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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 July 27th, 2020, 14:23   #1
rmilchman
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Join Date: Jun 2014
Location: Robbinsville, NJ
Default Fan noise

I think my auxiliary fan is going bad, but looking for confirmation or another suggestion. When the fans are running I can feel a vibration through the car. When running at full speed and the flaps also open there is a lot of vibration and the noise generated is louder then the engine itself. Here's a video when they are running at full speed.

https://youtu.be/16XzUYeiGzA

If they are running at full speed and I shut off the car, they immediate slow and the noise is softer.
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Old July 27th, 2020, 15:07   #2
joshferrer
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Location: Ontario, CA
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Quote:
Originally Posted by rmilchman View Post
I think my auxiliary fan is going bad, but looking for confirmation or another suggestion. When the fans are running I can feel a vibration through the car. When running at full speed and the flaps also open there is a lot of vibration and the noise generated is louder then the engine itself. Here's a video when they are running at full speed.

https://youtu.be/16XzUYeiGzA

If they are running at full speed and I shut off the car, they immediate slow and the noise is softer.

Have you checked the ac lines right next to the frame? I had an issue like this where I thought it was a fan. I was able to track it down to one of the lines that was just close enough to rattle against the frame like crazy making that sound. I moved it just a little further out and no issues after that.

I also did end up replacing a fan after that line fix but that was more because that specific fan was crooked making it wobble when spinning and creating more vibration than I wanted. It wasn’t noisy like this though. That helped that issue too.


-2014 Passat TDI SEL
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Old July 27th, 2020, 15:50   #3
rmilchman
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I'll take a look at the lines.

Thanks
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Old July 27th, 2020, 16:58   #4
rmilchman
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Do you recall where the AC line was? On the top frame in the area of the fuel filter or on the bottom somewhere? I went out and tried to move some of the lines up top and make sure the rubber fittings where in contact with the frame. Then took it for a ride, I guess I didn't get it hot enough for the fans to kick in full speed. I'll try a longer drive tomorrow after work.
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Old July 31st, 2020, 10:56   #5
rmilchman
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Couldn/t find any AC lines rattling. I tried using a screwdriver and touching different lines while I heard the rattling. Cooling line on left side of radiator barely vibrated, cooling line on right side the screw drive would jump around.

Any suggestions?
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