2003 E46 316i air conditioning not working

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  1. 2003 E46 316i air conditioning not working
    #1
    BMW Master
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    negev's Car Details
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    E46 330i
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    Hello,

    I have a 2003 E46 316i with 126k miles and the air con doesn't blow cold at all. I've just had it re-gassed by a local specialist and they said it's not leaking, after the re-gas it holds the pressure but when I turn on the AC the compressor doesn't fire up, so it's now booked in for diagnostics.

    I opened the fusebox and checked all the fuses related to the AC but they're all good, is there anything else relatively straighforward that I can test myself to save on labour costs at the garage?

    Many thanks,
    neg

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  3. #2
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    755munich's Car Details
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    Does the clutch (attached to the front of the pulley on the compressor) turn freely by hand?

    Check with the engine off for obvious reasons!

  4. #3
    BMW Master
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    negev's Car Details
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    I will try to check tonight, can you tell me where it is under the hood and what it looks like? I haven't a clue

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  6. #4
    BMW Master
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    negev's Car Details
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    Also if it does or doesn't move freely what does that mean?

  7. #5
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    The compressor is like this-the clutch is the bit on the end next to the pulley wheel & nearest the camera.

    When the engine is running (a/c off) the belt will be turning the pulley but the clutch will be stationary. With the a/c on the clutch should engage & start spinning as well provided it has sufficient gas. (It cuts in & out so won't be turning continuously even when everything is working correctly).

    If the clutch is stiff or impossible to turn by hand it may have seized. There may however be a small amount of resistance although you should be able to overcome this easily.
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  8. #6
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    Where is the compressor under the bonnet? I opened it up last night and had a look but I couldn't see anything resembling one.. is it hidden away somewhere?

  9. #7
    BMW Master
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    I'm not at all familiar with the E46 but with some Googling it seems it's bolted to the lower left-hand side of the engine (i.e passenger side).
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    If the compressor checks out ok ,check the pressure switch ,if this is faulty the compressor wont cut in !

    Mark

  11. #9
    BMW Master
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    what does the pressure switch look like and how can i test it?

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