2000 E46 328I Air-con not working

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  1. 2000 E46 328I Air-con not working 
    #1
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    jon kirby's Car Details
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    Only had the car 6 months so never needed the aircon until now. The temp on sunday was a dizzy 16 degrees and was quite stuffy in the car so i gave the aircon a whirl. I adjusted the central warm/cold dial to cold, reduced the temp display to 18 degrees and pushed the aircon button, now the air was cool but not aircon ice cool. What i did notice was that once the aircon was activated the revs never rose slightly and i never heard a relay click, althou i was driving so outside noise may have been an influence.

    Would my first port of call be to check the relay clicks on and off? how prone are the pumps to failure (98k) on the clock

    Cheers

    Jon
     
     

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    with the engine running and temp turned down have a look at the air con pump and then have someone turn the air con on, the pump should click in and the centre start turning. if it doesnt then get the system recharged/leak tested.
     
     

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    Another tip (BMW will even tell you this)

    Leave the air conditioning on all the time. Even if you have it set to heat, leave the air conditioning button turned on.

    Apparently it is much better for the system to do this, as it keeps everything nicely lubricated within the aircon system and stops it loosing gas. Apparently better for the condenser too.

    I've left my air con turned on for the last 6 months or so and its not really made any major difference to fuel economy, it also de-mists the windows a million times quicker as it cools the air before heating it therefore taking out any moisture before blowing it into cabin.

    Regarding the revs when you turn it on, you proably wont be able to notice. I know the only sign that its on in my car is the light thats lit up on the button for it.

    Try getting it re-gassed, if it hasnt been used for so long its probs lost a lot of it
     
     

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    Have looked at the pump with the engine running, the pulley spins but the central part doesn't, which indicates the clutch isn't engaging, there is no click from the relay behind the glove either and no rise in revs.

    Is there some sort of safety device/feature which stops the pump running/engaging if the system is low on gas?
     
     

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    bump? anyone?
     
     

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    Correct, if the gas pressure is too low then the compressor won't engage.
     
     

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    If you do have it re-gassed, there is a flourescent die that can be added. If there is a leak in the system somwhere it is much easier to locate as there will be a green residue left behind at the point of failure. Had a similar problem on a previous car, turned out to be a stone hitting the condensor radiator and puncturing it.
     
     

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    Just a quick update, the condenser fan doesn't run either, is this also to do with the fact the compressor isn't running? and that maybe the system is low on pressure?
     
     

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    I've found this with mine... so MAYBEEEE you guys have the same thing?

    If the temp outside is ABOVE about 10/11c and I set the climate control to its coldest the air con comes blasting out. If the temp outside is BELOW 10/11c the air con doesnt come on, it just blows the cold air from directly outside. Maybe thats why you air con isnt coming on? If its not warm enough outside?
     
     

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    yeah tried with the outside temp beenaround 17/18 degress
     
     

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