c5 2009 AC doesnt cool
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Thread: c5 2009 AC doesnt cool

  1. #1
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    Default c5 2009 AC doesnt cool

    hellow

    all of a sudden today my wife complained the the AC stopped cooling and the radio display stopped working

    AC light on, air is blowing out but not cold
    radio diaplay doesnt show

    dont know ehat is the connection if any at all between the two

    any advise about diagnosing the AC problem?

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    thanks a million

  2. #2
    UFO
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    It is likely that your AC condensor in front of the radiator has developed pin hole leaks. My C5 did and it required the condensor to be replaced and system re-gassed. Has worked perfectly ever since.

    No advice re the radio but it may be worth checking fuses inside the car and under the bonnet for both matters first.
    Craig K
    2009 C5 HDi Exclusive

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    Fellow Frogger! BallinaOB's Avatar
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    My 2008 C5 started to not cool as efficiently as it should in early 2015. Had it checked by an aircon specialist, system was all fine but the gas was down by 35%. After a regas it was working at 100% again.
    Anthony O'Brien
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    Contented Peugeot Driver addo's Avatar
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    Can you feel the compressor "click" with your fingertips when the engine is running and someone pushes the AC switch off then on?

    Is the low pressure line cold or icy?

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    Agree with UFO re the A/C as it may have a pinhole leak and gas pressure is now too low for the A/C to switch on.

    The display screen in earlier X7 models can go dark in hot weather and that was covered on this site by RobL last year. Not sure if that's what you mean by radio display not working??? If it has navigation, it would be a different display unit and they were known to suffer various faults, sometimes simply cured by a (non-trivial) software upgrade.

    Test the battery and charging as it may be weak and there is some kind of feature downgrade going on. Strange things are always a good hint to test your battery, especially when over 3 years old.

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    Temperatures in the low '30s in a C5 without working AC could be trying! I hope it's fixed soon.

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    Can I check the condenser? AC guy checked and said the gas pressure is OK.

    Any other ideas???? Please?

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    Contented Peugeot Driver addo's Avatar
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    Did he say if the compressor is engaging correctly?

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    One mechanic didn't didn't find the problem. The other said need to fix the compressor.

    I think I'll rake it to the center garage

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    Contented Peugeot Driver addo's Avatar
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    There are not many possible causes. A little disciplined thinking will take you through the fault diagnosis.

    1. Are the low pressure pipes cold or icy? If they are, it is a heater box problem (blend motor)
    2. If they are not cold, is the compressor clicking on? If it is not, then it may either have inadequate gas pressure or a fault with the BSI.
    3. If you jump the compressor so it runs, do the low pressure pipes get cold and the AC feel like it's working? This means a BSI fault.
    shanadoo likes this.

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    1000+ Posts Ken W's Avatar
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    A Lexia/Diagbox will give you all the temperatures at various parts of the aircon system and help diagnose the problem. Also if the pollen filter blocks so there is little airflow through it, that can stop the coolth getting through.

    Cheers, Ken

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    Thank you all.
    How do I locate the low pressure pipes?

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    Contented Peugeot Driver addo's Avatar
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    See the pipes going to/from the compressor?

    The fat pipes are low pressure ("low side") and the skinny ones are high pressure ("high side").

    This is how the AC works, the high pressure gas is allowed to seep through a small passage (called a TX valve or orifice tube depending on the installation) and expand greatly on the far side of this restriction. As it expands, it absorbs heat - this creates your cooling effect.

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    Quote Originally Posted by addo View Post
    See the pipes going to/from the compressor?

    The fat pipes are low pressure ("low side") and the skinny ones are high pressure ("high side").

    This is how the AC works, the high pressure gas is allowed to seep through a small passage (called a TX valve or orifice tube depending on the installation) and expand greatly on the far side of this restriction. As it expands, it absorbs heat - this creates your cooling effect.

    thank you for your reply!!!

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    Contented Peugeot Driver addo's Avatar
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    !אין בעיה

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    UFO
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    I forgot to add that prior to finding the leaking condensor I did have the system topped up by a local AC guy. The top up lasted only a few weeks before the pressure had dropped enough that it was obvious something really was wrong. Once the condensor was changed and the system re-gassed there have been no further issues. I think that was ~four years ago.
    Craig K
    2009 C5 HDi Exclusive

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    The pipes are both hot. Seems that the compressor does kick in.

    Compressor fault?

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    1000+ Posts Ken W's Avatar
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    Sounds like it I am afraid. If you get a Citroen part number, you might be able to source a replacement from Europe for about $400.

    Cheers, Ken

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    1000+ Posts Ken W's Avatar
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    Sounds like it I am afraid. If you get a Citroen part number, you might be able to source a replacement from Europe for about $400.

    Cheers, Ken

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    Quote Originally Posted by mudale mudale View Post
    The pipes are both hot. Seems that the compressor does kick in.

    Compressor fault?
    I'd suggest you get a aircon technician to put some gauges on the system. At the moment you are just taking guesses.

    Best to have the system diagnosed and have the fault located.

    If both pipes are "hot" and the compressor clutch pulls in, you could have a restriction in the system.
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  21. #21
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    I agree - seek professional advice rather than chase your tail and deplete your bank account.
    Craig K
    2009 C5 HDi Exclusive

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    Contented Peugeot Driver addo's Avatar
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    The electrovalve fitted on the back of many such compressors is apparently a failure risk. You would think, though, that they would fail to fully working.

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    you guys were right
    an update:
    the clutch was faulty.
    replaced the clutch and pully and everything is OK
    i was wrong telling you that the compressor kicked in (strange, because the RPM did changed while turning onqoff the AC)

    thank you all guys for the support and expirienced help
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  24. #24
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    Good result! Cheaper than a new compressor too.
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