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Removing and installing parts of the air conditioning system - engine compartment > < Refrigerant oil

Octavia Mk2

Repairing the air conditioning system - engine compartment
   
Repairing the air conditioning system - engine compartment
  Note
t  The parts marked with an * must only be repaired in specialist service centres which have suitably trained personnel and are fitted out for working on the refrigerant circuit.
t  Comply with the safety measures when working on vehicles with air conditioning system and when using refrigerant R 134a and observe the instructions for working on the refrigerant circuit → Air conditioning system with refrigerant R134a; Rep. gr.00 technical data.
t  The engine must not be started if the refrigerant lines are not connected to the compressor and the compressor is shut off with plugs (risk of overheating because of the internal refrigerant oil circuit).
t  If the refrigerant circuit was separated, it is not always necessary to replace the dessicator, see → Chapter.
t  If the earth strap of the battery was disconnected, pay attention to the sequence when connecting it → Electrical System; Rep. gr.27.
1 - Fluid container with dessicator insert*
q   removing and installing → Chapter
q   Replace fluid reservoir (dessicator insert), if… → Chapter
2 - Regulating valve for compressor, air conditioning system - N280-*
q   Elements of the compressor, do not replace individually
  Note
Depending on the required cooling output the regulating valve receives a PWM signal (500 Hz) from the Climatronic control unitair conditioning control unit -J301- or from the Climatronic control unit -J255- and regulates the displacement of the compressor via the suction pressure/position of the articulated disc.
3 - Compressor*
q   various manufacturers: → Chapter; Contents
q   Removing and installing the refrigerant lines → Fig.
q   Belt protection for blocked compressor → Chapter
q   Removing and installing the compressor → Chapter
q   Running-in instruction → Chapter
4 - Condenser*
q   Removing and installing the refrigerant lines → Fig.
q   Removing and installing the condenser → Chapter
5 - High-pressure sender -G65-
q   function → Chapter
q   removing and installing → Fig.
q   inspect → Vehicle diagnostic tester in the function „Targeted fault finding“
6 - Pressure relief valve*
q   Replace O-ring ( → Electronic Catalogue of Original Parts).
q   Tightening torque: 10 Nm
q   function → Chapter
q   check → Chapter
7 - Extractor and filling valve*
q   High-pressure side
q   for exhausting, filling and measuring
q   Contents → Chapter
q   always screw on cap with gasket
q   Description, removing and installing → Chapter
8 - Clamp
9 - Retaining clip
10 - Exhaust valve*
q   Low-pressure side
q   for exhaust and measurement only
q   always screw on cap with gasket
q   Description, removing and installing → Chapter
11 - Expansion valve*
q   removing and installing → Chapter
12 - Holder for refrigerant lines
13 - 20 Nm

   
Remove refrigerant lines from the compressor
  Note
t  Empty the refrigerant circuit with the aid of the A/C service station.
t  After disconnecting, shut off the refrigerant lines and the compressor connections with suitable caps to protect them from the penetration of ambient humidity.
1 - 23 Nm
2 - Connection fitting for high-pressure line
t  Torsion stop with sleeve
3 - Connection fitting for low-pressure line
t  Torsion stop with sleeve
4 - O-ring (low-pressure side)
t  replace ( → Electronic Catalogue of Original Parts)
5 - Fitting sleeve
6 - Groove for O-ring
7 - O-ring (high-pressure side)
t  replace ( → Electronic Catalogue of Original Parts)
  S87-0249
Removing and installing the refrigerant lines of the condenser
1 - Connection fitting for condenser
2 - O-rings
t  replace ( → Electronic Catalogue of Original Parts)
3 - Connection fitting for refrigerant line
t  Torsion stop with sleeve
4 - 10 Nm
5 - Fitting sleeve
6 - Groove for O-ring
  Note
Shut off refrigerant line and condenser connection.
  S87-0248
Removing and installing, inspecting high pressure sender -G65-
–  Switch off the ignition and all electrical components.
–  Unplug 3-pin connector from high pressure sender -G65--1-.
–  Unscrew high pressure sender.
   Tightening torque: 8 Nm
–  Replace O-ring ( → Electronic Catalogue of Original Parts), moisten with refrigerant oil and carefully insert.
  Note
t  The refrigerant circuit remains closed, connection to valve.
t  The high pressure sender -G65--1- can also be fitted according to engine variant on another point close to the condenser.
Functional test
The function of the high pressure sender -G65- is checked via self-diagnosis of the air conditioning system control unit -J301- → Vehicle diagnostic tester.
  S87-0252

Removing and installing parts of the air conditioning system - engine compartment > < Refrigerant oil