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Overview - components in the refrigerant circuits for front and rear seats > < Repair work on refrigerant circuit which may only be carried out in suitable workshops by specially trained mechanics, vehicles

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Repairing refrigerant circuit for front seats
Repairing refrigerant circuit for front seats
–  Observe notes → Chapter.
   
1 - Front evaporator
q   Removing → Chapter, Dismantling and assembling heater and air conditioning unit for front and rear seats.
2 - Seal
q   Watertight
3 - Threaded plate
4 - O-ring
q   14.0 mm; 1.82 mm
5 - O-ring
q   11.1 mm; 1.82 mm
6 - Expansion valve
q   Aperture must be sealed against splashed water.
q   Removing → Chapter
q   Task: the expansion valve atomises the instreaming refrigerant and regulates the flow so that the vapour, depending on heat transport, becomes a gas only upon reaching the outlet of the evaporator.
q   Identification: the expansion valves for R134a refrigerant circuits are marked with a green sticker.
7 - Bolt
q   7 ± 1.1 Nm
8 - O-ring
q   17.2 mm; 1.82 mm
9 - O-ring
q   8.13 mm; 1.82 mm
10 - Bolt
q   7 ± 1.1 Nm
11 - Refrigerant line
q   High-pressure side
12 - Refrigerant line
q   Low-pressure side
13 - Bolt
q   6 ± 0.75 Nm
14 - Air conditioner compressor
q   With air conditioning system magnetic clutch -N25-.
q   Removing and installing → Chapter
Running-in procedures → Chapter.
15 - Air conditioning system magnetic clutch -N25-
q   Manufacturer: Sanden
Repairs to the magnetic clutch with the air conditioner compressor installed should only be performed only as an exception.
q   Repairing air conditioning system magnetic clutch -N25- with the air conditioner compressor removed → Chapter
16 - Receiver with dryer cartridge
q   Removing dryer cartridge → Chapter
  Note
Under certain conditions, it is no longer necessary to renew the dryer cartridge each time the refrigerant circuit is opened; see Workshop Manual Air conditioning system with refrigerant R134a → Rep. Gr.00; Technical data; Renewing components.
17 - Evacuating 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.
18 - O-ring
q   10.8 mm; 1.82 mm
19 - O-rings
q   10.8 mm; 1.82 mm
20 - Socket head screw
q   22 ± 1 Nm
21 - O-ring
q   10.8 mm; 1.82 mm
22 - Socket head screw
q   12 ± 1 Nm
23 - Condenser
q   Removing → Chapter
24 - O-ring
q   14.3 mm; 2.40 mm
25 - High-pressure safety valve
  WARNING
Danger of freezing injuries.
When the pressure in the refrigerant circuit is too high (e.g. due to overfilling), refrigerant leaks out of high-pressure safety valve.
Wear protective goggles and suitable clothing.
q   Checking → Chapter
26 - Nut
q   6 ± 1 Nm
27 - Evacuating 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.
28 - 3/4" pipe
q   Release connection using release tool → Fig.
  Note
Depending on vehicle type, different bolts are installed for the refrigerant line on low-pressure side at air conditioner compressor inlet. M10x20 to 43 ± 6.5 Nm and M6x16 to 7 ± 1.1 Nm.
29 - O-ring
q   10.8 mm; 1.82 mm
30 - 3/8" pipe
q   Release connection using release tool → Fig.
31 - O-ring
q   10.8 mm; 1.82 mm
32 - Air conditioning system pressure switch -F129-* or high-pressure sender -G65-*
–  Removing: remove bolt from lower part of right front wheel housing and push aside front wheel housing.
q   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   Check air conditioning system pressure switch -F129- → 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 too high (for example, insufficient engine cooling).
q   Switches off the air conditioner when the pressure is too low (for example, loss of refrigerant).
q   Checking high-pressure sender -G65-: → Vehicle diagnosis, testing and information system VAS 5051
33 - O-rings
q   17.2 mm; 1.82 mm
q   Qty. 3
34 - O-rings
q   8.13 mm; 1.78 mm
q   Qty. 3
35 - Bolts
q   3 ± 0.45 Nm

   

Overview - components in the refrigerant circuits for front and rear seats > < Repair work on refrigerant circuit which may only be carried out in suitable workshops by specially trained mechanics, vehicles