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Thread: Air Con Issue

  1. #1
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    Air Con Issue

    The Air con on my car is a bit intermittent. When it's at idle there is hot air coming into the cabin, if I drive the car then it feels cooler but not as cold as it should be. I have established the fan for the AC/Radiator at the front is not turning when the A/C is on. The fan does come on however when the engine temp is around 90 degrees. Below is a breakdown on what's been done so far.

    1) The A/C compressor turns on when I turn on the A/C and off when I turn the A/C off
    2) The refrigerant has been removed and topped up to the correct pressure and no leaks have been detected
    3) Using a diagnostic machine the garage has forced the fan to come on using the ECU and the fan is functioning correctly and as expected.
    4) With the diagnostic machine the Evaporator sensor was showing 0 degrees, I have since replaced the evaporator sensor but this has made no difference. I don't have a diagnostic machine to hand to reported back what the reading is now since the sensor has been changed.
    5) There are no DTC codes when it was connected to the diagnostic machine

    From what I'm gathering from the above it seems the fan is not kicking in when the A/C is turned on however I'm at a bit of a loss on where to go with this now and would really appreciate any help or troubleshooting I can try.

    Thanks

  2. #2
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    Quote Originally Posted by ritz55 View Post
    The Air con on my car is a bit intermittent. When it's at idle there is hot air coming into the cabin, if I drive the car then it feels cooler but not as cold as it should be. I have established the fan for the AC/Radiator at the front is not turning when the A/C is on. The fan does come on however when the engine temp is around 90 degrees. Below is a breakdown on what's been done so far.

    1) The A/C compressor turns on when I turn on the A/C and off when I turn the A/C off
    2) The refrigerant has been removed and topped up to the correct pressure and no leaks have been detected
    3) Using a diagnostic machine the garage has forced the fan to come on using the ECU and the fan is functioning correctly and as expected.
    4) With the diagnostic machine the Evaporator sensor was showing 0 degrees, I have since replaced the evaporator sensor but this has made no difference. I don't have a diagnostic machine to hand to reported back what the reading is now since the sensor has been changed.
    5) There are no DTC codes when it was connected to the diagnostic machine

    From what I'm gathering from the above it seems the fan is not kicking in when the A/C is turned on however I'm at a bit of a loss on where to go with this now and would really appreciate any help or troubleshooting I can try.

    Thanks
    Hi, I had this recently, see attached.

    I had two independent companies have a look at it and they couldn't sort it so I took it to Jag, which cost £980 for a new fan

    Same symptoms as you had hot at slow speeds, slightly cooler at motorway speeds
    Attached Thumbnails Attached Thumbnails IMG_0219.jpg   IMG_0220.jpg   IMG_0221.jpg  

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    Quote Originally Posted by Sheps31 View Post
    Hi, I had this recently, see attached.

    I had two independent companies have a look at it and they couldn't sort it so I took it to Jag, which cost £980 for a new fan

    Same symptoms as you had hot at slow speeds, slightly cooler at motorway speeds

    Yes the fan has to be on full time when the compressor is activated for it to work properly.
    May be a daft question but Isn't the AC/CC fan switch, independent of the fan itself? ..this being the case it seems mad that you've had to replace the entire unit!
    Jaguar XFR 2011

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    Quote Originally Posted by Sheps31 View Post
    Hi, I had this recently, see attached.

    I had two independent companies have a look at it and they couldn't sort it so I took it to Jag, which cost £980 for a new fan

    Same symptoms as you had hot at slow speeds, slightly cooler at motorway speeds
    Hiya Sheps31, just a quick question so before the fan unit was replaced am I right in saying that the fan was not working at all even when forced by the Jaguar diagnostic machine?

    In my case using a diagnostic machine I'm able to force the fan to start but with just the A/C on the fan normally doesn't turn at all or at very low speeds once the engine gets hot.

    BTW thanks for your help.

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    So a quick update. I have spoken to a Jaguar Tech yesterday evening and he said the issue I'm describing sounds like one of 2 things.

    The first being the PCM module and the second as OBC john mentioned the DPS (direct pressure sensing) valve. However he also mentioned that if it was the DPS valve then this would give a error code in the climate control module (he knew the code from the top of his head) which my car isn't giving so has eliminated that as the issue. To be sure with any issue however they would need to do a full diagnostic which could add up to around 8 hours of labour and at £150 + VAT per hour seems a crazy amount of money to be spending.

    Any other suggestions would be appreciated.

    Thanks

  6. #6
    Senior Member Phil F's Avatar
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    Yes forget jaguar and go to a decent Air Con specialist . As them if they are familiar with the jaguar and if they BS you go somewhere else . There are loads of decent AC specialist who can sort your car at a fraction of Jaguar prices .
    The secret of flight is to aim at the ground and miss !

    2013 Sportbrake 2.2 Sport. Italian Racing Red

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    Quote Originally Posted by ritz55 View Post
    So a quick update. I have spoken to a Jaguar Tech yesterday evening and he said the issue I'm describing sounds like one of 2 things.

    The first being the PCM module and the second as OBC john mentioned the DPS (direct pressure sensing) valve. However he also mentioned that if it was the DPS valve then this would give a error code in the climate control module (he knew the code from the top of his head) which my car isn't giving so has eliminated that as the issue. To be sure with any issue however they would need to do a full diagnostic which could add up to around 8 hours of labour and at £150 + VAT per hour seems a crazy amount of money to be spending.

    Any other suggestions would be appreciated.

    Thanks
    To date I've had the condenser replaced due to leak even after that the cooling was either not coming on or shutting down at various points. had it re-gassed a few times but i'd tend to get bad regulation, cold blasts etc but it seemed to work generally ok.
    We found a fault code relating to a pressure valve so replaced the DPS(known tech bulletin issue) @ £300 ish
    Even now its not 100% imo.
    It cools fine generally and has survived the summer so far although on 2 occasions on those very hot days i.e 34C+ we've had It took 5 ish minutes before any cooling kicked in...then it ran with no problems, still getting those uneven cold blasts and then a taper off...not sure if this is expected behavior or not.

    Cant say i'm overly impressed with this system at all, I've heard of so many problems I've lost count.
    Jaguar XFR 2011

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