Hi,

I’ve recently got a second hand A1 2012 S-Line 3dr.

I took it to Halfords and they have advised I have a blocked Air con.

I’ve just replaced the the air filter and cabin filter as they were past due.

Does anyone know if I can unblock the A/C myself and if so how to do it and what I’m looking for.

Many thanks in advance

The cooling system of AC does not block up. It commonly loses its gas through leaks, or the compressor can fail, or the belt can snap.

Perhaps it is an air duct that has been blocked by a failed flap motor. Please give some symptoms of the problem.

1 hour ago, cliffcoggin said:

The cooling system of AC does not block up. It commonly loses its gas through leaks, or the compressor can fail, or the belt can snap.

Perhaps it is an air duct that has been blocked by a failed flap motor. Please give some symptoms of the problem.

The A/c has stopped working. If it’s a hot day it just blows warm air regardless if it is set on cold.

19 minutes ago, Zacy2566 said:

The A/c has stopped working. If it’s a hot day it just blows warm air regardless if it is set on cold.

Hi I would get someone else to check if the system has any gas in it, most independent garages have a decent aircon machine and will check it by seeing if it has ay gas and then pressure checking the system for leaks chances are its either run low on gas or has a hole in the radiator either way Cliff was correct when he said they can't block, therefore I would give the ZOONS at Halfords a wide birth.

Steve.

2 hours ago, Zacy2566 said:

The A/c has stopped working.

That's not a symptom; that's supposition.

2 hours ago, Zacy2566 said:

If it’s a hot day it just blows warm air regardless if it is set on cold.

Is it the same temperature from every vent, or just one? What happens when the temperature setting is raised to hot.

I have had the system run on VCDS and this was the output:

Address 08: Auto HVAC Labels: None

Control Module Part Number: 8X0 820 043 B HW: 8X0 820 043 B

Component and/or Version: Klima 1 Zone H12 0070

Software Coding: 3420080040

Work Shop Code: WSC 00046 790 00000

ASAM Dataset: EV_AirCondiFrontAU210 006035 (AU21)

ROD: EV_AirCondiFrontAU210_006.rod

VCID: 3365AACB9A3561070E-8066

7 Faults Found:

0005 - Motor for Central Flap

B11AB 07 [00001000] - Mechanical Failure

Intermittent - Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Priority: 3

Fault Frequency: 2

Reset counter: 105

Mileage: 156728 km

Date: 2024.10.12

Time: 09:15:09

Voltage terminal 30: 14.2 V

Inside temperature: 12.2 C

Outside temperature: 12.0 C

Central air flap motor: actual value-Data: 0.0 %

Central air flap motor: spec. value-Data: 48.6 %

0008 - Position Sensor for Motor for Central Flap

B11AC 15 [00001000] - Open or Short to Plus

Intermittent - Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Priority: 3

Fault Frequency: 2

Reset counter: 103

Mileage: 156728 km

Date: 2024.10.12

Time: 09:14:18

Voltage terminal 30: 14.1 V

Central air flap motor: actual value-Data: 0.0 %

Central air flap motor: spec. value-Data: 100.0 %

Supply voltage for external components: 5.0 V

0040 - Function Restriction due to Faults in Other Modules

U1113 00 [00001000] - -

[New feature! Extended UDS fault detail is only supported by current gen. interfaces]

Intermittent - Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Priority: 6

Fault Frequency: 2

Reset counter: 112

Mileage: 157141 km

Date: 2025.02.07

Time: 22:04:42

Voltage terminal 30: 10.5 V

Outside temperature: 7.5 C

Inside temperature: 13.2 C

0051 - High Pressure Sensor

B10AE 84 [00001000] - Signal Below Allowable Range

Intermittent - Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Priority: 2

Fault Frequency: 11

Reset counter: 40

Mileage: 156591 km

Date: 2024.09.18

Time: 15:29:10

Coolant temperature: 52.50 C

Inside temperature: 41.6 C

Coolant fan activation: specified value: 0.0 %

Engine speed: 0.00 /min

Refrigerant pressure: 1.0 bar

Compressor current: actual value: 0 mA

Outside temperature: 24.0 C

0060 - Engine Off Timer Performance

P150A 00 [00001000] - -

Intermittent - Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Priority: 7

Fault Frequency: 3

Reset counter: 114

Mileage: 157141 km

Date: 2025.02.10

Time: 00:08:19

Voltage terminal 30: 11.7 V

Terminal 15 status: On

0071 - Running-in regulation

B10C6 54 [00001001] - Missing Calibration / Basic Setting

Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Priority: 3

Fault Frequency: 1

Reset counter: 88

Mileage: 158535 km

Date: 2026.06.17

Time: 09:27:06

0143 - Rerigerant Pressure Sensor

B1282 14 [00001001] - Open or Short to Ground

Confirmed - Tested Since Memory Clear

Freeze Frame:

Fault Priority: 2

Fault Frequency: 12

Reset counter: 76

Mileage: 156591 km

Date: 2024.09.18

Time: 15:29:08

Coolant temperature: 52.50 C

Inside temperature: 41.6 C

Coolant fan activation: specified value: 0.0 %

Engine speed: 0.00 /min

Refrigerant pressure: 1.0 bar

Compressor current: actual value: 0 mA

Outside temperature: 24.0 C