Question about 2000 Jaguar S-Type

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No cold air from 2000 s type - 2000 Jaguar S-Type

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Have the A/C system checked or serviced ...

Does the compressor turn on when the A/C or windscreen defroster is actuated?

Posted on Sep 28, 2010

  • 3 more comments 
  • sgreen04 Oct 06, 2010

    something turns on, it feeds air fast but it,s not cold, the a/c gas has been checked. I get the imression most Jag S Type faults are electrics

  • ZappaNut
    ZappaNut Oct 06, 2010

    I agree that most automotive problems that are not mechanical failures are electrics..

    There are a whole bunch of possabilities to the cause of your problem ...

    Let me explain what the workings are of the A/C system on your car , and maybe you will beable to infer which portion of the system is malfunctioning.

    You turn the climate controle in the car to either Windscreen defrost... or Internal temp down (colder)... which actuates the A/C system ;

    ( I am going to stick with the electronics of it , as the mechanicals seem to be functioning fine for you)

    An electronic signal is sent to a PCM via the climate control switch to turn on the A/C.
    The PCM checks the signal that the A/C line holds enough pressure to properly function via a pressure sensor , which is inline with another sensor which reads the ambient air tempreture...
    If the signal is within an acceptable range , the Relay will be sent a signal to turn on the Compressor thru a fuseable supply .
    Depending on the Ambient tempreture and line pressure reading being sensed by the PCM the radiator and A/C Condensor fans will be turned on thru a fusable supply wire.
    If all is functioning corectly , you will feel cooled air enter the vehicle cabin.. which is dehumidified so it will defrost the windscreen quicker.

    If you are experiencing non-cooled air movement , and suspect it could be something else... I would suggest that the temp control switch is malfunctioning.

  • sgreen04 Oct 06, 2010

    thanks my little j princess (no offence) will try and work that one out bit by bit

  • ZappaNut
    ZappaNut Oct 06, 2010

    Right on !!
    If you could leave a little testimonial ... I would appreciate it alot !!

    ( LMAO at the J-princess reference)

  • sgreen04 Oct 07, 2010

    Zappanut has given me a lot to think and work on to a very tricky and potentially expensive problem, more than I have from any other site or my local garage, regards


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