Golf Mk4
| Air conditioning and heating system - engine compartment |
Note| Parts marked with a “*” can be repaired only in workshops with suitable equipment and specially trained mechanics because the refrigerant must be evacuated beforehand using, for example, the air conditioning service station -VAS 6007A-. |
| 1 - | Damper with filling valve, low pressure side* |
| q | Releasing refrigerant into the environment is a punishable offence. |
| q | In refrigerant hose from expansion valve to air conditioner compressor. |
| q | Vehicles with engine code BDE, near expansion valve. |
| 2 - | Refrigerant hose* |
| q | From expansion valve to air conditioner compressor. |
| q | With damper. |
| 3 - | Refrigerant line* |
| q | From receiver with dryer bag to expansion valve. |
| 4 - | Evacuation and filling valve high pressure side* |
| q | Releasing refrigerant into the environment is a punishable offence. |
| 5 - | Air conditioning system pressure switch -F129- or high pressure sensor -G65- |
| q | Checking: vehicle diagnosis, testing and information system -VAS 5051B- in guided fault finding. |
| Removing and installing: |
| t | Torque setting 8 Nm |
| t | Replace O-ring seal (note part number) |
| Pressure switch and high pressure sensor can be removed without evacuating refrigerant circuit. |
| The high pressure sensor -G65- cannot be checked via Climatronic self-diagnosis. |
| q | Check air conditioning system pressure switch -F129- → Chapter. |
| q | Check high pressure sender -G65- → Chapter. |
| Function: |
| q | Switches radiator fan -V7- to next higher speed when pressure increases in refrigerant circuit. |
| q | Switches off the air conditioner when the pressure is high (for example, insufficient engine cooling). |
| q | Switches off the air conditioner when the pressure is too low (for example, loss of refrigerant). |
| q | The high pressure sensor -G65- supplies information to radiator fan control unit -J293- and engine control unit. |
| 6 - | Expansion valve* |
| 7 - | Dust and pollen filter |
| q | With activated charcoal filter. |
| q | Removing and installing → Chapter. |
| 8 - | Ambient temperature switch -F38- installed ► week 09.99, temperature sender for compressor switch-off -G346- installed week 10.99 ►. |
| q | Switches off air conditioning system magnetic coupling -N25- if the ambient temperature is too low (off at -1° C, on at 7° C). |
| 9 - | Air conditioning system shut-off thermal switch -F163- installed ► week 17.99 |
| q | Air conditioning system shut-off thermal switch -F163- switches off air conditioning system magnetic coupling -N25- when the coolant temperature is too high (off at 119°, on at 112°). |
| q | Removing and installing in vehicles with engine code AGZ → Chapter |
| q | Coolant temperature sender -G62- installed week 18.99 ►. |
| 10 - | Water drain valve |
| q | Checking → Chapter. |
| 11 - | Radiator fan control unit -J293- |
| 12 - | Refrigerant hose* |
| q | From expansion valve to air conditioner compressor. |
| q | With damper. |
| 13 - | Refrigerant hose* |
| q | From air conditioner compressor to condenser. |
| 14 - | Condenser* |
| 15 - | High-pressure safety valve* |
| q | Checking → Chapter. |
| 16 - | Air conditioner compressor* |
| 17 - | Air conditioning system magnetic coupling -N25- |
| q | Manufacturer: Sanden; designation: SD7-V16, repairing → Chapter. |
| q | Manufacturer: Zexel; designation: DCW-17D, repairing → Chapter. |
| 18 - | Receiver with dryer bag* |
