I have a 2004 B6 Audi A4 Quattro with APR K04 upgrade kit. A few months back, the AC got stuck in ECON mode. I have tried replacing both the G65 and the console HVAC controller, but neither has been able to rectify the issue. The EMC seems to be sending full 12 V through the signal wire, which is preventing the AC from kicking on (as return is then 12V and reads as max pressure from the G65). I have traced back the wires, and there seem to be no shorts. I took the car to Audi, and they confirmed that the AC blows cold if they manually cycle the compressor. I have tried in vain to use VCDS to clear the fault codes, and there seems to be little information on SHUT-OFF CODE 4 on the web. I think I somehow need to clear or disable the number 4 shut-off code, as it is stuck on. Here is some info from the VCDS readouts. Any advice would be greatly appreciated (I'll even paypal you $40 if you can help me fix it!). I've spent about 12 hours myself, and 2 hours shop time with Audi and there's no solution in sight. SoCal is not much fun without AC!
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Address 08: Auto HVAC (8E0 820 043 AD)
16:25:23 Group 002: Compressor Shut-Off Criteria
4.0 Current Shut-Off Criteria
0.0 Last Shut-Off Criteria
0.0 Second to Last Shut-Off Criteria
0.0 Third to Last Shut-Off Criteria
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Address 08: Auto HVAC Labels: 8E0-820-043.lbl
Control Module Part Number: 8E0 820 043 AD
Component and/or Version: A4 Klimaautomat 1324
Software Coding: 00000
Work Shop Code: WSC 63351
VCID: 63CBA326F191BF5994-5178
3 Faults Found:
01172 - Temperature Sensor; Driver's Heated Seat (G59)
30-00 - Open or Short to Plus
01171 - Temperature Sensor; Passenger Side Heated Seat (G60)
30-00 - Open or Short to Plus
00819 - High Pressure Sensor (G65)
30-00 - Open or Short to Plus
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Address 08: Auto HVAC (8E0 820 043 AD)
16:25:23 Group 002: Compressor Shut-Off Criteria
4.0 Current Shut-Off Criteria
0.0 Last Shut-Off Criteria
0.0 Second to Last Shut-Off Criteria
0.0 Third to Last Shut-Off Criteria
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Address 08: Auto HVAC Labels: 8E0-820-043.lbl
Control Module Part Number: 8E0 820 043 AD
Component and/or Version: A4 Klimaautomat 1324
Software Coding: 00000
Work Shop Code: WSC 63351
VCID: 63CBA326F191BF5994-5178
3 Faults Found:
01172 - Temperature Sensor; Driver's Heated Seat (G59)
30-00 - Open or Short to Plus
01171 - Temperature Sensor; Passenger Side Heated Seat (G60)
30-00 - Open or Short to Plus
00819 - High Pressure Sensor (G65)
30-00 - Open or Short to Plus
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