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Ventilation fan vibration

IanPorley

IanPorley

New member
Hi all, on a recent run out I was pulling into a parking space when I suddenly heard a fast 'ticking' noise. Thinking it may have been a cooling fan with a leaf or twig stuck in it I got out to have a look. It wasn't external however and I located the noise to be under the passenger side of the dashboard...
Since then the ticking has developed into a stubborn noise similar to having something like a bit of paper or maybe an errant sticker catching the fan and it sounds like a a Spitfire taking off on anything but low speed.
I've tried finding the issue with an endoscope, but the one I borrowed was fairly poor quality and to be honest I didn't really know where to look. I REALLY don't want to have to get the dashboard removed to resolve it. Any Ideas? It's a 2010 987.

Cheers.
 
Just guessing here....

It might be worth checking the condition of the pollen filter just to be sure it’s not damaged and letting debris through to the fan.

My daughter once had a Vauxhall Corsa on which the fan was noisy, the carpet was also wet - it turned out that the air conditioning condensate drain was blocked causing the condensate to build up inside the fan casing until it overflowed onto the floor, the noise was the fan blades going through the condensate! There was another Cayman owner here who recently reported wet carpets due to a blocked condensate drain. With this long spell of hot weather the air-con systems will have been working very hard.

 
Hi Ian,

From what you say, it seems that you're sure the noise is definitely coming from the ventilation fan and not a coolant fan, i.e. the noise disappears when you turn-off the fan?

The problem is that sound can travel along the ducting, making it difficult to pinpoint the source. For starters, you should be able to access the fan by removing cabin air filter and reaching in to check that nothing's fouling the fan and that it's free-running. If there's something caught in the ducting probably it would require removal of the IP to gain access, though I'm not sure about that.

Jeff

 
My guess would be the same as AndrewT. Take out the pollen filter, and look or feel inside for debris. It is quite common to get a twig or leaf stuck in the fan there.

 
Thanks, I don't have wet carpets thankfully, but I'll pull the filter (just underneath the bonnet/windscreen on the nearside?) and have a root around. Out of curiosity, where is the condensate drain? :)

 
From what you say, it seems that you're sure the noise is definitely coming from the ventilation fan and not a coolant fan, i.e. the noise disappears when you turn-off the fan?

The problem is that sound can travel along the ducting, making it difficult to pinpoint the source. For starters, you should be able to access the fan by removing cabin air filter and reaching in to check that nothing's fouling the fan and that it's free-running. If there's something caught in the ducting probably it would require removal of the IP to gain access, though I'm not sure about that.

Jeff

Thanks, yes it's definitely the ventilation fan given the noise comes and goes with the fan speed. I'll remove the filter and have a dig to see if I can feel anything :)

 
I had the exact same issue. In my case, it was the foam surround that had worked loose and was flapping about. Take off the air filter and have a look around. I blasted it from above with a Metro Vac, but a hairdryer would do the same thing.

Cheers,

Bryan

 
View of the other side. Good news is, the fan is back to normal and I'm not looking for any more WWII fighter planes flying over head every time it's blowing delicious cool air at me. :)

Any ideas what it is?

 
Ian,

It looks suspiciously like a piece of ripped acoustic trim, but where it's from is anyone's guess - higher up in the cavity maybe? It's probably dropped down from above and got caught-up in the fan.

Anyway, the main thing is that you've located the source of your problem and fixed it. Result.!

Jeff

 
Hi. thanks for this post and also the pictures showing the solution. Would you believe I had exactly the same problem even down to the strange bit of black plastic sheet caught in the fan! Like you I thought I was in for severe financial pain but it cost just £14.95 for a new filter. In addition to the help here I also found this excellent Youtube clip showing how to remove the pollen filter and clear drain holes https://youtu.be/Qb9gG3gBZgM

Thanks again for the post.

Regards

Duncan

 
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