Rs2 Vag-Com fault codes AC (need some help)

[quattrojan]

My AC aint working, the ac compressor and all was changed at the stealership 3 months before i bought the car, but the ac doesnt "kick in" when the ac light is on.

So i got these fault codes from vag-com

Any idea?

Address 08: Auto HVAC Labels: None
Part No: 8A0 820 043 F
Component: Klima-Vollautomat D51
Coding: 00050
Shop #: WSC 07234

3 Faults Found:
01271 - Positioning Motor for Temperature Flap (V68)
41-10 - Blocked or No Voltage - Intermittent
01272 - Positioning Motor for Central Flap (V70)
41-10 - Blocked or No Voltage - Intermittent
01274 - Air Flow Flap Positioning Motor (V71)
41-10 - Blocked or No Voltage - Intermittent

[S2central.net]

Check fuses 4, 12 and 14 first of all...

Its weird to get faults on those three motors all at once - the only common link would be a wiring problem...

With reference to this diagram - http://www.s2central.net/S2_Schematics/B/B75.PDF - maybe the D or B connector block into the rear of climate unit.

Also check that earth connections are good too.

Do these faults all come back after they are cleared with VAGCOM - maybe they are old alarms stored and not yet reset.

It may just be you have a leak in your system which prevents it from working.

[johne]

The most obvious reason for the compressor not to kick in because you're out of refrigerant gas.

If you don't have access to an A/C pressure gauge then you can check the low pressure switch. Unfortunately it is in a difficult position up against the passenger bulkhead behind the engine ECU. If you remove the engine ECU you can reach up and feel it.

If there's gas in the system the switch contact will be made. If the switch is open circuit, you've lost your gas.

Alternatively assuming you've checked fuse S17, pull the magnetic clutch relay, J44 and see if you've got +12volts on pin 2/30 when the ignition is switched on. No 12 volts, low pressure switch is open circuit = no gas.

John