Technical Faint tick in heater.

[deconstruction]

Gurus!

On my '99 Multipla 1.6 ELX (airco) - which is left-hand-drive - I've noticed a very faint noise from somewhere inside the heater when the car is being driven i.e. ignition on.
I'm convinced that it's too regular to be a living creature
It seems to issue from within the dashboard / heater-assembly above the right-hand-side footwell, every 15 seconds or so, a very soft click as if something is oscillating between two positions i.e. from left to right or up to down, so two movements each time.
I visualise a little flap with soft or brush-like edges, opening and closing, or trying to, which is what worries me because this happens whenever the car is being used. So hundreds of times on a long journey. :bang:


Heater and airco work normally.
Silence when the ignition is switched off.

Does anyone recognise this weirdness? Is anyone familiar with the intimate regions of the heater assembly?

Thanks for your ideas! :worship:

 

[deconstruction]

Just found this: http://4cardata.info/elearn/186/2/2006203/2000602/2001594/2888275

But still grateful for advice.

 

[Oletimer]

It'd help if you'd said what you'd tried so far.

Does this happen with only the ignition on but motor not running?

Have you tried adjusting flap settings from floor to screen etc?

Fan speed? Etc Etc etc

 

[varesecrazy]

Sounds like other kit within the dash to me..

However

Personally I would remove the fan unit

Leave it in the boot while you then

Power up the car ( not run the engine )

If it is still ticking.. you can stick your head in the spot where the fan lived

Does it sound louder?

If so it could be a flap actuator

If no louder.. probably related to the instrument cluster

 

[deconstruction]

Thank you for the suggestions, I shall investigate how to remove the fan.