No cold air!

The car wont be used for a week as its in Glasgow Audi's bodyshop getting the doors painted.

We'll see if it clears itself by the time the car returns; otherwise I'll need to get someone to have a look after a bit more reading on here.

Looks this is definitely an intermittent one - Picked the car up this morning and the AC blowing icy cold again. Will be doorstepping one of the VCDS gurus on my next road trip!
 
My daughter has just bought a low mileage 90 and on a 180 mile drive home all was working fine.

Today the heater was stuck on hot and would not go cold.
It appears to be either a sticking flap or could it be sensors telling the climate unit that heat is still needed.

I have done a scan and it shows just the 01271 error code for the flap motor, I cleared this but it still didn't work.
The error code did not reappear though.
It seems this has been an issue for some time as the OFF switch is well worn but I would like to get it sorted.

Where is the best place to start, the flap or the sensors?


If its the flap, which side are they in a RHD drive car.

Thanks
 
A new temperature control flap motor is around £100 to buy and I believe its a fiddly job with access being gained by removing the glove box. I would try lots of control flap rotations at first going rapidly from high to low on several occasions to try and free it.

The next thing to try would be a reset of the motor. "Timmus" plugged in his laptop and somehow reset mine... I,ll wait for others to elaborate on this....

Hope it all comes good for you.

Cheers

Dave
 
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Hi,

instructions on changing the motor:

http://www.a2oc.net/forum/showthrea...t-control-and-windscreen-demister-flap-motors

more details on the climate unit:

http://www.a2oc.net/forum/showthread.php?25089-Anatomy-of-the-A2-climate-unit

The most common fault is for the electrical connections to fail inside the motor casing. This causes either the motor not to move when driven or the position sensor to not report the movement (or both). The latter can cause the motor to run too far and make the gears end up misaligned, but this is only a symptom and not the problem. Quite often its intermittent (due to vibration when driving) so can work when tested with the car stationary. When the climate control detects something wrong it disables the motor and won't try and move it again until reset (when the ignition is turned off). With the temperature sensor, if you have an intermittent issue, as its thermostatic it will start on full heat when the engine is cold, be disabled during driving due to the fault and so stay there even when the engine and the cabin has warmed up.

I have not ever seen a motor jammed mechanically. If there is an electrical fault, running the motor end to end won't fix it (or "free" it as it isn't jammed mechanically). The internal gearing is very high so the motor cannot be moved by hand. This is normal.

There are two different motors fitted depending on model year and they aren't interchangeable, the fixings and electrical connections are different:

Up to mid 2004 model year: 6Q0 907 511
From mid 2004 model year: 6Q0 907 511 C

Note that the latter part is no-longer available from dealers and is superseded by 6R0 907 511.

I managed to get a old stock unused part of the original unit from eBay when I replaced mine. Its worth looking as they do come up occasionally.

regards

Andrew
 
Thank you for the comprehensive reply as to how to change the flap motor.

Sounds like it's the motor but I am not 100% sure.
Wasn't working this morning and then started working during a longish run this afternoon.

Is swapping the temperature sensors a sensible first shot or not?
If so which one needs to be changed.
 
Thank you for the comprehensive reply as to how to change the flap motor.

Sounds like it's the motor but I am not 100% sure.
Wasn't working this morning and then started working during a longish run this afternoon.

Is swapping the temperature sensors a sensible first shot or not?
If so which one needs to be changed.

Hi,

each vent outlet has its own individual temperature sensor so its unlikely that enough of them would have failed to cause an issue. This would be logged in the climate unit's faults if happened.

As you have seen the 01270 fault in the log, this is the climate control saying there is an issue with the motor. It is quite thorough in checking the operation as it tests both the circuit as well as the correlation between the motor drive and the position sensor. If the motor is energised but the position sensor doesn't detect any movement that will cause it to be disabled and the 01270 fault logged.

On mine, if I squeezed the case together it worked but stopped when I let go. It seems to be glued together but I haven't had a go at separating the halves to see if it can be fixed easily. Its probably only a failed solder joint but taking it apart is probably the hardest thing.

regards

Andrew
 
Pretty sure I have a stuck flap too - I can't get any air out of the bottom vents.

Hi,

the V70 central flap motor controls the airflow to both the foot well and dash directable vents at the same time. If you look at the pictures in the first post of this thread you can see that there are two arms controlling the flaps which have pins that run in tracks in the motor's wheel:

http://www.a2oc.net/forum/showthread.php?25089-Anatomy-of-the-A2-climate-unit&p=197127#post197127

It can be changed by removing the trim panel under the steering wheel and moving one of the brackets out of the way.

If you look at my G263 replacement thread you can see the procedure for removing and replacing the V70 motor.

http://www.a2oc.net/forum/showthrea...-temperature-sender-without-removing-the-dash

regards

Andrew
 
Not sure if the A2's HVAC positioning motor flaps are similar but came across this 'How To' on stripping and cleaning the potentiometer tracks

If anyone has a failed unit it would be great to give it a try and report back


Cheers Spike
 
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