Servicing air conditioner and heater - engine compartment — VW

Important!
Always disconnect the battery earthing strap before working on the electrical system.
Note:

Please obtain the anti-theft code of the radio before disconnecting the battery.
When the battery is reconnected, please remember to check the vehicle equipment (radio, clock) in accordance with the Workshop Manual and/or the Instruction Manual.
Parts marked with * can only be serviced at specially-equipped service workshops, as the refrigerant must be evacuated with the service station V.A.G 1885.

Service work on refrigerant circuit which may only be carried out in workshops with trained mechanics. (Service workshops specially equipped for air conditioning)
=>Page
87-37
.
This illustration is an example of the vehicle with the engine code AGL.

Fan housing
Removing => Page
80-34
Dismantling and assembling
=> Page
80-29

Housing for evaporator and heat exchanger*
In passenger compartment

Refrigerant line*
Expansion valve*
Extraction and filling valve*
Low-pressure side

Receiver drier*

Pressure switch for air conditioner -F129-
Testing pressure switch for air conditioner -F129- => page
87-62
Removing and installing:

Tightening torque 8 Nm
Replacing O-ring seal (observe spare part number).

Note:

A pressure switch can also be fitted at this fitting location, which only consists of one instead of two switches:

=> Current flow diagrams, electrical fault finding and fitting locations folder

Extraction and filling valve*
High-pressure side

Compressor*
Air conditioner magnetic coupling -N25-*

Thermo switch for air conditioner cut-off -F163-
Removing and installing => Fig.
1

Engine code letter AGL:

Switch section between chamber 2 and chamber 3:
Switches the radiator fan as the coolant temperature increases
(on at 112 5C, off at 108 5C).
Switch section between chamber 1 and chamber 4:
switches off the air conditioner magnetic coupling -N25- when coolant temperature is too high (off at 119 °C, on at 112 °C).

Engine codes AGK, ATA, AGX, APA, AHD, ANJ, BBE and BBF:

-F163- switches off the air conditioner magnetic coupling -N25- when the coolant temperature is too high
(off at 119°C, on at 112°C).

Condensor*
Radiator fan -V7-
Engine code letter AGL only
Fastened to condensor with 3 bolts

Vacuum hose
Connection diagram for vacuum hoses => Page
87-21

Two-way valve for fresh and recirculating air flap -N63-
If vacuum unit vents and releases, fresh air mode applies
Connection diagram for vacuum hoses => Page
87-21
Removing => Page
80-37

Vacuum hose

Vacuum hose for fresh and recirculating air flap
Connection diagram for vacuum hoses => Page
87-21
Vents: Fresh air mode
The fresh air path is opened when the vacuum unit releases
Removing => Page
80-37

Fresh air blower relay - 4th speed -J407-
Removing => Page
80-38

Fig.1
Removing and installing thermo switch for air conditioner cut-off -F163-

Note:

The cooling system is pressurised when the engine is hot. If necessary relieve pressure before repairs.
Fill up with coolant after installing the thermo switch.

1 -
Thermo switch for air conditioner cut-off -F163-
2 -
O-ring
3 -
Clip
4 -
Refrigerant connection