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Thread: No hot air, heater not working in Audi A4 2014 - N422 Stop Valve error

  1. #1
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    No hot air, heater not working in Audi A4 2014 - N422 Stop Valve error

    Hi there

    I recently bought a VCDS to troubleshoot a heating issue we have with our car (Audi A4 B8 8K 2014 Quattro).

    The car doesn't overheat, so I don't think it is the water pump (although my mechanic mate reckons they tend to fail quite a bit). I think it could be the heater control valve (or also known as a stop coolant valve)... This is the error code I captured last night from the VCDS:

    Code:
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC (J255)       Labels: Redir Fail!
       Part No SW: 8K2 820 043 S    HW: 8K2 820 043 S
       Component: KLIMA 3 ZONEN H04 0121  
       Revision: D0000000    Serial number: 01240220140349
       Coding: 642462C000
       Shop #: WSC 06325 000 00000
       VCID: 392FD131795FF74FCD7-806C
    
    3 Faults Found:
    00713 - Centre Left Vent Positioning Motor (V110) 
                002 - Lower Limit Exceeded - Intermittent
                 Freeze Frame:
                        Fault Status: 00100010
                        Fault Priority: 3
                        Fault Frequency: 2
                        Reset counter: 79
                        Mileage: 49867 km
                        Time Indication: 0
                        Date: 2019.07.26
                        Time: 19:21:46
    
                 Freeze Frame:
                        Voltage: 14.50 V
                        Temperature: 19.0C
                        Temperature: 8.0C
                        Count: 10000
                        Count: 9789
                        Bin. Bits: 01000000
                        Bin. Bits: 00000001
                        Time: 255.00 s
    
    03220 - Stop Valve for Coolant for Climatronic (N422) 
                009 - Open or Short to Ground - Intermittent
                 Freeze Frame:
                        Fault Status: 00101001
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 101
                        Mileage: 50371 km
                        Time Indication: 0
                        Date: 2019.08.09
                        Time: 21:42:51
    
    03220 - Stop Valve for Coolant for Climatronic (N422) 
                006 - Short to Plus - Intermittent
                 Freeze Frame:
                        Fault Status: 00100110
                        Fault Priority: 3
                        Fault Frequency: 1
                        Reset counter: 103
                        Mileage: 50394 km
                        Time Indication: 0
                        Date: 2019.08.16
                        Time: 17:51:04
    
                 Freeze Frame:
                        Voltage: 13.50 V
                        Voltage: 7.60 V
                        Voltage: 0.30 V
                        Voltage: 0.20 V
                        Bin. Bits: 00000000
                        Time: 78.00 s
                        Speed: 35.0 km/h
                        Count: 4
    
    
    -------------------------------------------------------------------------------
    Now for the second part of my question. I looked into the plenum chamber for the valve and noticed the following part code (4H0 121 671D). Based on my google search, this part seems to relate to the N82 rather than the N422 (even though the VCDS error highlight N422). Are they the same and has anyone dropped in the 4H0 121 671D to fix a faulty N422?

    Thanks in advance!
    Last edited by Uwe; 08-19-2019 at 09:24 AM. Reason: CODE tags

  2. #2
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    N422 and N82 seem to reference the same valve: "Certain vehicles without an auxiliary heater (optional equipment) were fitted with vacuum-actuated coolant shut-off valves from the start of production onwards (depending on engine). At a later date, shut-off valves with direct electric activation were gradually introduced. Depending on the engine version and the production period, these valves may be designated Climatronic coolant shut-off valve - N422- or coolant shut-off valve - N82-."

    4H0121671D looks like the part one would expect to find in 2014 A4 as N422/N82. So my guess would be that it's indeed the right choice as replacement.

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