HVAC AC Failure on 2007 2.2CDTI

Discussion in '3rd Generation (2006-2012)' started by Graphnic, Thursday 5th Jul, 2018.

  1. Graphnic Club Member ★ ☆ ☆ ☆ ☆

    Nick Warwickshire
    35
    7
    Hi Folks,
    My A/C has just failed and no longer pushes out cold air. It didn't appear to be a gradual failure either. Switching it on and off appears to cause the usual audible change in pitch due to the additional engine load, so something is happening... just nothing cold!

    I see there is a known issue on the petrol version, but cannot see mention of the CDTI. Any advice before I take it somewhere for diagnostics?

    Thank you:Smile:
     
  2. Wizard Senior Member ★ ★ ☆ ☆ ☆

    United Kingdom Andy Surrey
    185
    66
    It could simply be it needs regassing.
     
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  3. Sandy52 Senior Member ★ ★ ☆ ☆ ☆

    United Kingdom Sandy NORWICH
    188
    96
    It is easy to check if your pollen filter is clear, and not blocked. That can affect flow, but if it is not pumping out cold air it may need regassing.
     
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  4. Patc50 Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Pat Nantwich
    36
    21
    A couple of years ago my A/C was not working - no cold air. Luckily an air con specialist lives close by and he checked it for me ..... it was a simple faulty relay. He replaced the relay (£25 I recall) and it's been fine ever since. May be worth a look.

    Cheers
     
  5. Wizard Senior Member ★ ★ ☆ ☆ ☆

    United Kingdom Andy Surrey
    185
    66
    Annoyingly, my air conditioning has started to play up.

    Works perfectly, but then stops blowing cold.

    Turn off climate control, then back on and ok again for a bit!

    Anyone had similar symptoms?

    If gas low I would have thought it would just stop working and turning & off wouldn’t start it working again.

    Any ideas?
     
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  6. Accord_N22 Club Veteran ★ ★ ★ ★ ★

    1,755
    561
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    If its a sudden failure, I would definitely check the AC relay as mentioned.

    When you switch the air con on, does the clutch on the compressor engage?
     
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  7. Wizard Senior Member ★ ★ ☆ ☆ ☆

    United Kingdom Andy Surrey
    185
    66
    Next time it stops working I will check.

    I have a friendly garage I do work for who I’m hoping will recharge my AC to see if problem goes away.
     
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  8. Wizard Senior Member ★ ★ ☆ ☆ ☆

    United Kingdom Andy Surrey
    185
    66
    It has been good as gold since it played up.

    So highly unlikely to be lack of gas.

    Where is this £25 relay? Is it the one at the bulkhead end of the fuse box under the bonnet? The lid shows a symbol that looks like it is referring to AC.
     
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  9. Patc50 Club Member ★ ☆ ☆ ☆ ☆

    United Kingdom Pat Nantwich
    36
    21
    I recall that the relay is to the right of the engine (as you look with bonnet up), in a fuse box near the bulkhead ... but can't say exactly which one it is. Not sure if that's much help!
     
  10. Wizard Senior Member ★ ★ ☆ ☆ ☆

    United Kingdom Andy Surrey
    185
    66
    That sounds like the one, thank you
     
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  11. Domm Club Member ★ ☆ ☆ ☆ ☆

    It is really inefficient buying parts (even such as relay) without primary testing. Just get it to a decent A/C technician, it will narrow down the likely cause and you will spend money where it is really needed :Smile: & one more important thing - there is no such thing as "regas", its not a fuel, if the system lacks refrigerant it has a leak somewhere.
     
  12. Wizard Senior Member ★ ★ ☆ ☆ ☆

    United Kingdom Andy Surrey
    185
    66
    I understand about not swapping parts without having checked with a specialist.

    But I disagree on the gas. All AC systems lose gas over time and it recommended that the AC is regassed around every 2 years (ish). Also a regas includes oil that lubricates the system.

    If it loses gas shortly after being filled, then yes, you have a leak.
     
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  13. Ivan D C New Member Getting Started

    United Kingdom Ivan D C Sherborne
    1
    I had exactly the same on my 2008 2.2 CDTi, intermittent Aircon. Change that relay, £25 at dealer or half that on eBay. If you take it out there will be a part number on it, type it into eBay search to find one. For £12 worth doing that before paying anything to a garage who may string the job out!
    - - - Updated - - -
    Actually supposedly genuine ones on eBay are only £5 to £10
     
  14. Wizard Senior Member ★ ★ ☆ ☆ ☆

    United Kingdom Andy Surrey
    185
    66
    At that price I think it’s worth doing.

    Thank you
     
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  15. Wizard Senior Member ★ ★ ☆ ☆ ☆

    United Kingdom Andy Surrey
    185
    66
    £4.24 inc postage on eBay.

    There are plenty for sale on eBay and also on Amazon. In my experience, if a part is easily available it tends to mean they are problematic, so I’m hopeful this will fix my problem. And at this price I will give it a go.

    Thanks for help.
     
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  16. Wizard Senior Member ★ ★ ☆ ☆ ☆

    United Kingdom Andy Surrey
    185
    66
    New relay arrived and fitted easily. Looks original.

    Out of interest I cut the top of the old relay to see if it was in good shape, it wasn’t :Smile:

    Rusty dust was inside, not a good sign. Also signs of moisture damage. Strange, as there is not any other signs of moisture in the fuse box!

    The contacts were not in great shape either. So I’m pretty confident this was the fault, or at least a fault to occur in near future.
     
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    andy83 likes this.