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AC Gone pop?

Discussion in 'A4/S4 forum(B5 Chassis)' started by ScottD3, Aug 9, 2012.

  1. ScottD3
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    ScottD3 I want your faulty electronics

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    [Aug 9, 2012]
    For the last couple of days I've had the smell of AC oil in my cabin on start up but still pumping out cold air, I was waiting for it to go pop and it went to day.
    I just had to go when its pushing 30 degrees and sunny.

    Now all I'm getting is hot air and no oil smell.

    I replaced the compressor and dryer unit bout a year ago.
    The Compressor was 2nd hand so it could be that but I'm trying to work out what could have gone pop to cause the Oil smell to leak in to the cabin and then pump out hot air.

    I stripped the heater unit out at Easter to replace the heater matrix.

    I'm about to pop out to check pipes and connections.

    Any one got any ideas?
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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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    [Aug 9, 2012]
    Not sure how you could get AC oil in the cabin. If the evaporator was leaking it'd dump refrigerant into the cabin as well, and if it did that you'd know about it!

    I'm gettin a man out tomorrow morning to regas the AC on the avant, to hopefully make it work properly again.

    The first thing they do is a leak check, so maybe it'd be worthwhile for you to do the same.
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  4. ScottD3
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    ScottD3 I want your faulty electronics

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    [Aug 9, 2012]
    That's my thinking.

    But the evaporator is the only unit that passes in to the cabin and could leak oil. Like you said, if it was leaking I'd notice the gas as well as the oil and the noise of gas leaking.

    Unless the pipes as some how came loose?

    Also, why would it just be pumping out hot air and not cold air?
    Then again, that could be because of the current out side temperature and not cooling the air down enough.

    ahhhhhhhhhhhhhhhhh
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  5. ScottD3
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    ScottD3 I want your faulty electronics

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    [Aug 10, 2012]
    I've set my self up for it being the evap, if its any thing else then happy days.
    If it is the evap I got to strip the bloody dash out again.
    Twice in 1 year. damn it!!
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  6. ScottD3
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    ScottD3 I want your faulty electronics

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    [Aug 17, 2012]
    Went to the AC people on Monday, got it re-gassed and tested.
    All seemed fine for a day and then it stopped again.

    Went back to the AC guy today to look for some AC dye to help us find the leak.

    Found a section of green dye around the drain hole in the transmission tunnel.
    It appears to be the evaporator at fault.
    Not news that I wanted at all.
    Another job that requires the dash to come out and a bit of coolant draining. :(

    Any one ever replaced a evaporator on their B5?
    I've done the heater matrix but not this.
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