-
‒ Measure the temperature of the air flowing from the "centre" dash panel vents, e.g. with a Minitester V.A.G 1362.
-
‒ → Compare measured values with values in the diagram.
Notes:
-
◆ It is recommended that two independent thermometers are used for this measurement.
-
◆ If the required values are not attained => Page 87-123 (determine fault if specified value not attained).
-
◆ During self-diagnosis, with an operating and display unit -E87 with Part No. 8D0 820 043 from index "D", the air conditioner control is no longer switched off.
-
◆ The air temperature in the air conditioner's mixing chambers (downstream of heat exchanger) can be measured in the measured value block with V.A.G 1551 during the refrigeration capacity test =>display group 014, Page 01-128.
-
◆ The function of the air conditioner may be recognised, for example, from the fact that the refrigerant pipe at the low-pressure end (thick pipe) cools down.
-
◆ From Model Year 1997, the air conditioner pressure switch -F129 (=> Page 01-106.
Fault determination in the event of deviation from specified value
|
▪ Was the compressor switched off during the refrigeration capacity test?
|
|
↓
yes
↓
|
↓
no
↓
|
|
- Continue with test => Page 87-124
|
- Use hose clamps 3093 or 3094 to pinch off the two coolant hoses from the engine to the heater's heat exchanger.
↓
|
|
|
- Repeat the refrigeration capacity test .
↓
|
|
|
▪ Is the required refrigeration capacity attained?
|
|
|
↓
yes
↓
|
↓
no
↓
|
|
|
- Detach the hose clamps 3093 or 3094 on both coolant hoses.
↓
|
- Send the vehicle to an VW/Audi air-conditioning service centre (fault in refrigerant circuit).
|
|
|
- Check the actuation of the temperature flap positioning motor -V68, perform final control diagnosis=> Page 01-55.
|
|
|
Continuation of test - compressor was deactivated during the refrigeration capacity test
|
|
- Interrogate fault memory => Page 01-110.
Repeat the refrigeration capacity test.
|
|
▪ Is the required refrigeration capacity attained (compressor was not switched off)?
|
|
↓
yes
↓
|
↓
no
↓
|
↓
no
↓
|
|
End
|
- Vehicles in which the control was not deactivated during the self-diagnosis:
|
- Vehicles in which the control was deactivated during the self-diagnosis:
|
|
|
↓
Continued t
|
↓
Continued t
|
1) Control deactivated during self-diagnosis.
2) Control not deactivated during self-diagnosis.
|
|
↓
In display zone 1, read the code for the compressor shutoff criterion according to which the compressor was shut off.
|
↓
Press the Q key on the V.A.G 1551 immediately the compressor is deactivated (the air conditioner control is deactivated and the compressor shutoff criterion stored).
|
|
|
|
- Read measured value block, display group 001 => Page 01-82
|
|
|
↓
Code 1
↓
|
↓
Code 3
↓
|
↓
Other code
↓
|
|
|
▪ High-pressure switch -F118/-F23 or pressure switch -F129 open
|
▪ Low-pressure switch -F73 open or pressure switch -F129 open
|
▪ =>from Page 01-110
|
|
|
↓
|
↓
|
|
|
|
- Continue the test
|
- Continue with test
|
|
|
|
|---|
|
Continuation of test - compressor shutoff criterion code "1"
|
|
▪ Was the radiator fan -V7 switched to speed 2 during the test?
|
|
↓
yes
↓
|
↓
no
↓
|
|
- Renew the high-pressure switch -F118/-F23 or the pressure switch -F129.
Repeat the refrigeration capacity test.
↓
|
- Jumper contacts "1" and "2" in the detached connector of the high pressure switch -F118/-F23 => Page 87-21
↓
|
|
▪ Is the required refrigeration capacity attained (compressor was not switched off)?
|
▪ Is the radiator fan running at speed 2?
|
|
↓
yes
↓
|
↓
no
↓
|
↓
yes
↓
|
↓
no
↓
|
|
End
|
- Re-install the old switch.
-F118/-F23 or -F129.
Send the vehicle to an VW/Audi air-conditioning service centre (fault in refrigerant circuit).
|
- Renew the high-pressure switch -F118/-F23 or the pressure switch -F129.
|
- Service the fan -V7 actuation according to the current flow diagram
Repeat the refrigeration capacity test
|
|
|
|---|
|
Continuation of test - compressor shutoff criterion code "3"
|
|
- Jumper the contacts in the detached connector of the low-pressure switch -F73 => Page 87-118
▪ Is the required refrigeration capacity attained?
|
|
↓
yes
↓
|
↓
no
↓
|
|
- Replace the switch -F73 or -F129.
|
▪ Was the compressor switched off again?
|
|
- Repeat the refrigeration capacity test.
|
↓
|
↓
|
|
↓
▪ Is the required refrigeration capacity attained?
|
yes
↓
|
no
↓
|
|
↓
↓
yes
↓
|
↓
↓
no
↓
|
- Check the wiring to the operating and display unit -E87 via the switch -F73/-F129.
|
- Send the vehicle to an VW/Audi air-conditioning service centre (fault in refrigerant circuit).
|
|
End
|
- Re-install the old switch -F73 or -F129
Send the vehicle to an VW/Audi air-conditioning service centre (fault in refrigerant circuit).
|
↓
Repeat the refrigeration capacity test.
|
|
|
