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Thread: GTD dual zone clinate problem

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  1. GTD dual zone clinate problem 
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    Hi!

    One for the more obsessive ones here I'd imagine...

    Got a 2011 GTD and its having climate control issues. First I noticed was in recent hot weather the car isn't getting cool as you'd expect it to, although I've had a feeling it's not been great for a while. I have had the system regassed to no avail, but if you read on you'll see why.

    I have VCDS and have done a lot of logging to see what's going on. Temperature after evaporator quickly reaches around 2C when engine is started but vent temperatures are all over the place. I checked the other day with VCDS and with a cooking temperature probe and after a good 10 mins of driving with AC set to 'LO' on both sides, this is what I was getting from left to right:

    29C - 24C - 18C - 13C

    This was with external ambient temperature around 28C. First and last temps (left and right outer dash vents) agreed with VCDS and actual measurerment. These temps seem to transfer to footwell vents if I select that direction for ventilation.

    I have a Mk5 with dual zone climate and vent temps get to around 6C when on 'LO', so definitely not normal behaviour.

    I was on a long drive so turned the AC off for 15 mins or so and all four temperatures became largely equal at 29C ish, and temp after evaporator also rose to around 27C. This rapidly dropped to 2C when AC was put back on.

    No fault codes are logged, have performed a reset for flap positons and both left and right flaps have a range of approximately 30 to 225.

    Heating seems to work fine - if I put both sides to 'HI', hot air comes out of all vents at more or less equal temperatures around 60C.

    So what's going on? The fact that the evaporator cools to 2C and stays there tells me that the AC system is functioning correctly but there's something up with airflow which is stopping cool air getting to the vents.

    Compressor specified and actual current I noticed was low at around 0.450A, but then if there's not much airflow over the evaporator then the compressor will be running at low power so this makes sense.

    Thanks for your help!
     
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  2. Re: GTD dual zone clinate problem 
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    With the PQ35 platform (inc Golf 5 and 6) compressor failure is a very common problem and hard to diagnose without very specialised test equipment or a simple test of “no fault codes, good pressure, no chill” means new compressor.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
    !


     
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  3. Re: GTD dual zone clinate problem 
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    Quote Originally Posted by Crasher View Post
    With the PQ35 platform (inc Golf 5 and 6) compressor failure is a very common problem and hard to diagnose without very specialised test equipment or a simple test of “no fault codes, good pressure, no chill” means new compressor.
    Thanks for the reply, but I'm pretty sure there's no issue with the compressor/evaporato system - the evaporator temperature gets down to 2C quickly and stays there. The pipe in the engine bay coming off the compressor is freezing to touch.

    It seems like there's just no airflow going through the evaporator in the guts of the climate control system, like there's a flap somewhere that bypasses the evaporator so air is not being cooled.

    Cheers
     
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  4. Re: GTD dual zone clinate problem 
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    VCDS should show you if there is a flap problem.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
    !


     
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  5. Re: GTD dual zone clinate problem 
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    The flap motors all appear to be working correctly according to VCDS. No errors and I can see reasonable values for low/high end points and they all move between those points with no problems when I adjust temperature up and down.

    Question - does all air that passes through the blower/pollen filter go through the AC evaporator too? Are there any flaps before the evaporator that could be bypassing it partially?

    Thanks
     
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  6. Re: GTD dual zone clinate problem 
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    Assembly overview - heating and air conditioning unit, Climatronic, right-hand drive

    1 - Housing for air inlet with recirculation flap and back pressure flap
    2 - Servo Motor for fresh air, recirculation air, back pressure flap -V425-
    3 - Holder
    4 - Evaporator housing: upper part
    5 - Evaporator
    6 - Defrost flap servo motor -V107-
    7 - Servomotor of temperature flap right -V159-
    8 - Temperature sensor for evaporator -G308- or outflow temperature sensor for evaporator -G263-
    9 - Air distributor housing
    10 - Heating element for additional air heater -Z35- only installed in vehicles with diesel engines.
    11 - Heat exchanger
    12 - Heat exchanger casing
    13 - Cover for dust and pollen filters
    14 - Servomotor of the temperature flap on the left -V158-
    15 - Dust and pollen filters with activated carbon filter
    16 - Fresh air blower -V2- with control unit for fresh air blower -J126-
    17 - Cooling hose for glove compartment cooling
    18 - Connection piece for glove box cooling
    19 - Servo Motor for front air distribution flap -V426- with potentiometer for servo motor of front air distribution flap -G642-
    20 - Evaporator housing: lower part

    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
    !


     
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  7. Re: GTD dual zone clinate problem 
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    Thanks, that's really helpful. Looks like all air passes through the evaporator before getting to any flaps that could divert it so whatever the issue is it's beyond that. I think the place to look now is at the air distribution housing, but I have a feeling that's a huge job as I fear the whole dash will have to come out?

    It's been the first morning for a while that the car hasn't been sat in the sun when I got to it so I checked all temperature sensors I could find in VCDS and they were all within a degree or so of ambient so looking good there.

    With AC off and temp setting to 'LO', both sides were showing a degree or so above ambient during a drive, so the uneven temperatures are only happening when AC is on.

    Confused.
     
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  8. Re: GTD dual zone clinate problem 
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    Do you get the same roar of air flow when on full blow hot/cold on both cars (if I understood correctly that you're saying you have two)?

    On ours there's a distinct "baffle moving" sense as the AC is engaged (I think - I might have to play to check). Do you get that?

    Does putting it on recirc change things?

    See if you can find the SSP 318 (Self-Study Programme for VAG engineers) document - it has some info on the AC system which might help your fault finding.
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  9. Re: GTD dual zone clinate problem 
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    Quote Originally Posted by VAG-Abound View Post
    Do you get the same roar of air flow when on full blow hot/cold on both cars (if I understood correctly that you're saying you have two)?

    On ours there's a distinct "baffle moving" sense as the AC is engaged (I think - I might have to play to check). Do you get that?

    Does putting it on recirc change things?

    See if you can find the SSP 318 (Self-Study Programme for VAG engineers) document - it has some info on the AC system which might help your fault finding.
    I have a Mk5 and a Mk6. It's the Mk6 that has the issue. Airflow out of the vents or elsewhere doesn't seem nearly as powerful in the Mk6. I've swapped fans between them to eliminate that and no change. The fan sounds like it's going just as fast in the Mk6 but airflow is fairly weak.

    There is a change of noise when the AC engages. Looking at live data it appears to be the recirc flap moving. There is also a change of noise when going from 'LO' to 'HI'. It seems that this causes the main airflow to go from dash vents to footwell vents.

    If I put it on recirc the noise changes a bit but the airlfow doesn't. I've checked that the air intake is clear and it is. Same with cabin filter - brand new.

    All motors have been checked with VCDS and all move to their endpoints smoothly.

    I have started to dismantle things by taking the glove box out and one thing I've noticed is that the pipe that goes to the glove box which I believe should always be cold air, is at ambient.

    The thing that really confuses me is that with the left and right temps set to 'LO' and the AC off, both sides dash vents are near as dammit ambient temperature but when the AC is turned on, the left stays ambient and the right drops in temperature but still not as low as it should be. On the Mk5, both sides dash vents reach around 5C pretty quickly but I'm not getting below 10C. And all the time the evaporator temperature is around 2C.

    The lack of good airflow makes me think something is blocking the path of the air, but that still doesn't explain why one side gets cold and the other doesn't.

    It's almost like there's a big hole somewhere letting cold air out and sucking ambient air in.

    If I had the whole thing out on a bench I'm sure it would be obvious!
     
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