Repairing refrigerant circuit for front seats — VW

Repairing refrigerant circuit for front seats
Observe notes
Chapter
.
Front evaporator
Removing
Chapter
, Dismantling and assembling heater and air conditioning unit for front and rear seats
Seal
Watertight
Threaded plate
O-ring
10.8 mm; 1.8 mm
Bolt
7 ± 1.1 Nm
Evacuating and charging valve
High-pressure side.
Releasing refrigerant into the environment is a criminal offence.
Removing and installing
Chapter
Capacities
Chapter
Bolts
4.5 ± 0.7 Nm
O-ring
10.8 mm; 1.8 mm
O-rings
11.1 mm; 1.8 mm
Qty. 2.
Excess pressure relief 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 excess pressure relief valve.
Wear protective goggles and suitable clothing.
Checking
Chapter
Condenser
Removing
Chapter
O-rings
20.4 mm; 1.8 mm
Qty. 2.
Note
Before installing, moisten O-rings with refrigerant oil and insert in air conditioner compressor.
O-ring
11.1 mm; 1.8 mm
Socket head bolt M6
7 ± 1.1 Nm
O-ring
8.13 mm; 1.78 mm
1/2" pipe
Release connection using release tool
Fig.
Hexagon bolt
8.5 ± 1.3 Nm
Bolt
30 ± 4.5 Nm
Air conditioner compressor
With
air conditioning system magnetic clutch
N25
.
Removing and installing
Chapter
Running-in procedures
Chapter
.
Air conditioning system magnetic clutch
N25
Manufacturer: Sanden
Repairs on
air conditioning system magnetic clutch
N25
with air conditioner compressor still installed should be performed only as an exception.
Repairing
air conditioning system magnetic clutch
N25
with the air conditioner compressor removed
Chapter
3/8" pipe
Release connection using release tool
Fig.
O-rings
8.13 mm; 1.78 mm
Qty. 2.
Nut
6 ± 0.9 Nm
Stud
9.6 ± 1.5 Nm
Receiver with dryer
Functions
Fig.
.
Note
Under certain conditions, it is not necessary to renew the receiver with dryer every time that the refrigerant circuit is opened. Refer to the workshop information under Heating, ventilation, air conditioning system; Air conditioning system with refrigerant R134a
Air conditioning system with refrigerant R134a
Rep. gr.
00
Renewing components
.
Removing receiver with dryer cartridge
Chapter
.
O-rings
17.2 mm; 1.8 mm
Qty. 2.
Socket head bolt M6
7 + 1.1 Nm
O-rings
8.13 mm; 1.78 mm
Qty. 2.
O-ring
10.8 mm; 1.8 mm
Evacuating and charging valve
Low-pressure side.
Releasing refrigerant into the environment is a criminal offence.
Removing and installing
Chapter
Capacities
Chapter
Protective cap*
Air conditioning system pressure switch
F129
or
high-pressure sender
G65
8 Nm
Renew O-ring (note part number).
The pressure switch can be removed without extracting the refrigerant from the refrigerant circuit.
Check
air conditioning system pressure switch
F129
Chapter
Function:
Switches
radiator fan
V7
to next higher speed when pressure increases in refrigerant circuit.
Switches off the air conditioner when the pressure is too high (for example, insufficient engine cooling).
Switches off the air conditioner when the pressure is too low (for example, loss of refrigerant).
Check
high-pressure sender
G65
:
Vehicle diagnostic tester
in the function
“guided fault finding.”
Renew O-ring.
O-ring
10.8 mm; 1.8 mm
3/4" pipe
Release connection using release tool
Fig.
Bolts
4 ± 0.5 Nm
O-ring
11.1 mm; 1.8 mm
O-ring
17.1 mm; 1.8 mm
Expansion valve
Aperture must be sealed against splashed water.
Removing
Chapter
Tasks: the expansion valve atomises the influent refrigerant and regulates the flow so that the vapour, depending on heat transport, becomes a gas only upon reaching the outlet of the evaporator
Identification: the expansion valves for R134a refrigerant circuits are marked with a green sticker.
Insulating cap*
O-ring
14 mm; 1.8 mm
Functions of receiver with dryer
The receiver collects the liquid droplets and directs them in a continuous stream to the expansion valve. Moisture which has entered the refrigerant circuit during assembly is collected by the dryer in the receiver.
Note
Under certain conditions, it is not necessary to renew the receiver with dryer every time that the refrigerant circuit is opened. Refer to the workshop information under Heating, ventilation, air conditioning system; Air conditioning system with refrigerant R134a
Air conditioning system with refrigerant R134a
Rep. gr.
00
Renewing components
.
Release connector:
release tools case
VAS 6127
with
release tool
VAS 6127/1
and
release tool
VAS 6127/2
.
Note
The flanges of the pipes are held together by spring pressure. If the spring is stretched with the release tool it is possible to pull the pipes apart.
Release tools case
VAS 6127
WARNING
Danger from escaping pressurised refrigerant!
Freezing of skin and other body parts.
Extract refrigerant and then immediately open refrigerant circuit.
If the refrigerant was extracted more than 10 minutes before the opening of refrigerant circuit, the refrigerant must be extracted again. The pressure in the circuit will increase due to subsequent evaporation.
Clamp
release tool
VAS 6127/1
(blue/black) or
release tool
VAS 6127/2
(red/white) around connector flange, push in direction of spring and then pull pipes apart.