Aircon Moisture

Discussion in 'Engine' started by Danny DeVito, Jun 7, 2011.

  1. Danny DeVito

    Danny DeVito Hardcore MB Enthusiast

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    Today i found a broken pipe in my aircon. Wis tells ..make sure pipes etc are plugged to avoid moisture. Obviously my pipe is broken for who knows how long so my question today......

    What do i do? I will hopefully buy a new pipe and a refill kit but what about the moisture etc ? Or should i save up and have it professionally refilled ?
     
  2. whitenemesis

    whitenemesis MB Club Veteran

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    Get it professionally recharged. It needs to be evacuated, dried and charged along with the correct dose of lubricant
     
  3. OP
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    Danny DeVito

    Danny DeVito Hardcore MB Enthusiast

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    Would you class MB as professionally recharged as they are half as close to me. Although and indie may travel from Dublin but cost less
     
  4. whitenemesis

    whitenemesis MB Club Veteran

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    If the dealer offers a/c recharge then, yes!
     
  5. OP
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    Danny DeVito

    Danny DeVito Hardcore MB Enthusiast

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    I have a concern that the dealers may not know how to evacuate (whats this ?) and dry ...
    recharge is 70 euro they said
     
  6. Ted

    Ted MB Club Veteran

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    vaccing out will boil off all of the moisture, but I would expect you to need a new receiver/drier.
     
  7. OP
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    Danny DeVito

    Danny DeVito Hardcore MB Enthusiast

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    Why a new drier ? Sounds like this will have to wait as it goes far beyond the 70€ refill i had in mind...;o(
     
  8. Ted

    Ted MB Club Veteran

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    Don't know if things are different these days, but when I were a lad, the receiver/drier had silica gel (Ithink) in it to absorb any moisture. Once this had been exposed to 'the atmosphere' as in a big leak, the silica would absorb a large amount of the moisture, and would have then 'done it's job' and required a new one.

    Normal maintenance/vaccing down etc doesn't cause moisture to get in.
     
  9. scillyisles

    scillyisles Hardcore MB Enthusiast

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    Yes this appears to be correct. The drier unit normally contains a bag of silica dessicant in it.
     
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  10. OP
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    Danny DeVito

    Danny DeVito Hardcore MB Enthusiast

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    Why doesn't the silica be knackered at first installation then ?
     
  11. Ted

    Ted MB Club Veteran

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    It has caps/seals. These are removed at installation time. There is not enough time during installation/vac down/recharge to saturate the gel. This only happens over a period of time.

    I have oftem wondered if you put the receiver/drier in a warm oven for a while if it would dry it out.

    Anyway, that is what I was taught - any major/invasive surgery on a vehicle (SD1/XJ) aircon - new receiver/drier.
     
  12. OP
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    Danny DeVito

    Danny DeVito Hardcore MB Enthusiast

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    How is the vacc done ?
     
  13. OP
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    Danny DeVito

    Danny DeVito Hardcore MB Enthusiast

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    Which bit is the receiver/dryer ? And is it possible to have aluminium pipe repaired ?
     
  14. aircondoc

    aircondoc Hardcore MB Enthusiast

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    You'll almost certainly need a new pipe. I used to go to Autoair of Gloucester for receiver/driers when I did this for money. Much cheaper than a dealer. Possibly the pipe too, although I no longer have their catalogues.

    Auto Air Glos

    I always found them most helpful.
     
  15. OP
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    Danny DeVito

    Danny DeVito Hardcore MB Enthusiast

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    Sadly the broken pipe is on the side of the condenser in front of the radiator. The pipe has broken on the bend before it heads down to the condenser. It looks like someone tightened the fitting and put pressure on it. Then over time it broke. Which bit is the receiver/ drier ? And are they expensive ? I think if the radiator people can repair rads then surely they can repair a bit of aluminium pipe ? Or what about metal putty ? will that keep air con gas in ??
     
  16. Steven Stoole

    Steven Stoole Hardcore MB Enthusiast

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    The problem with aluminum is when you weld it it becomes brittle in that area. Also the pipe is quite thin and when they weld they use a lot of DC to do this. Also with the putty to keep that gas in without getting a leak will not be easy. If it was a copper condenser you could most probably repair it but being aluminum they are made to be replaced when they break. Don't want to sound negative but you would be better off buying a new unit. This will save you time and money in the long run. Hope this helps
    Steve
     
  17. Ted

    Ted MB Club Veteran

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    I would expect the receiver/drier to be adjacent to, or mounted on the condenser. They usually have a sight glass to see the refrigerant.
    I wouldn't expect this to be an expensive component - and I will bet that you can get a decent quality unit from a 'proper' aircon repair place.
     

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