4, 2015 | 07:23 AM

eki912

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Joined: Nov 2014

Posts: 83

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GLK 250 Bluetec

Does it happen even if you adjust air to different areas, footwell, wlndscreen, direct to face ?
And are all dash vents fully open ? I remember on one of my previous cars, when one of the dash vents was not fully closed, so left open for few millimeters, it made a high tone whistle on high fan speeds.
Ofcourse, can be something else too, leaves from trees inside the inlet or something like that.

Dec 4, 2015 | 09:48 AM

bop11

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Joined: Aug 2011

Posts: 861

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From: Philly area

350 GLK, C280

Maybe a fan bearing. I haven worked on a GLK fan but if it is similar to a C series, the fan motor and blower can be removed quite easily from under the glove box. You may also want to check the cabin filter for something lose.
There were problems in some C class of the control door actuators breaking, but I think that was redesigned.
If not the motor try eki912's advice to narrow it down to a particular vent. Don't forget the rear ones.

Dec 4, 2015 | 10:38 AM

MBKLUE

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Joined: Mar 2013

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Quote:

Originally Posted by super7pilot

...
No matter, I think that it would be fool hearty and could create more issues, Like a creaky, rattling dash by having it tore apart under warranty.

I was thinking the same thing... a new noise, maybe loosing a mounting screw, breaking a plastic retainer tab etc. Might not be worth it.

As an aside, if there's one thing I've learned about plastic parts with press fit in cars is it's much better to remove and replace them in summer rather than when the pieces are more cold/brittle/stiff during winter, for example.