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  1. #11
    New Driver ilunn's Avatar
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    Quote Originally Posted by lizzard-t View Post
    Places like halfrawds and quackfit just re-charge the A/C system ,they don't recover old refrigerant they don't vacuum, they don't add oil or dye , so they cannot test for leaks .they just take a before and after temperature reading from your air vents , no change then no charge .
    Correct way should be
    Initial system test
    Check system components ( belts , condenser , compressor electrics )
    Check internal system components ( flaps heating etc )
    Recover exsisting refigerant
    Vacuum A/C system
    Re-gas
    Add oil and leak detection dye
    Leak test components
    Full post A/C test
    But I always thaught if you are F gas registered , you were supposed to carry out a full , before and after leak test .
    It's like me being a gas safe registered engineer , and not doing a tightness test , I would soon get , fined , and possibly inprisioned ..
    That's good point as to me if they are just squirting refrigerant in which is then leaking straight back out "its against law", its the same as just undoing a valve and letting it out into atmosphere but that's the cowboys that some places employ.

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  3. #12
    Learner Driver tens6's Avatar
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    Quote Originally Posted by lizzard-t View Post
    Places like halfrawds and quackfit just re-charge the A/C system ,they don't recover old refrigerant they don't vacuum, they don't add oil or dye , so they cannot test for leaks .they just take a before and after temperature reading from your air vents , no change then no charge .
    Correct way should be
    Initial system test
    Check system components ( belts , condenser , compressor electrics )
    Check internal system components ( flaps heating etc )
    Recover exsisting refigerant
    Vacuum A/C system
    Re-gas
    Add oil and leak detection dye
    Leak test components
    Full post A/C test
    But I always thaught if you are F gas registered , you were supposed to carry out a full , before and after leak test .
    It's like me being a gas safe registered engineer , and not doing a tightness test , I would soon get , fined , and possibly inprisioned ..
    I always have mine done at ATS, they seem to do all or most of the above. The reason it seems likely is that I was there a long while and they were constantly in and round the car. Mine turned out ok but the customer before me was told that they couldn't do his system as it didn't pass the initial pressure test, what needed repairing and he was only there for about 10 minutes.

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  5. #13
    Learner Driver Nick_H's Avatar
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    Vacuum tests will only show severe leaks - the main purpose of the vacuum section of a charge is to boil off any moisture within the system before the gas is re-added. The use of nitrogen is the most common form of testing the system as it places the whole A/C under the same pressure as when it is working. Pressure decay is monitored over time, and then very small leaks/loss of pressure can then be pinpointed using bubble spray.

    There is also newer tracer gas available which has a very small trace (5%) of hydrogen within it that can be detected with a 'sniffer', very sensitive for tiny leaks.

    Quite right loads of cowboys around that seem to just gas up and away it goes. Funnily enough no F-Gas cert is required for the new R1234YF gas.

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  7. #14
    Racing Driver

    sriray's Avatar
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    Quote Originally Posted by Nick_H View Post
    Quite right loads of cowboys around that seem to just gas up and away it goes.
    100% agree with you there

    OWNER OF 2012 INSIGNIA SRI NAV HATCHBACK 1.6T

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  9. #15
    Learner Driver astrachamp's Avatar
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    I’m in the trade (not car ac) and get scrutinised for every gram of refrigerant used and yet a chap from Halfords can just fire in a couple of hundred grams of 134a on the hope it’s not leaking. What a joke.

 

 
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