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Removing extraction and charging valve, low pressure side > < Repair work on refrigerant circuit which may be performed only in workshops with specially trained mechanics

Golf Mk4

Repairing refrigerant circuit components
   
Repairing refrigerant circuit components
  Note
t  The refrigerant must be extracted beforehand, e.g. with air conditioning service station -VAS 6007A-.
t  The previously used service stations can still be used ⇒ Volkswagen Workshop Equipment catalogue.
t  Safety measures when working on an evacuated refrigerant circuit → Chapter.
t  Only the components marked with an “*” can be replaced without opening and evacuating.
t  All of the refrigerant circuit's components that have been opened must be sealed with suitable plugs to prevent the ingress of moisture.
t  The colour coding of O-rings for R134a refrigerant circuits has been discontinued. Coloured and black O-rings are used.
t  Moisten threaded connections of refrigerant circuit with polyethylene glycol (PEG) VW part number 294440 before installation.
t  Under certain conditions, it is no longer necessary to renew the receiver each time the refrigerant circuit is opened → Rep. Gr.00Technical information “Air conditioning systems - with refrigerant R134a VW” Renewing parts.
1 - Bolt
q   15 Nm.
2 - O-ring
q   10.8 mm; 1.8 mm.
3 - Receiver with dryer bag
q   Functions → Chapter.
4 - O-ring
q   10.8 mm; 1.8 mm.
5 - Refrigerant line
q   From receiver with dryer bag to expansion valve.
6 - Bolt
q   15 Nm.
7 - Air conditioning system pressure switch -F129-* or high pressure sender -G65-*
Removing and installing:
q   Torque setting 8 Nm
q   Renew O-ring (note part number).
q   Air conditioning system pressure switch -F129- and high pressure sender -G65- can be removed without having to evacuate refrigerant from refrigerant circuit.
q   The high pressure sensor -G65- cannot be checked via the Climatronic self-diagnosis, but only via the engine control unit.
q   Checking: vehicle diagnosis, testing and information system -VAS 5051B- in guided fault finding.
q   The high pressure sensor -G65- supplies information to radiator fan control unit -J293- and engine control unit.
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).
8 - O-ring
q   10.8 mm; 1.8 mm.
9 - Schrader valve
10 - Threaded plate
11 - O-ring
q   10.8 mm; 1.8 mm.
12 - Expansion valve
q   In engine compartment on right.
q   Aperture must be sealed against splashed water.
q   Removing → Chapter.
Function
t  The expansion valve atomises incoming refrigerant and regulates the flow so that, depending on the heat transport, the vapour does not become a gas until it reaches the outlet of the evaporator.
t  The expansion valves for R134a refrigerant circuits are marked with a green sticker.
13 - Bolts
q   8 Nm.
14 - O-ring
q   14 mm; 1.8 mm.
15 - Damper
q   In refrigerant hose from expansion valve to air conditioner compressor.
q   For vehicles with the engine code BDE near the expansion valve.
16 - Extraction and charging valve
q   Low pressure side.
q   Releasing refrigerant into the environment is a punishable offence.
q   Removing and installing → Chapter.
q   Capacities → Chapter.
17 - Refrigerant hose
q   From expansion valve to air conditioner compressor.
q   With damper.
18 - Extraction and charging valve
q   High pressure side.
q   Releasing refrigerant into the environment is a punishable offence.
q   Removing and installing → Chapter.
q   Capacities → Chapter.
19 - O-ring
q   10.8 mm; 1.8 mm.
20 - Evaporator
q   In passenger compartment.
q   Removal → Chapter, Dismantling and assembling evaporator housing.
21 - O-ring
q   16.7 mm; 1.8 mm.
22 - Heat insulation*
23 - O-ring
q   7.6 mm; 1.8 mm.
24 - Bolt
q   8 Nm.
25 - Refrigerant hose
q   From air conditioner compressor to condenser.
26 - Bolt
q   15 Nm.
27 - O-ring
q   10.8 mm; 1.8 mm.
28 - Condenser
q   Removing → Chapter.
29 - Air conditioner compressor
q   With air conditioning system magnetic coupling -N25-.
q   Repairing air conditioning system magnetic coupling -N25- → Chapter.
q   An air conditioner compressor with no air conditioning system magnetic coupling -N25- is installed in vehicles with engine code BAD. Notes → Chapter.
30 - O-ring
q   14.3 mm; 2.4 mm.
31 - Bolts
q   20 Nm.
32 - O-ring
q   10.8 mm; 1.8 mm.
33 - High-pressure safety valve
q   Checking → Chapter.
34 - Air conditioning system magnetic coupling -N25-
Manufacturer Sanden:
q   Repairing air conditioning system magnetic coupling -N25- → Chapter.
Manufacturer Zexel:
q   Repairing air conditioning system magnetic coupling -N25- → Chapter.

   

Removing extraction and charging valve, low pressure side > < Repair work on refrigerant circuit which may be performed only in workshops with specially trained mechanics