Hi. I bought a 2013 Octavia RS a couple of weeks ago and now with the recent heat spikes it has developed rather annoying AC noise when starting the journey with a hot cabin (car parked in the sun).

 

I tried searching the forums for similar occurances of AC noise, found some examples but I think they were describing different kind of noise.

The noise I'm describing is modulated by the movement of the car instead of engine rpm: for example if i drive to a bumb on the road the noise may disappear for a second and same with hard deceleration. 

Noise is somehow related to the fan speed: Increasing it manually makes the noise louder. The AC blows cold while the noise is active but I noticed that the air moving out of the vents is decreased. When driving on bumps the amount of air increases if the noise is paused.

The noise is coming from the right side of the dash and if I turn the passenger side AC to higher temperature (effectively turning cooling off) the noise disappears.

After the cabin has cooled down the noise disappears completely. 

The noise itself sounds like a bearing going bad, has anyone had similar problems? Thanks in advance.

 

The dealer did not mention any of this so I could be able to get them to pay for repairs.

 

Here is a link which explains more than what I can do with words: 

 

 

 

Is one of the dash vents not fully open? That can create turbulence when the fan speed is high which will create noise in the situations you describe.

All dash vents are opened and blowing air, I will recheck but they should all be fully opened too. The weird thing is the air coming out of the vents decreases when the noise begins: It was blowing on maximum just prior to me taking the video.

If the blower motor has packed in don't worry. It's an easy DIY job and the part is about £160 from Skoda.

I checked the vents and all of them were fully open. I also tried recreating the noise today on a warm engine after driving ~10km and failed to do so even by turning the AC setting to Lo and blow to maximum. Seems to be heavily tied to either cold engine or hot cabin. It doesn't seem to be connected to recirculation either since turning it on or off when noise was active did nothing.

I'll probably have to get it checked and hope they can find the culprit. Just has to be a hot day so I can reproduce the fault on demand.

Fan motor baring noise. Time to change the blower....however....before you do that - as a check, can you please see what the status is of your cabin air filter. You might have a severe restriction in there. You might need a new filter.

Thanks for the reply, will check and change the filter too if needed. It probably needs a change as the air was a bit stinky on a rainy day.

50 minutes ago, Ratio said:

Thanks for the reply, will check and change the filter too if needed. It probably needs a change as the air was a bit stinky on a rainy day.

If you only purchased your car a few weeks ago and it was from a garage. It will be covered by used car warranty so let them repair it.

 

 

 

 

 

 

11 hours ago, Ecomatt said:

If you only purchased your car a few weeks ago and it was from a garage. It will be covered by used car warranty so let them repair it.

Really???  Good luck on trying to argue that one.  A new cabin air pollen filter - part no: 5Q0819653 is not expensive.  The genuine part is £17.86 (theskodashop.co.uk) here in the UK (about 20euros) or you can get patented parts for between 6-15 pounds or 8 to 18 euros.  I don't really think its worth trying to push that agenda.

Edited 1 June, 20215 yr by varaderoguy

1 hour ago, varaderoguy said:

Really???  Good luck on trying to argue that one.  A new cabin air pollen filter - part no: 5Q0819653 is not expensive.  The genuine part is £17.86 (theskodashop.co.uk) here in the UK (about 20euros) or you can get patented parts for between 6-15 pounds or 8 to 18 euros.  I don't really think its worth trying to push that agenda.

If it in the uk qnd it is the fan motor then yes it will be covered under the consumer rights act 2015. A lot of garages overlook a few things hoping the owner will just fix it themselves. 

Fan motor agreed it is definitely a warranty item. Filters and consumables not so clear-cut