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Help! Clicking Aircon Recycle Fan? ...with video!


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#1 Chubbs

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Posted 25 June 2020 - 01:27 pm

I wonder if anyone knows about this problem...

 

2 days ago I started the car and CLICK CLICK CLICK CLICK - quite loud and coming from the top of the dashboard, behind the 3 binnacles (love the word binnacles). It only happens when the aircon 'recycle' button is activated (which of course happens automatically in this hot weather).

 

What is it and can I do a DIY (destroy it yourself) fix?

 


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#2 Gav C

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Posted 25 June 2020 - 08:00 pm

Sounds like something is caught inside somewhere, have you tried different fan speeds?


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#3 Chubbs

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Posted 26 June 2020 - 06:30 pm

Sounds like something is caught inside somewhere, have you tried different fan speeds?

Good thinking - I'll try it.

 

Edit - however, it seems too regular to be a foreign object stuck inside.

 

Anyone know how hard/easy it is to access the area below the dashboard aircon grille at the bottom of the windscreen?


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#4 Puddenchucker

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Posted 27 June 2020 - 10:01 am

There's a flap which controls whether fresh air comes into the cabin from the outside or is recirculated within the cabin.

From your description & video it could be the flap, for some reason, isn't fully opening or closing.

This could be due to a foreign object preventing the flap from reaching the fully open/closed position and consequently the motor is continually trying to move the flap and the gear mechanism is jumping teeth - hence the clicking.

Or, there are broken/missing teeth on the gear mechanism, causing the clicking, which again could mean the flap isn't reaching the full open/closed position and consequently the motor is constantly operating.

 

Disclaimer: I'm not a vehicle mechanic so could be wrong. :mellow:  :unsure:  :?:

(Heating/Ventilation units in modern cars are usually buried deep behind the dashboard and a PITA to get to)


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#5 Chubbs

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Posted 27 June 2020 - 10:59 am

There's a flap which controls whether fresh air comes into the cabin from the outside or is recirculated within the cabin.

From your description & video it could be the flap, for some reason, isn't fully opening or closing.

This could be due to a foreign object preventing the flap from reaching the fully open/closed position and consequently the motor is continually trying to move the flap and the gear mechanism is jumping teeth - hence the clicking.

Or, there are broken/missing teeth on the gear mechanism, causing the clicking, which again could mean the flap isn't reaching the full open/closed position and consequently the motor is constantly operating.

 

Disclaimer: I'm not a vehicle mechanic so could be wrong. :mellow:  :unsure:  :?:

(Heating/Ventilation units in modern cars are usually buried deep behind the dashboard and a PITA to get to)

 

Thank you so much, Pud. That sounds like an excellent diagnosis. Glad you're still here!


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#6 JohnFK

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Posted 27 June 2020 - 03:43 pm

Do you eat Tic-tacs when you are driving? Just a thought... 🤣🤣

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#7 Chubbs

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Posted 27 June 2020 - 03:54 pm

Update:

 

Just been out to test Gav's theory and see if Pud's thoughts tally with the noise and guess what...

 

One single click and then completely back to normal. No clicking at all.

 

I've been toying with the idea that it could be heat-related, as the dashboard of my car has been subject to some massively hot temperatures in the driveway lately (south-facing, blazing sun) - and today is markedly cooler.

 

It's either that, or if there was an object stopping the flap from working properly it may have become dislodged.

 

Time will tell if the noise has gone for good, or it's just a temporary respite.


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#8 Chubbs

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Posted 27 June 2020 - 06:09 pm

I spoke too soon.

 

The click is back, so it's not heat-related.


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#9 Neutreus

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Posted 28 June 2020 - 08:28 am

Damn, just 'liked' the post where you said it was sorted then viewed the one above  :tomaatit:

 

Hope you find the issue .................... 


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#10 JohnFK

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Posted 28 June 2020 - 08:41 am

I know this will sound weired but have you thought of using one of those flexible optic viewers to see what going on down the vent?
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Champagne R35 GT-R MY15 Premium 45th Anniversary Edition - The Expensive Mistress
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Blade Silver Juke NISMO Manual - Dumbo

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MY11 with Recaros - The General
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#11 Ste_ac

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Posted 28 June 2020 - 08:53 am

Hi,
Just a thought, maybe you could remove the glove box and then the cabin air filter which is behind it to possibly get a view or feel further down into the duct to any mechanism down there?
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#12 Chubbs

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Posted 05 July 2020 - 08:39 am

...and to make matters even worse, now my bean-to-cup coffee machine isn't grinding properly.


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