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  1. #1
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    non-condensable test from the low pressure side



    Hi
    Old vehicles have air conditioning at R12 and some of these cars have only one low-pressure service port. If it is necessary to perform a test of non-condensables, can we do it from the LP side ?



  2. #2
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    Re: non-condensable test from the low pressure side

    .

    No

    R12 is banned so you need to remove the remaining charge
    and then if you test it with nitrogen (OFN) vac it out you can
    put another replacement refrigerant in.

    Rob

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  3. #3
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    Re: non-condensable test from the low pressure side

    I know that. Of course these are running with new refrigerant. the subject is not about gas but the fact that there is only one low-pressure port. It does not answer my question.

  4. #4
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    Re: non-condensable test from the low pressure side

    Ok fit one?

  5. #5
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    Re: non-condensable test from the low pressure side

    .

    A system as small as a car, van, truck or other AC is so small the amount of refrigerant is measured in grammes and if non-condensables are in, how did they get in?

    When was purging a system acceptable? Not since the 80's or 90's.

    Vac the system from the low side and weigh in new, purging is bad practice.

    Rob

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  6. #6
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    Re: non-condensable test from the low pressure side

    I've never known the older stuff not to have h p and l.p. they tend to have several various ports and even sight glass as these had standard threads some had a smaller thread on h p like most of the jap and French stuff
    to be fair I don't really understand the question to test for non condensables on a Vechicle is normally not required
    What Vechicle is it please

  7. #7
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    Re: non-condensable test from the low pressure side

    A few cars from Renault have only one low-pressure service port. Even those who have R134a

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    Re: non-condensable test from the low pressure side

    Yes but not pre 1993
    Only the later ones have a hp port on the l p line ie megane or scenic
    some Volvo has 1 port as well
    every Renault pre 93 car ie on 12 has two ports plus like the 18 and the 9 even the fuego has two just a bitch to find what Renault is it

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    Re: non-condensable test from the low pressure side

    today I plugged the manifold on the lp. it reads 88 psi 82 F. It's the same outside temperature. Can I deduce there are no non-condendables ?

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    Re: non-condensable test from the low pressure side

    Is it r12 thats in the system,i will look at my old comparitor charts if i can find them

  11. #11
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    Re: non-condensable test from the low pressure side

    No R134a. sorry for the mistake.

  12. #12
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    Re: non-condensable test from the low pressure side

    Recover the charge,vac the system and rechsrge with virgin refrigerant thats my advice

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    Re: non-condensable test from the low pressure side

    No that’s fine if anything pressure is a little low

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    Re: non-condensable test from the low pressure side

    I really do not know what the symtoms of thd original post were,was there a problem with the system?

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    Re: non-condensable test from the low pressure side

    the owner tells me there were non-condensables

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    Re: non-condensable test from the low pressure side

    .

    Where did the non condensable come from?
    It doesn't just appear! It was either sucked in through
    a leak or it was put in by a person

    If a leak that needs dealing with correctly.

    Rob

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  17. #17
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    Re: non-condensable test from the low pressure side

    I think he tries to recharge by himself.

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    Re: non-condensable test from the low pressure side

    .

    Fair enough

    If he is a friend or family member then I'd
    help him out and do the job properly for him
    but if he is a paying customer, just smile advise
    him what he needs to do and then stand back.

    These jobs can never pay because there is more
    work than they are prepared to pay for and the
    simple fact that he has attempted to do this himself
    shows what value he puts on it.



    Rob

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  19. #19
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    Re: non-condensable test from the low pressure side

    Very true Rob,I have been asked many times to quote "gas up"" car a/c by people I warn them that it must have a leak if the gas is gone and make them aware of the cost to find it straightaway many choose to wind the windows down for two weeks of the year lol

  20. #20
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    Re: non-condensable test from the low pressure side

    Ah yes we had one of these in our workshop
    took1.7 kilos out of a 220 Merc up tested fixed leak up test overnight all good vac and gassed it engineer backed it out but when he hit the brakes it sounded like carnage from the boot had a quick look and there was13 disspossable recharge containers !!!

  21. #21
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    Re: non-condensable test from the low pressure side

    Car a/c personally could not be bothered with it,ok some make money out of it but i find it to be a pain would rather work on a larger system nickles and dimes

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    Re: non-condensable test from the low pressure side

    Quote Originally Posted by pvl View Post
    Hi
    Old vehicles have air conditioning at R12 and some of these cars have only one low-pressure service port. If it is necessary to perform a test of non-condensables, can we do it from the LP side ?
    Yes you can. Just put car in stabile enviroment to stabilise tempetatures and measure gas presure and ambient temperature. On your manometer saturation temperature must be equal to ambient temperature.

  23. #23
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    Re: non-condensable test from the low pressure side

    Just take the charge out,then recharge it with 134a change the oil charge in compressor vac it job done

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