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Air con diagnosis V12

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  • Air Con Compressor Engaged

    Air Con Compressor Engaged

    This is what an air con compressor on a V12 should look like when the air con is switched on. It should cycle between this and the off state ~30 seconds once the cabin is at the correct temperature.

  • Air Con Compressor Disengaged

    Air Con Compressor Disengaged

    This is what an air con compressor on a V12 should look like when the air con is swithced off. It will also switch to this state every ~30 seconds once the cabin has reached the correct temperature. The compressor should also default to this state if the gas level is low.

  • R12 Valve

    R12 Valve

    This is what the original valves look like on the XJS. Note they are smaller than the R134 valves.

  • R12 Valve Cap

    R12 Valve Cap

    This is the standard R12 valve cap on a V12. Note how it is smaller than the R134 equivalent.

  • R134 Valve

    R134 Valve

    An R134 valve fitted to a V12. It is larger than the standard R12 valve.

  • R134 Valve Cap

    R134 Valve Cap

    The cap for an R134 valve on a V12. Note how it is larger and (usually) colour coded red and blue unlike the (usually) black R12 caps.

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    R12 Valve
    R12 Valve Cap