2005 Megane Airconditioning issue
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  1. #1
    Tadpole
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    Default 2005 Megane Airconditioning issue

    Hi all,

    The air conditioning on my 2005 Megane Dynamique X84 (105000 km) cycles on and off (clicking noise) when at low revs usually just after start. I initially thought it needed a re-gas which I did do, but cycling still happens. The Air con guy who did the re-gas could not identify the problem. My mechanic (not a Renault specialist) could not identify problem either without pulling the system apart. He suggested taking the car back to Renault and have them check the idle setting and air conditioning computer etc. The system blows cold and works fine when revs are higher than about 900rpm.

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    Has any one had a similar issue and had it fixed?

    Regards,

    Jeremy S

  2. #2
    1000+ Posts robmac's Avatar
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    Default

    Quote Originally Posted by Bullfrog View Post
    Hi all,

    The air conditioning on my 2005 Megane Dynamique X84 (105000 km) cycles on and off (clicking noise) when at low revs usually just after start. I initially thought it needed a re-gas which I did do, but cycling still happens. The Air con guy who did the re-gas could not identify the problem. My mechanic (not a Renault specialist) could not identify problem either without pulling the system apart. He suggested taking the car back to Renault and have them check the idle setting and air conditioning computer etc. The system blows cold and works fine when revs are higher than about 900rpm.

    Has any one had a similar issue and had it fixed?

    Regards,

    Jeremy S

    I've seen similar conditions but on different cars.

    Certain Nippon Denso systems have this "fast clutch cycling behavior" and it's normal operation, but not usually at low compressor revs.

    Presumably, in your vehicle, it's a changed behavior and previously the system has been running with normal cycling. At this stage I'm assuming the clicking is either the relay inside the car or compressor clutch.

    I'd take a guess that hi side pressure is getting too high and the high pressure safety switch is terminating the compressor cycle. Elevated high side pressure can be caused by many things , excessive refrigerant charge, blocked air flow through condenser coil, to a crimped aluminium line. You could check the condenser fan/s are running

    It's also possible the variable delivery compressor is playing up, ie "pumping too hard" at too low revs.


    As to "pulling the system apart" , take that with a grain of salt, all aircon diagnosis since time immemorial has been done with a running system, with the system apart there are no pressures/ temperatures to check which is the basis of fault finding. Pull it apart after the fault is known, in replacement mode is the go.

    It sounds to me like you need to find a competent auto air conditioning technician to check the system out in a logical sequence. I wouldn't necessarily assume a dealer is competent either.

    Best of luck, unfortunately remote diagnosis is impossible.


    You could clarify what where the ticking noise is if it's not the clutch/ relay.
    Last edited by robmac; 16th December 2015 at 05:28 PM.

  3. #3
    Tadpole
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    Default

    Thanks for info. I will get it checked out by competant a/c outfit as suggested armed with this info. Thanks again.

    JS

  4. #4
    Contented Peugeot Driver addo's Avatar
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    Being that it's a variable displacement Nippondenso compressor, I wondered if the variator is kaput.

    http://adair.com.au/tsb/TSB%2053%20H...0DIAGNOSIS.pdf

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