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AirCon after 10 mins of engine running linked to fans not working?

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2006 2.0 tdi 140 Sport DSG 45k miles. (A red one as my mrs says)

I noticed Steve_Birdie posted a very similar topic recently so I thought I would add to the theme here rather than hijack his.  I have searched and found many posts regarding a/c but nothing that quite answers the question I have here?
 
Can somebody help, please?  

Apologies in advance for the looonnng post and the newbie inexperience etc…

I’ve had quite a few Skodas over the last 15 years, some serviced by main dealers, but mostly by local independents.  Occasionally it’s beyond them to diagnose the faults (not enough time or specialist equipment/knowledge I suppose).  All reasonably priced mind you.

Just recently I have noticed the a/c is not getting cold till the car engine is warm?  Hope it’s not connected to the telephone kit I had installed recently (it’s behind the a/c switch I think)?
 
I have noticed that the fans do not come on from a cold start, or whenever I press the a/c button for that matter (car has manual a/c only)?

So, I compared the Octy fans my mates Golf (same year and BKD engine etc.), his engine was warm at the time, pressed his a/c button and the fans started spinning straight away, also they went off immediately the a/c was switched off, em... sommerts wrong ere...?    His fans ran slow too, mine only run fast, and only once the engine is warm, they don't seem to come on in relation to the a/c button, but merely with increased engine temps, and never slowly? 

 

Upto this point my reading on here indicates that it’s the high pressure sensor, the fans, or the compressor itself?

The local Skoda dealer “serviced” the a/c a fortnight ago and initially found nothing wrong.  I explained (again) that it was taking 10 mins to go cold from a morning start, but it seemed fine during the day?  So, I left it with them overnight and they tried it from cold for themselves the following day.  Their diagnosis then went from “nothing wrong” to “you need a new compressor”, which at £800 is why I am looking elsewhere…
 
Just bought a VCDS today and managed to retrieve the following…  Obviously I’m no expert, but I can see the compressor is functioning, of a fashion anyway.  It seems to me as though the fans are not operating properly, either because the switch is faulty, the wiring is bad or the controller is bad?  I have checked all the fuses, they seem fine.
 
I was wondering if anybody in the Lancashire/Manchester area knows a good Skoda man, a/c or auto-electrical specialist they could recommend, or can throw any light on my findings with the VCDS lead, please keep in mind I’m not that mechanically minded myself?

________________________________________

Auto Scan output (all non-faults removed)
________________________________________
 

Monday,12,August,2013,11:38:55:55062
VCDS Version: Release 11.11.4
Data version: 20120807
Chassis Type: 1K0
Scan: 01 02 03 08 09 15 16 17 19 25 42 44 46 52 56 62 72

VIN: TMBCE21Z   Mileage: 73640km/45757miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000

Address 08: Auto HVAC        Labels: 1K0-820-047.lbl

 

   Part No: 1Z0 820 047 D
   Component: Climatic PQ35   010 0301
   Shop #: WSC 00000 000 00000
   VCID: 346CABBA57EC79B8F5D

1 Fault Found

00898 - Control Circuit A/C compressor

            010 - Open or Short to Plus - Intermittent

__________________________________________________________________________________________________

 

Then ran these tests as advised by others in their posts and got various results (ALL WITH A/C ON)
__________________________________________________________________________________________________
 

Ignition on but no engine running:

                                13:13:49

  5.0   Compressor Shut-Off Code
  0.000 A   Compressor Current (actual)
  0.000 A   Compressor Current (specified)
  17.0°C   Evaporator Temperature
  20.0°C   Interior Temperature
_____________________________________________
 
Engine running but Cold:
 
13:21:13
  0.0   Compressor Shut-Off Code
  0.810 A   Compressor Current (actual)
  0.820 A   Compressor Current (specified)
  1.2 Nm   Compressor Load
  4.2 bar   Coolant Pressure
  10.0 %   Radiator Fan Activation (actual)
  0.0 %   Radiator Fan Activation (spec.)
  18.0°C   Evaporator Temperature
  20.0°C   Interior Temperature
  14.30 V   System Voltage (Terminal 30)
_____________________________________________________________

Engine on and warm (car stopped but just been moving) Various
 
14:38:46

  0.0   Compressor Shut-Off Code
  800 /min   Engine Speed
  0.0 km/h   Vehicle Speed
  0.820 A   Compressor Current (actual)
  0.820 A   Compressor Current (specified)
  1000 /min   Compressor Speed
  7.4 bar   Coolant Pressure
  25.2 %   Radiator Fan Activation (actual)
  30.0 %   Radiator Fan Activation (spec.)
  8.0°C   Evaporator Temperature
  21.0°C   Interior Temperature

14:48:15

  0.0   Compressor Shut-Off Code
  800 /min   Engine Speed
  0.0 km/h   Vehicle Speed
  0.360 A   Compressor Current (actual)
  0.545 A   Compressor Current (specified)
  1000 /min   Compressor Speed
  2.3 Nm   Compressor Load
  14.4 %   Radiator Fan Activation (actual)
  0.0 %   Radiator Fan Activation (spec.)
  5.0°C   Evaporator Temperature
  20.0°C   Interior Temperature
_______________________________________________________________

Engine warm (but car stopped now for nearly a minute)

 

14:48:51

  0.0   Compressor Shut-Off Code
  800 /min   Engine Speed
  0.0 km/h   Vehicle Speed
  0.785 A   Compressor Current (actual)
  0.780 A   Compressor Current (specified)
  1000 /min   Compressor Speed
  2.6 Nm   Compressor Load
  7.0 bar   Coolant Pressure
  12.8 %   Radiator Fan Activation (actual)
  0.0 %   Radiator Fan Activation (spec.)
  11.0°C   Evaporator Temperature
  20.0°C   Interior Temperature
______________________________

Also had this from HVAC on another scan?  Might not be imprtant, everything except a/c OK?

Address 08: Auto HVAC
Cannot be reached

_______________________________

From a log I saved during a test drive it seems that it is only when the "Radiator Fan - Activation (actual)" goes over 25% that the "Radiator Fan - Activation (spec.)"
registers anything above 0%?  This seems to hold with the fact that the a/c does not blow cold until the main engine fan kicks-in, once the engine is warm? I have noticed
that the in the log that the evaporator temp seems to stay cold as long as the car is moving, hence you don't really notice the a/c going hot and then cold when driving normally.
However, if you stop for a while it does go a bit warmer unless the engine fan is running, which it will be if the engine is demanding it.  But, my fans don't seem to run in a slower mode (like my mates golf) as I said earlier, or when the a/c button is first pressed?

Is it the control panel on the dash, the wiring, the fans or the compressor (N280 valve or whatever it's called) at fault?  Any ideas anyone?

 

Any helpful tips would be much appreciated by this newbie. 

 

Thanks to all those who have posted stuff for others that I have read this week

OldJohn



 

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