Now that ive been using my heater in the cold weather it seems to be jamming on hot or cold and the temperature control does very little unless its all the way to the left or the right.

If it gets stuck I can usually manage to move the dial from hot to cold and it will eventually respond.

I have the following faults from VCDS, i would ignore the top fault about control module failure as i have the same type of fault for a number of other modules on the car

-------------------------------------------------------------------------------

Address 08: Auto HVAC       Labels: 6Q0-820-045.LBL

   Controller: 6Y0 820 045

   Component: Klimaanlage        X0840

   VCID: F297780FADB7

5 Faults Found:

65535 -  Internal Control Module Memory Error

            00-00 -   -

01596 -  Motor for Outside/Recirculated Air Flap (V154)

            30-10 -  Open or Short to Plus - Intermittent

01271 -  Positioning Motor for Temperature Flap (V68)

            29-10 -  Short to Ground - Intermittent

01596 -  Motor for Outside/Recirculated Air Flap (V154)

            09-00 -  Adaptation Limit Surpassed

01596 -  Motor for Outside/Recirculated Air Flap (V154)

            55-00 -  Adaptation Not Successful

 

-------------------------------------------------------------------------------

 

Edited 11 November, 20178 yr by clarendon462

Have you tried running "basic settings" on that module?  It sounds like the temperature flap motor has a problem. I've found in my old Passat that when the Outside/Recirc motor has problems, the distribution of air gets messed up and less than normal volumes of air gets through to the car outlets. 

1 minute ago, rum4mo said:

Have you tried running "basic settings" on that module?  It sounds like the temperature flap motor has a problem. I've found in my old Passat that when the Outside/Recirc motor has problems, the distribution of air gets messed up and less than normal volumes of air gets through to the car outlets. 

I have done those yes, and it comes up with adaptation unsuccessful for the recirc flap. It doesnt work at all when you press the button

I can understand that, but what happens when you try to run basic setting on the temperature flap motor as it claims to only have an intermittent fault?

 

That temperature flap motor might just be almost reachable, I replaced that on my old Passat, the Outside air/Recirc motor was harder to reach, dash out so I left it alone.

Edited 11 November, 20178 yr by rum4mo

I have also done that and it seems to be working fine. The values of the switch seem to match up to the values of the flap when i did the test

I think that the trouble might be that when you run basic settings the pot voltage values are checked at both (flap motor) end stop limits and so if everything is good your control will work as intended at all points between these end stops, what you normally find is, that the pot track gets dirty electrically round about the normal setting(s) positions, so that is still going to be a problem. What I used to do, when it was intermittent and I was too lazy was, demand Low <>High about 10 times waiting each change until the flap motor has reached its next position, what I was trying to achieve was to clean up the pot track enough at that area of operation to keep things working enough - though my problem was hot air in hot weather - which like cold air in cold weather is not too handy!

So do you think a new control panel would be the answer?

I a log with one of the faults you have to my local expert and they recommended changing the motor(s).

I am not certain how the flap position is sensed, if it was a pot then that would explain the limited life.

5 years later the spare motor is still on the shelf.......

I have the controller memory error aswell and my theory on the controller memory error is that too many errors have possibly corrupted the EEPROM area in the controller module.

 

9 hours ago, clarendon462 said:

So do you think a new control panel would be the answer?

 

That would be easy to replace but maybe too extreme - unless you had access to one to get a loan of.

Well i was thinking a second hand one from my local scrappy. dont want to go spending money tho if it wont resolve it

 

4 hours ago, garethw said:

I a log with one of the faults you have to my local expert and they recommended changing the motor(s).

I am not certain how the flap position is sensed, if it was a pot then that would explain the limited life.

5 years later the spare motor is still on the shelf.......

I have the controller memory error aswell and my theory on the controller memory error is that too many errors have possibly corrupted the EEPROM area in the controller module.

 

 

Ha Ha, my new flapmotor assembly lived in the boot for quite a few years as well, then I bumped into a posting on the Passat forum that said it was possible to do if you had tenacity and willing to suffer some pain - and it was!

1 minute ago, clarendon462 said:

Well i was thinking a second hand one from my local scrappy. dont want to go spending money tho if it wont resolve it

 

 

You know the first thing that I bought to hold as a spare part was a NOS Climatronic controller for my 2000 Passat - never needed it. To make things worse, the first thing that I bought as a spare part for my wife's 2002 Polo was also a Climatic digital control module - never needed it! So far I've resisted repeating that mistake with our current cars, mainly because I have not bumped into any NOS items going for a song, so maybe I'll regret that!

 

Trouble with buying from a scrappy is - how can you be sure that it will be in proper working order, I'd think that it would be as is the one currently fitted to your car, so getting a quick loan of a working one seems a better plan to let you dismiss this as being the root cause of your problem.

Grab another V68 and stick it on.

How easy is that to replace? The part seems expensive so i might try get one used and take a risk. They can't all be bad?

A good plan if you like gambling, otherwise, in answer to your "They can't all be bad" - well they all start off being good, but time plays its part on them and so most if not all will eventually suffer from pot track issues, ie lose the feedback signal.

where would be the best place to get a new one then? I suppose i should phone the dealer and find out

13 hours ago, clarendon462 said:

How easy is that to replace? The part seems expensive so i might try get one used and take a risk. They can't all be bad?

 

Haven't done it myself, but I doubt you'll have too much trouble, knowing your general aptitude. 

Over a hundred new, I should think, so well worth a  gamble on a secondhand one.  I can look up the erWin instructions if you like?

31 minutes ago, Wino said:

 

Haven't done it myself, but I doubt you'll have too much trouble, knowing your general aptitude. 

Over a hundred new, I should think, so well worth a  gamble on a secondhand one.  I can look up the erWin instructions if you like?

If its not too much trouble. I think its located down the drivers side of the centre console from the footwell.

Theres plenty of fabias at the local breakers so i think i should be able to find a few to try.

Im wondering if the old one could be dismantled and cleaned?

Think it's actually passenger side.

In between pollen filter casing and main bulk of the heater box. This pic shows it with pink connector (would face downwards in the car, as you can see the pollen filter entrance is horizontal in this shot):

 

Edited 13 November, 20178 yr by Wino

Thanks for that @Wino i will give it a go

I managed to remove the motor today, was relatively easy once glovebox and footwell vent were removed. Oh and that annoying piece of lower dash trim that is really difficult to get out.

I dismantled the motor assembly and tried squirting the pot with electrical cleaner and working it back and forth. I then reassembled and plugged the motor in out of position to test with vcds.

It was showing that whatever value was 'specified' was being displayed in the 'actual' as well and the motor would respond ok. - i think this means it is working fine.

What i did notice however is that extreme hot or cold would always give their highest and lowest values respectively. 237 and 23 i think they were.

However in between the two temperature extremes the values were all over the place. For example, turning the control just slightly above the cold setting would cause the value to go from 23 to 200 or so. Then turning it any more would make no difference until it reached max and it would jump to 237. Turning it down right down before the lowest temperature would still give in the region of 180-200 value until you hit the last notch it would go back to 23. Is this normal behaviour or is my control unit the issue?

 

I have the same problems myself, I bought a new  V68 motor one and the problems ended. The new installation needed to make sure the installation is right! Otherwise, the adjustment will not work properly

11 hours ago, FinnVrs said:

I have the same problems myself, I bought a new  V68 motor one and the problems ended. The new installation needed to make sure the installation is right! Otherwise, the adjustment will not work properly

Do you mean you had to set it up with VCDS? 

On 15/11/2017 at 15:14, clarendon462 said:

I managed to remove the motor today, was relatively easy once glovebox and footwell vent were removed. Oh and that annoying piece of lower dash trim that is really difficult to get out.

I dismantled the motor assembly and tried squirting the pot with electrical cleaner and working it back and forth. I then reassembled and plugged the motor in out of position to test with vcds.

It was showing that whatever value was 'specified' was being displayed in the 'actual' as well and the motor would respond ok. - i think this means it is working fine.

What i did notice however is that extreme hot or cold would always give their highest and lowest values respectively. 237 and 23 i think they were.

However in between the two temperature extremes the values were all over the place. For example, turning the control just slightly above the cold setting would cause the value to go from 23 to 200 or so. Then turning it any more would make no difference until it reached max and it would jump to 237. Turning it down right down before the lowest temperature would still give in the region of 180-200 value until you hit the last notch it would go back to 23. Is this normal behaviour or is my control unit the issue?

 

Had a very quick look just now. The 23-200 thing happened with just small adjustment upward, but quite slowly, over a minute or two? Then I got interrupted...

7 hours ago, clarendon462 said:

Do you mean you had to set it up with VCDS? 

 

Watch this video and the time is 19:09 the man's thumb will show you the point you have to be right. In 19.23 you will see what should be put on that gear.

If part of v68 is new it should go right. For the used parts, the situation is different because you can not know in which position the part has been removed.

The part of 19.23 must also be in the correct position.

After installation, it is good to make an adaptation using the VCDS program, for example