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Heating suddenly blowing cold?

Discussion in 'A4/S4 forum(B5 Chassis)' started by jonnycraig, Feb 26, 2011.

  1. jonnycraig
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    jonnycraig Member

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    [Feb 26, 2011]
    Hi guys a quick one hopefully!

    turned the temp down (digital climate) yesterday in traffic to 21'C after car warmed up (heating working) car cooled down as expected, now if I put the temp up again even up to 'Hi' it still blows cold.

    Is there a fuse for the actuator that moves from hot/cold or is something else. Engine temp is fine so I hopefully I can rule out the thermostat.

    Any ideas?

    Thanks and a lil chilly!!

    J
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  3. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Feb 26, 2011]
    i had the opposite problem, it was permenantly hot unless you set it to "LO", was the temperature flap motor that had failed.

    If you enable climate diagnostics (recirc + up) then choose channel "32c" using temp +/- then press recirc again, it will show you if the temperature flap is generating any errors. If its good it should just show 0 or some small number. if its bad it will climb up. Mine was climbing so fast it was getting to 255 and wrapping back to zero, and the display just appeared to be flashing up random numbers!
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  4. jonnycraig
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    jonnycraig Member

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    [Feb 26, 2011]
    Ill give it a go now and see what it says..... hopefully it'll be normal :/

    Thanks
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  5. jonnycraig
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    jonnycraig Member

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    [Feb 26, 2011]
    Sitting at '0' solid not moving, the manual flap selectors for screen/centre and feet all work properly too... whats next, matrix blocked?
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  6. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Feb 26, 2011]
    Try channel 1 and see if theres a fault code?
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  7. jonnycraig
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    jonnycraig Member

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    [Feb 27, 2011]
    Heating has decided to start working again .. bizarre!

    Codes came back as follows: 183, 221, 53, 87

    Looked them up, but not sure if I found the correct definitions
    Link: Audi Online Technical Library - Diagnostic Trouble Codes (DTC) Tables

    183
    Fuel temperature sender-G81 Interruption/Short to B+

    221
    Throttle Pos. Sensor -B- Circuit Range/Performance

    53 & 87 I cant find
    #6

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