B7 Models Please discuss all 2005.5 - 2008 B7 A4 topics here...

Please help!!

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Old Jul 12, 2021 | 07:53 PM
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Basaraski's Avatar
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1st Gear
Joined: Jun 2021
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Default Please help!!

2005.5 Audi A4 B7
185k miles - 6-speed
Can not figure out this Aircon problem for the life of me, Any help or ideas greatly appreciated

Late last summer my AC randomly stopped working after I fixed it by replacing the pressure sensor (G65) and giving it a new charge. Was cold as ice. Threw the issue under the rug as it was about fall time. Fast forward to now, hours of research and part replacing. No A/C.

So let me start with what I HAVE replaced:

Hi-Pressure sensor G65 (couple years ago)
All 3 relays under the ECU (couple years ago)
Entire fan assembly (last month)
Fan control module (last month)
Climate Control unit (last month)

I had replaced the fans because the A/C fan wasn't turning on, thought that was my culprit and that would be it. replaced the FCM just in case. Tried running 12v to my old fan, no go. Replaced the entire assembly. Now both fans turn on.

So then, stumped... I decided to purchase VCDS. To find out what was causing no AC

It seems my compressor is engaging. My fans are engaging. I have 5.0 BAR pressure... so why still no air??

Here are some logs. If anything else needed just let me know

Address 08: Auto HVAC Labels: 8E0-820-043.lbl
Control Module Part Number: 8E0 820 043 BL
Component and/or Version: A4 Klimaautomat 3233
Software Coding: 00000
Work Shop Code: WSC 00000
VCID: 6C81CD3CFF91B69B43B-5160
3 Faults Found:

00604 - Potentiometer Positioning Motor for Air Flow Flap (G113)
30-00 - Open or Short to Plus
01794 - Control Module - Incorrect Chassis (VIN) Number
35-00 - -
01332 - Door Control Module; Passenger Side (J387)
49-00 - No Communications
Monday,12,July,2021,18:54:43:42015
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 21.3.0.0 (x64) HEX-V2 CB: 0.4544.4
Data version: 20210226 DS325.0
www.Ross-Tech.com
In regards to the G113 code. Could that stop A/C airflow? As my research tells me, its the flap right up against the box where your cabin air filter is. To check, I removed the filter and the flap never opened when messing with the aircon, or running output tests. Also to note, when I turn ECON ON, no air leaves the vents, but I can hear air flowing. Is this just an issue for recirculation air (ECON) or is this also why I'm not getting A/C. Another note, I also don't get heat in the winter.

Here are some measuring blocks showing my compressor is engaging, and a signal from G65

Address 08: Auto HVAC (8E0 820 043 BL)

18:57:09 Group 001
0.644 A A/C Valve (N280) Current
62.4 % A/C Valve (N280) Duty Cycle
20.0 % High-Pressure Signal (G65)
5.0 bar Refrigerant Circuit Pressure

18:57:09 Group 002: Compressor Shut-Off Criteria
0.0 Current Shut-Off Criteria
1.0 Last Shut-Off Criteria
3.0 Second to Last Shut-Off Criteria
1.0 Third to Last Shut-Off Criteria
I'm really stumped here, and any insight would help a ton. It's been crazy hot here on the east coast and I can only do without air for so long. If you have any questions or need me to test something please feel free to comment. Thanks
 
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