Hi, just wondering if any Air Con/ VCDS gurus on here can help. Car in question originally had non-working AC so a new compressor was fitted along with a re-gas. The high/ low pressure switch has also been changed. The AC now only works intermittently. When the car has been standing for a good few hours (i.e. overnight) it always kicks in immediately and works fine. However if you then leave the car parked for a short while (1 or 2 hours) and come back to it the AC will refuse to kick in.

 

I've as of this morning managed to get measuring block values for both scenarios, see below.

 

Not kicking in:

  0.0   Compressor Shut-Off Code

  800 /min   Engine Speed 

  0.0 km/h   Vehicle Speed 

  05:26   Standing Time 

  0.820 A   Compressor Current (actual)

  0.820 A   Compressor Current (specified)

  1000 /min   Compressor Rotations

  3.3 Nm   Compressor Load 

  8.0 bar   Coolant Pressure

  29.6 %   Radiator Fan Activation (actual)

  30.0 %   Radiator Fan Activation (spec.)

  OFF   Engine Speed (increase)

 

Working fine and blowing cool air:

  0.0   Compressor Shut-Off Code

  800 /min   Engine Speed 

  0.0 km/h   Vehicle Speed 

  04:00   Standing Time 

  0.730 A   Compressor Current (actual)

  0.730 A   Compressor Current (specified)

  1000 /min   Compressor Rotations

  4.6 Nm   Compressor Load 

  10.0 bar   Coolant Pressure

  35.6 %   Radiator Fan Activation (actual)

  36.8 %   Radiator Fan Activation (spec.)

  OFF   Engine Speed (increase)

 

Any advice would be appreciated as this seems to be quite a tricky problem to diagnose. Thanks 

couldn't you take it back to whoever fitted/regassed your aircon? surely if they have supplied a product that doesnt work they should be the ones investigating and fixing it

 

Andy

Already been back but they haven't been very helpful and don't seem to know what's wrong with it so a bit stuck now. 

 

Do the VCDS measuring blocks I posted up point to anything? Its the compressor load and coolant pressure which seem to differ the most but I don't fully understand what those values indicate.

Edited 20 July, 201411 yr by J400uk