Hi,

Octavia, 2007 mod. elegance with climatronic was parked outdoors for nearly 3 weeks during our vacation. At coming back and starting the car I noticed the fan for the passenger cabin ventilation is not working.

 

- I do not get any error or other unusual message on the climatronic display.

- The climatronic displays the speed level which the fan is expected to run at as it normally would but the fan does not work.

- I played arround with all settings at the climatronic panel that I could think of, to no result.

- I started and stoped the engine, that did not help either.

 

I tried a search, but did not find anything that seemed to fit (maybe wrong searchwords or my dodgy English).

 

My questions:

Is this a common failure?

What should I check first, second...

Is the a "how-to" if more complicated tasks should be necessary?

 

Thanks in advance for any help!

Get vcds pluged in to see if theres a fault on the ecu. If there is try a fan calibration, theres how tos on here to this but dont have a link to hand. For vcds check on the vcds section to find some one near you for this.

Hi,

thanks a lot for the reply!

 

Meanwhile I did the following:

 

• Checked the fuse (according to what I found it is fuse nr. 40 in the fuse panel at the side of the dash). It's a 30 amp and it is ok.
• Removed the fan and checked it physically. No foreign object found and it rotates freely.
• Detached the electronic module (which I believe is for the speed control) from the motor.
• Measured the electrical resistance of the motor windings: 6,5 ohm
• Checked for failure codes by using for the first time my OBD scan and the app on my tablet. I hope i did everything right...   . However, the tablet did connect to the OBD and after I switched on the ignition, it also stated to be connected to the ECU. I searched for failure codes (actual and cleared ones), non was found.

 

My questions now:

 

1. Would it do any harm if I would connect the fan-motor (without the electronic unit) to 12V DC to see if it runs? If it does that, would that proof that the motor is entirely ok? Would it proof that the failure is in the electronic unit which I believe is the speed control?
2. Is there any way to check the electronic unit (is there a fuse or something that could give a clue)?
3. Anything else that I could check?

Again, thanks a lot in advance for any help!

Edited 2 August, 201312 yr by jogo

Try a vcds scan as this will check everything fir faults where as some of the mobile apps only bring up engine faults and no conviniance faults. And personaly I rackon doing what you said puting a 12v suply through wont harm the fan. But thats as far as my knoladge goes to be honest. Sory couldbt be more help.

Thanks a lot for your quick reply Matt!

I was not aware that the scan might not bring up all errors.

Hello!

 

I had exactly the same problem but my fan runs a little bit tight, that have made the solderings to the copper resistor in the controlunit have been overheated.

Did solder them and now it runs fine... Gonna change the fan later.

Into the controlunit you have 2 small and 2 thicker leads. Between the thick ones you should have 12V DC.

If you put your multimeter into AC you should have around 1,5v up to maybe 2,7v between the thin leads, most important is that you can see a difference when you adjust the fanspeed.

I havent meassured the output from the controlunit.

 

Look very carefully at the solderings because it very hard to see if they are bad.

Went out too the car for a second look at the fan and it seems to be the bottom bearing that is stuck.

The bearing rotates with the axle.

I drilled a little hole at each side of the bearing and turned it loose from the axle with a pliers.

Put some oil into the bearings and ran the fan for a liitle while, not too long because the fan cools the controlunit.

Now the fan runs very good again.... Happy me, saved som money....

Hi Po1968,

thanks for your valuable replies . I was away for couple of days therefore I did not them before now.

 

When I had the fan out and turned it by hand, I would have said it turns easily. I therefore did not suspect anything wrong with the fan as also the resistance of of the motor winding seemed ok.

As I could not find anything wrong anywhere, I thought I could just lubricate the visible bearing a bit (it showed som sort of corrosion on the outside) and try the fan once more. Strangely (and gladly) it works and has done now for a week or so...

 

I just hope it stays that way.