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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW Passat Family (NMS and B7) TDIs (2012+)

VW Passat Family (NMS and B7) TDIs (2012+) Discussion area for the 2012+ Passat TDI (North American and rest of world versions versions). The North American model was previously codenamed NMS (New Midsize Sedan) and the version the rest of the world gets is sometimes referred to as B7.

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Old June 21st, 2018, 13:29   #1
reilljp
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Join Date: Mar 2016
Location: San Carlos, CA
TDI(s): 2015 Passat
Default Cabin Heater Noise

When the cabin heat is turned on, I hear a humming sound that comes and goes. It is not loud but has become quite noticeable to me.

If the dial is at full cold, there is no noise. If any heat is added, after about 10 minutes the intermittent humming starts. It will hum for 10 seconds or so, stop for the same, and start again. The duration is not predictable, it just comes and goes.

The noise appears to come from under the steering wheel near the door, but that could just be where the noise is being reflected.

Any ideas what this could be?



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Old June 22nd, 2018, 06:41   #2
740GLE
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its summer, why you running heat?

You got AC on? You maybe hearing the compressor duty cycle when it's not trying to run full cold?
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His: 2017 Alltrack SE, waiting for TSI to TDI conversion kits to be released.
Bought back 2010 Sedan, cog swapper, build date 07/09, BB 6/7/16. 2012 Passat, Roof+Nav, build date 05/12, BB 7/11
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Old June 22nd, 2018, 16:49   #3
reilljp
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TDI(s): 2015 Passat
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Not full heat, just a little heat in the morning.

I donít hear the AC when the temp is set to cold. I always run the AC, regardless of the temp setting.

The noise is coming from inside the car.


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Old June 25th, 2018, 06:09   #4
740GLE
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Right so if it was full cold, the ac will be at max duty cycle, but if you "add heat" that duty cycle is now what 50% or something? Shut the ac off and try "adding heat" see if it is the same.

Other than that, not sure.
__________________
Hers: 2015 Passat SEL (NOS) w/ VW fix and Malone Stage 2.
His: 2017 Alltrack SE, waiting for TSI to TDI conversion kits to be released.
Bought back 2010 Sedan, cog swapper, build date 07/09, BB 6/7/16. 2012 Passat, Roof+Nav, build date 05/12, BB 7/11
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Old June 29th, 2018, 17:27   #5
reilljp
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Join Date: Mar 2016
Location: San Carlos, CA
TDI(s): 2015 Passat
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You are right, I turned off the AC and the noise stopped. There must be something wrong with the AC then. Why else would I hear a humming sound coming from inside the car? Itís not a AC type sound.


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Old July 2nd, 2018, 05:55   #6
740GLE
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Progress!!! Maybe a sympathetic vibration?

Pop the hood see if you can pin point the sound with your ears.
__________________
Hers: 2015 Passat SEL (NOS) w/ VW fix and Malone Stage 2.
His: 2017 Alltrack SE, waiting for TSI to TDI conversion kits to be released.
Bought back 2010 Sedan, cog swapper, build date 07/09, BB 6/7/16. 2012 Passat, Roof+Nav, build date 05/12, BB 7/11
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Old October 31st, 2018, 15:41   #7
reilljp
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Location: San Carlos, CA
TDI(s): 2015 Passat
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Update: Dealer replaced the a/c compressor and the noise is gone.


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