2002 Audi A4 B6 "Battery & A/C Compressor Questions

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Benjisan265

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First let me say hello to "Jack" and hope everybody is getting on well with life.

So here's my quick questions:

1. Does installing a new battery for my year Audi require new battery coding?

I had VCDS hooked up and couldn't find any controller information installed modules for the battery. I watched RossTechVCDS YouTube and none of the options in that video are available for me. So can I just put the new battery in without any worries?

2. Can someone tell me if its normal for my model year cars air conditioning not provide excellent cooling at idle?

When my car RPMS are over 1200 or there about the A/C works great, but at idle 700 RPMS or so I only get hot air. I think I read somewhere that these cars have variable compressors and I have no clue as to what that means. Perhaps my drive belt is slipping, but it looks to be great shape and I replaced it about two and a half years ago when I got the car.

Any thoughts on these couple of questions would greatly be appreciated.
 
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PetrolDave

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1. The A4 B6 does not have any battery management, so no battery coding is needed or even possible.

2. On all of the B6/B7 A4/S4/RS4's I've previously owned the A/C worked fine even at tickover.
 
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Benjisan265

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1. The A4 B6 does not have any battery management, so no battery coding is needed or even possible.

2. On all of the B6/B7 A4/S4/RS4's I've previously owned the A/C worked fine even at tickover.


Okay that's what I was actually believing the situation was with regards to the battery.

I'm going to borrow my friends gauges and take a look at the A/C pressures.

Is there anything that I could look at with the VCDS software in the HVAC controller that would lend a clue as to why at idle the system seems weak.

Here's a auto scan. This is right after the battery install and the car wasn't driven just sitting in the driveway.

Code:
VCDS-Lite Version: Release 1.2
Monday, 21 June 2021, 19:44:06:18369


Chassis Type: 8E - Audi A4 B6
Scan: 01,02,03,08,09,0F,11,15,16,17,18,36,37,45,46,55,56,57,65,67,69,75,76,77
 
-------------------------------------------------------------------------------
Address 01: Engine       Labels: 06C-909-559-ASN.LBL
   Controller: 8E0 909 559 D
   Component: 3.0L V6/5V      G   0002
   Coding: 0016751
   Shop #: WSC 63351
   VCID: 361FE21A015F
No fault code found.
Readiness: 0110 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans       Labels: 01V-927-156.LBL
   Controller: 8E0 927 156 Q
   Component: AG5 01V 3.0l5V  USA 1213
   Coding: 0001002
   Shop #: WSC 06117
   VCID: 3C0BF0323F73
No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes       Labels: 8E0-614-517.LBL
   Controller: 8E0 614 517 A
   Component: ABS/ESP allrad      1726
   Coding: 04497
   Shop #: WSC 06479
   VCID: 263F325AD1FF
1 Fault Found:
01826 -  Sensor for Steering Angle (G85); Supply Voltage Terminal 30
            35-00 -   -

-------------------------------------------------------------------------------
Address 08: Auto HVAC       Labels: 8E0-820-043.LBL
   Controller: 8E0 820 043 G
   Component:   A4 Klimaautomat   0712
   Coding: 00000
   Shop #: WSC 63351
   VCID: 253D3556ACF9
2 Faults Found:
01592 -  Air Quality Sensor (G238)
            37-00 -  Faulty
65535 -  Internal Control Module Memory Error
            00-00 -   -

-------------------------------------------------------------------------------
Address 09: Cent. Elect.       Labels: 8E0-907-279-8E2.LBL
   Controller: 8E0 907 279 E
   Component: int. Lastmodul  USA 0204
   Coding: 00013
   Shop #: WSC 63351
   VCID: 341BD8121723
No Faults Found.
  

-------------------------------------------------------------------------------
Address 15: Airbags       Labels: 8E0-959-655-84.LBL
   Controller: 8E0 959 655 A
   Component: Airbag 8.4E         3000
   Coding: 0010607
   Shop #: WSC 63351
   VCID: 351DE5161C59
1 Fault Found:
01739 -  Crash Sensor for Front Airbag; Pass. Side (G284)
            011 -  Open Circuit - Intermittent

-------------------------------------------------------------------------------
Address 16: Steering wheel       Labels: 8E0-953-549.LBL
   Controller: 8E0 953 549 L
   Component: Lenksáulenmodul     0308
   Coding: 01141
   Shop #: WSC 63351
   VCID: 3C0BF0323F73
No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments       Labels: 8E0-920-9xx-8E2.LBL
   Controller: 8E0 920 980 KX
   Component: KOMBI+WEGFAHRS. RB4 D30
   Coding: 00201
   Shop #: WSC 00001
   VCID: 8C6BE0F2AF53
   WAULT68E52A099660     AUZ6Z0A0208491
1 Fault Found:
01300 -  Control Module for Navigation with CD-Rom (J401)
            49-10 -  No Communications - Intermittent

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr       Labels: 8E0-959-760.LBL
   Controller: 8E0 959 760 
   Component: Sitzmemory R2 F     0201
   Coding: 00002
   Shop #: WSC 63351
   VCID: F1959106A8B1
No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation       Labels: None
   Controller: 4B0 919 887 D
   Component: BNS 4.1 H05    BNO 0005
   VCID: 341BD8121723
No fault code found.

-------------------------------------------------------------------------------
Address 45: Inter. Monitor       Labels: 8E0-951-177.LBL
   Controller: 8E0 951 177 
   Component: Innenraumueberw.   0504
   Coding: 00001
   Shop #: WSC 00000
   VCID: EBA9836E8A9D
No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.       Labels: 8E0-959-433-MAX.LBL
   Controller: 8E0 959 433 T
   Component: Komfortgerát T5B    0616
   Coding: 11788
   Shop #: WSC 63351
   VCID: 42F78ECA5D97
1 Faults Found:
01562 -  Right Rear Door
            59-10 -  Can't Unlock - Intermittent

-------------------------------------------------------------------------------
Address 55: Xenon Range       Labels: 4Z7-907-357.LBL
   Controller: 4Z7 907 357 
   Component: dynamische LWR       D06
   Coding: 00060
   Shop #: WSC 63351
   VCID: 047B48D20703
No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio       Labels: 8E0-035-1xx-56.LBL
   Controller: 8E0 035 195 A
   Component: symphony II NP2    0008 
   Coding: 00201
   Shop #: WSC 00000
   VCID: 253D3556ACF9
No fault code found.

End   --------------------------------------------------------------------------------------------------
 
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Uwe

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Is there anything that I could look at with the VCDS software in the HVAC controller that would lend a clue as to why at idle the system seems weak.

MVB 001 in the HVAC controller has:
1. A/C Valve (N280) Current
2. A/C Valve (N280) Duty Cycle
3. High-Pressure Signal (G65)
4. Refrigerant Circuit Pressure

However, looking at this via the HVAC controller is a poor substitute for connecting actual high-side and low-side pressure gauges.

-Uwe-
 
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Benjisan265

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Sorry to have to tell you @Benjisan265, Jack succumbed to Covid 19 a few months back. Please see this thread:

A Sad Day

That's very sad news for me to hear Bruce. Jack was a genuine and unique person that would go out of his way in order help strangers here on the forum. Jack helped me with an instrument cluster calamity on my Audi that he didn't have to go to the levels that he did and refused to accept any payment for his time and expertise. He even gave me a working instrument cluster for no charge so that I could get my car up and running ASAP.

A good man indeed and a great asset to the forum as he will always be remembered for his gruff approach when you first interact with him. Ive talked to him on the phone on several occasions and his gruff quirky persona here didn't materialize in those conversations and you could really tell that he was really a teddy bear with a big heart that liked to solve problems no matter how big or how small.

I hope his family is staying strong and I pray Jack is resting in peace.
 
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Benjisan265

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MVB 001 in the HVAC controller has:
1. A/C Valve (N280) Current
2. A/C Valve (N280) Duty Cycle
3. High-Pressure Signal (G65)
4. Refrigerant Circuit Pressure

However, looking at this via the HVAC controller is a poor substitute for connecting actual high-side and low-side pressure gauges.

-Uwe-
Hi Uwe,

Still can't rap my head around that Jack is gone and for some reason I feel odd even asking for help now as the shock is messing with my head.

I suppose Jack would be like... hey fellows just get on with things here as I'm still looking down here and will work my magic in other ways.

So in that spirit and with Jack's blessing.

Doesn't the VCDS have some testing capabilities with the HVAC controller in 03 that could be beneficial in help diagnosing the A/C not performing well at idle?

I had the gauges hooked up this evening and the low and high pressures are fine.

Any thoughts you have would greatly be appreciated.
 
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Bruce

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That's very sad news for me to hear Bruce. Jack was a genuine and unique person that would go out of his way in order help strangers here on the forum. Jack helped me with an instrument cluster calamity on my Audi that he didn't have to go to the levels that he did and refused to accept any payment for his time and expertise. He even gave me a working instrument cluster for no charge so that I could get my car up and running ASAP.

A good man indeed and a great asset to the forum as he will always be remembered for his gruff approach when you first interact with him. Ive talked to him on the phone on several occasions and his gruff quirky persona here didn't materialize in those conversations and you could really tell that he was really a teddy bear with a big heart that liked to solve problems no matter how big or how small.

I hope his family is staying strong and I pray Jack is resting in peace.
Thank you for your kind remembrance. I see you posted in the thread about Jack:
A Sad Day

We plan to keep that thread in remembrance. We miss Jack's gruff quirky persona. He was a real teddy bear. He was a very caring and IMHO, a great man!

Back to your thread and resolving your troubles. I am not able to add to that discussion.
 
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Uwe

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Doesn't the VCDS have some testing capabilities with the HVAC controller in 03
This is an old K-line module. Output tests, if the module even supports them, are whatever is programmed into the sequence in the module.

-Uwe-
 
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Benjisan265

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What were the low and high pressures, both at idle and above 1200rpm?
This is an old K-line module. Output tests, if the module even supports them, are whatever is programmed into the sequence in the module.

-Uwe-
Hi Petrol Dave

I don't have the gauges at the moment as my friend stopped by yesterday and hooked his up for the readings and took the gauges with him when he left.

But I do recall the low side was around 37 psi and the high side was around 180 at idle. Slightly revved up the low side was around 42 and the high side was about 210 psi but the temps here yesterday was only in the low 80's

Hi Uwe

I was able to run an output test in 03 and it went through everything. It turned on the compressor, the fans and all the positions for the vents, blower, blend door motors and heated seats.

All looked okay.
 
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Benjisan265

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Thank you for your kind remembrance. I see you posted in the thread about Jack:
A Sad Day

We plan to keep that thread in remembrance. We miss Jack's gruff quirky persona. He was a real teddy bear. He was a very caring and IMHO, a great man!

Back to your thread and resolving your troubles. I am not able to add to that discussion.
Hi Bruce.

Yes, I didn't see the link in your post at first when you told me about Jack and I was completely caught off-guard and dumbfounded as I couldn't believe he was gone since he was a relatively young man, not a elderly senior citizen.

Jack called me a couple of times after he had helped me out to just see how things were going with my car as I hadn't posted here for awhile and he thought I may have sold it.

The Jack I talked to was an amazing guy in his own way.

Not the least be selfish or uncaring.

I'm still in shock.
 
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Benjisan265

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Well I got the A/C straightened out.

Turns out it was the new aftermarket high pressure safety switch I had purchased from RockAuto and installed about a week and a half ago. The RockAuto one was proven to be defective internally when my friend temporally swapped in one from his sisters VW.

Got a VAG one from the dealer, installed it and the A/C is working great at idle now.
 
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Uwe

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Chinese Replacement Auto Part strikes again! ;)

-Uwe-
 
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stefdds

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It would sure be illustrative if a forum "section" was created that was titled "Aftermarket part(s) complications" ; the above thread and others like it (with aftermarket parts found to be non-functional or in this case partially functional) could be CC'ed to it. Just a thought ; it may be difficult to categorize all the different years, models, etc. to make it searchable.

Ben, Thanks for the follow-up #13 post!
 
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Benjisan265

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It would sure be illustrative if a forum "section" was created that was titled "Aftermarket part(s) complications" ; the above thread and others like it (with aftermarket parts found to be non-functional or in this case partially functional) could be CC'ed to it. Just a thought ; it may be difficult to categorize all the different years, models, etc. to make it searchable.

Ben, Thanks for the follow-up #13 post!

No problem stefdds as I never like to leave things with loose ends.

And not for nothing, but the customer service department at Rockauto is taking the defective part back and giving me a full refund. The did offer to send me a replacement part, but I declined since it wasn't sitting well with me after spending several days trying to figure this A/C issue out.

Plus I needed my A/C ASAP as the high heat is going to be here Saturday and all for the next week too.
 
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