W210 climate issue?

[andy27168]

Hi,
As you have the digital display you should be able to access everything you need to diagnose the fault, the refrigerant gas pressure etc, a close inspection with a bright inspection lamp of all the visible pipework especially in the area around the condensor should reveal any leaks.
Diagnosis and fault codes are listed below, i lifted the info from a post on another forum, I hope it assists you in your problems.

SELF-DIAGNOSTICS
DIAGNOSTIC TROUBLE CODE READOUT
Entering Diagnostic Trouble Code (DTC) Display Mode
1) Turn ignition on. Press down arrow push button until "LO" is shown in A/C-heater control panel temperature display window.
2) Within 20 seconds, simultaneously press REST and defrost push buttons for more than 2 seconds. The Light Emitting Diode (LED) in the recirculated air push button will blink and the display window will show "di R".3) Press AUTO push button repeatedly, recording each DTC,until all DTCs are displayed. Permanent malfunctions are displayed first. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION tables.
4) If no permanent malfunctions are stored, the display window shows "En d". Press AUTO push button again. Intermittent DTCs will be displayed. Intermittent malfunctions are recognizable by the degree (°) symbol displayed along with the DTC (example: "04 °").
5) If no intermittent malfunctions are stored, the display window shows "En° d". Proceed to ERASING DIAGNOSTIC TROUBLE CODES.

Erasing Diagnostic Trouble Codes
1) After display window shows "En° d", press AUTO push button once again. Display window should show "dE L" (delete).
2) To erase DTCs, simultaneously press down and up arrow push buttons for more than 5 seconds. The display window should show "- --". If not erasing DTCs, press the AUTO push button. The permanent DTCs will again be displayed. Proceed to EXITING DTC DISPLAY MODE.
Exiting DTC Display Mode
Simultaneously press down and up arrow push buttons until the pre-selected temperature setting of "72 °F" is displayed. Turn ignition off.
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION TABLE
----------------------------------------------------------------------
Code(s) (1) Cause
01 ......................Normal
02 ......................A/C-Heater Control Panel
03 & 04 ..............In-Car Temp. Sensor/Blower Short Circuit
05 & 06 ..............In-Car Temp. Sensor/Blower Short/Open Circuit
07 & 08 ..............Outside Temp. Sensor Short Circuit
09 & 10 ..............Outside Temp. Sensor Short/Open Circuit
11 & 12 ..............Heater Core Temp. Sensor Short Circuit
13 & 14 ..............Heater Core Temp. Sensor Short/Open Circuit
19 & 20 ..............Evaporator Temp. Sensor Short Circuit
21 & 22 ..............Evaporator Temp. Sensor Short/Open Circuit
23 & 24 ..............Engine Coolant Temp. Sensor Short Circuit
25 & 26 ............. Engine Coolant Temp. Sensor Short/Open Circuit
27 & 28 ..............Refrigerant Pressure Sensor Short Circuit
29 & 30 ............. Refrigerant Pressure Sensor Short/Open Circuit
31 ......................A/C Compressor RPM Sensor Circuit
32 ......................Drive Belt Slip Recognition Circuit
47 & 48 ...............Auxiliary Coolant Pump Short Circuit
49 & 50 ...............Auxiliary Coolant Pump Short/Open Circuit
51 & 52 ...............Duovalve Short/Open Circuit
53 & 54 ...............Duovalve Short/Open Circuit
59 & 60 ...............A/C Compressor Clutch Circuit
61 & 62 ...............A/C Compressor Clutch Short/Open Circuit
63 & 64 ...............(2) Auxiliary Fan Activation Short Circuit
65 & 66 ...............(2) Auxiliary Fan Activation Short/Open Circuit
67 & 68 ...............(3) Auxiliary Fan Activation Short Circuit
69 & 70 ...............(3) Auxiliary Fan Activation Short/Open Circuit
(1) - Other than codes 01 and 02, the even numbered codes indicate an intermittent malfunction.
(2) - Auxiliary (condenser) fan stage 1 (low speed).
(3) - Auxiliary (condenser) fan stage 2 (high speed).
----------------------------------------------------------------------
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION TABLE
----------------------------------------------------------------------
Code(s) (1) Cause
71 & 72 ....Closed Throttle Speed Increase Short/Open Circuit
73 & 74 ....Closed Throttle Speed Increase Short Circuit
75 & 76 ....Diverter Flap Switchover Valve
77 & 78 ....Diverter Flap Switchover Valve Short/Open Circuit
79 & 80 ....Tempering Flap Switchover Valve
81 & 82 ....Tempering Flap Switchover Valve Short/Open Circuit
83 & 84 ....(2) Fresh/Recirculated Air Flap Switchover Valve
85 & 86 ....(2) Fresh/Recirculated Air Flap Switchover Valve Short/Open Circuit
87 & 88 ....(3) Fresh/Recirculated Air Flap Switchover Valve
89 & 90 ....(3) Fresh/Recirculated Air Flap Switchover Valve Short/Open Circuit
91 & 92 ....(2) Defroster Flap Switchover Valve
93 & 94 ....(2) Defroster Flap Switchover Valve Short/Open Circuit
95 & 96 ....(3) Defroster Flap Switchover Valve
97 & 98 ....(3) Defroster Flap Switchover Valve Short/Open Circuit
99 & 100 ...(2) Footwell Flap Switchover Valve
101 & 102 ..(2) Footwell Flap Switchover Valve Short/Open Circuit
103 & 104 ..(3) Footwell Flap Switchover Valve
105 & 106 ..(3) Footwell Flap Switchover Valve Short/Open Circuit

(1) - Even numbered codes indicate an intermittent malfunction.
(2) - Long (80 percent movement) stroke.
(3) - Short (20 percent movement) stroke.
----------------------------------------------------------------------

READING SENSOR VALUES
1) Turn ignition on. Simultaneously press down and up arrow push buttons until the pre-selected temperature setting of "72 °F" is displayed. Press the AUTO push button.
2) Press REST push button for more than 6 seconds. The display window will alternately show "01" and an in-car temperature of "72 °F", or "LO" if there is an open circuit, or "HI" if there is a short circuit.
3) By pressing the windshield air distribution push button, the next ascending test step is displayed. By pressing the footwell air distribution push button, the next descending test step is displayed. See SENSOR VALUE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table. Press REST push button to exit reading sensor values mode.

SENSOR VALUE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
------------------------------------------------------------
Code Cause/Value
01 ............................. In-Car Temperature Sensor
02 ............................ Outside Temperature Sensor
03 ........................ Heater Core Temperature Sensor
05 .................... Evaporator Core Temperature Sensor
06 ................. (1) Engine Coolant Temperature Sensor
07 .............................. (2) Refrigerant Pressure
08 ............................ (3) Blower Control Voltage
09 .......... Software Status Of A/C-Heater Control Module
15 ........................... Selected In-Car Temperature
20 ................................. Software Version Code
21 ...................................... (4) Engine Speed
22 .............................. (5) A/C Compressor Speed
23 ......................................... Vehicle Speed
50 ................................ 80.° - 00.° (Not Used)
51 ......... Number Of Actual Drive Belt Slip Recognitions
52 ......... Number Of Actual Drive Belt Slip Recognitions
(1) - A display of "12.°5" corresponds to 125 Celsius (257°F).
(2) - Refrigerant pressure is displayed in bar. One bar equals 14.5037 psi. A display of "12.°8" corresponds to 12.8 bar (185.6 psi).
(3) - A display of "16.°5" corresponds to 1.65 volts.
(4) - A display of "06.°0" to "70.°0" corresponds to 600 RPM to 7000 RPM respectively.
(5) - A display of "00.°0" to "84.°0" corresponds to 0 RPM to 8400 RPM respectively.

 

[BlackC55]

Nice one Andy. Forgot about that!!

 

[andy27168]

Though you can display all the values and codes it will still need interpretating, thats where the skill and understanding of how the system works comes in.
though I feel sure any codes and/or values could be interpreted by the many knowlegeable members the forum has, if the O/P has any problems.

 

[davidjpowell]

Tracked down these codes and have run on my car.

B1226 - In-car temperature sensor (B10/4)
B1227 - Outside temperature indicator temperature sensor (B14)
B1228 - Heater core temperature (B10/1)
B1229 - Heater core temperature (B10/1)
B1230 - Evaporator temperature sensor (B10/6)
B1231 - ECT sensor (B11/4)
B1232 - Refrigerant pressure sensor (B12)
B1233 - Refrigerant temperature sensor (B12/1)
B1234 - Sun sensor (B32)
B1235 - Emissions sensor (B31)
B1241 - Refrigerant fill
B1416 - Coolant circulation pump (M13)
B1417 - Duovalve (Y21y1), left
B1418 - Duovalve (Y21y2), right
B1419 - Electromagnetic clutch (A9k1)
B1420 - Idle speed increase
B1421 - Pulse module (N65)
B1422 - Series interface (K1) connection to instrument cluster (A1)
B1423 - Switchover valve block (Y11)
B1424 - Activated charcoal filter actuator (A32m2) open
B1425 - Activated charcoal filter actuator (A32m2) closed
B1432 - Non-USA DTC
B1459 - Series interface (K2) connection to instrument cluster (A1)
B1462 - Wide open throttle (WOT) position signal: diesel engines

Mine is showing:

E61 - 227
E61 - 231
E61 - 234
E61 - 416
E61 - 459
E61 - 241

Deleted them and nothing has come back. Still the same though. EC light on, unless I press demist.

The other test produced the following.

1 12
2 07
3 24
4 24
5 08
6 32
7 02
8 08
9 05
10 1.0
11 1.5
12 4.3
20 00
21 00
22 00
23 00
24 11.5
40 74
41 33
42 12
43 136

Not quite sure what they all mean!

 

[BlackC55]

Refrigerant pressure and evap temp are the important ones.

The evap temp should be 6or7

The refrigerant pressure should be 10-12 bar at full yield.

 

[renault12ts]

Tracked down these codes and have run on my car.

B1226 - In-car temperature sensor (B10/4)
B1227 - Outside temperature indicator temperature sensor (B14)
B1228 - Heater core temperature (B10/1)
B1229 - Heater core temperature (B10/1)
B1230 - Evaporator temperature sensor (B10/6)
B1231 - ECT sensor (B11/4)
B1232 - Refrigerant pressure sensor (B12)
B1233 - Refrigerant temperature sensor (B12/1)
B1234 - Sun sensor (B32)
B1235 - Emissions sensor (B31)
B1241 - Refrigerant fill
B1416 - Coolant circulation pump (M13)
B1417 - Duovalve (Y21y1), left
B1418 - Duovalve (Y21y2), right
B1419 - Electromagnetic clutch (A9k1)
B1420 - Idle speed increase
B1421 - Pulse module (N65)
B1422 - Series interface (K1) connection to instrument cluster (A1)
B1423 - Switchover valve block (Y11)
B1424 - Activated charcoal filter actuator (A32m2) open
B1425 - Activated charcoal filter actuator (A32m2) closed
B1432 - Non-USA DTC
B1459 - Series interface (K2) connection to instrument cluster (A1)
B1462 - Wide open throttle (WOT) position signal: diesel engines

Mine is showing:

E61 - 227
E61 - 231
E61 - 234
E61 - 416
E61 - 459
E61 - 241

Deleted them and nothing has come back. Still the same though. EC light on, unless I press demist.

The other test produced the following.

1 12
2 07
3 24
4 24
5 08
6 32
7 02
8 08
9 05
10 1.0
11 1.5
12 4.3
20 00
21 00
22 00
23 00
24 11.5
40 74
41 33
42 12
43 136

Not quite sure what they all mean!

I think yours is showing EB1 - 227 etc, not E61 - 227...in this case Outside temp indicator.

 

[davidjpowell]

I'm disregarding the errors as they are not reshowing after the delete. My suspicion is that at least some of then are related to the system shutting down.


The pressure I think is No. 7 at 02. Looks like a leak then.

 

[davidjpowell]

Mystified. AC started working last night.

Will monitor and get the codes read as and when unless it packs up again.

 

[Dieselman]

Mystified. AC started working last night.

Will monitor and get the codes read as and when unless it packs up again.

It knows you need it now the warm weather is here.

 

[davidjpowell]

its not so much the warm weather, but that I want it to be working come the warm weather.

 

[BlackC55]

The compressor won't run if the evap temp sensor is faulty. They can be intermittent too.