Repairing air conditioning and heating - engine compartment — VW

Repairing air conditioning and heating - engine compartment
WARNING
Always disconnect the battery earth strap before working on the electrical system.
Note
Obtain radio anti-theft code before disconnecting battery.
When the battery is reconnected, check the vehicle equipment (radio, clock) according to workshop manual and/or owner's manual.
Parts marked with an * can be repaired only in workshops with suitable equipment and specially trained mechanics because the refrigerant must be evacuated beforehand using, for example, the
air conditioning service station
VAS 6007A
.
Repair work on refrigerant circuit which may be performed only in appropriate workshops by specially trained mechanics
Chapter
.
This figure shows a vehicle with engine code AGL.
Blower housing
Removing
Chapter
Dismantling and assembling
Chapter
Housing for evaporator and heat exchanger*
In passenger compartment
Refrigerant line*
Expansion valve*
Evacuating and charging valve*
Low-pressure side
Receiver with dryer*
Under certain conditions, it is no longer necessary to renew the receiver with dryer each time the refrigerant circuit is opened
Rep. Gr.
00
Technical information
“Air conditioning systems - with refrigerant R134a VW”
Renewing parts.
Air conditioning system pressure switch
F129
Check
air conditioning system pressure switch
F129
Chapter
Removing and installing:
Torque setting 8 Nm
Renew O-ring (note part number)
Note
At this location, there may be installed a pressure switch with only one instead of two switches
Current flow diagrams, Electrical fault finding and Fitting locations
Evacuating and charging valve*
High-pressure side
Air conditioner compressor*
Air conditioning system magnetic clutch
N25
Air conditioning system shut-off thermal switch
F163
Removing and installing
Fig.
Engine code AGL:
Switch part between chamber 2 and chamber 3: switches radiator fan on at 112° C as coolant temperature rises and off at 108° C
Switch part between chamber 1 and chamber 4: switches
air conditioning system magnetic clutch
N25
off when coolant temperature is too high (off at 119° C and on at 112° C)
Engine codes AGK, ATA, AGX, APA, AHD, ANJ, BBE, BBF:
Thermal switch for air conditioning system shut-off
F163
switches
air conditioning system magnetic clutch
N25
off when the refrigerant temperature is too high (off at 119° C, on at 112° C)
Condenser*
Radiator fan
V7
Engine code AGL only
Secured to condenser with 3 bolts
Vacuum hose
Vacuum hose connection diagram
Chapter
Two-way valve for fresh air and air recirculation flap
N63
Vacuum unit is vented and relaxed during fresh air operation
Vacuum hose connection diagram
Chapter
Removing
Chapter
Vacuum hose
Vacuum unit for fresh air and air recirculation flap
Vacuum hose connection diagram
Chapter
Ventilated: fresh air operation
Fresh air duct is open when vacuum unit is relaxed
Removing
Chapter
Operating and display unit for auxiliary heater
E407
Removing
Chapter
Removing and installing
air conditioning shut-off thermal switch
F163
WARNING
Danger of scalding injuries.
The cooling system is pressurised. When the engine is warm, the coolant temperature may be above 100° C.
If necessary, release pressure before carrying out repairs.
Note
Refill with coolant after installing thermal switch.
Air conditioning system shut-off thermal switch
F163
O-ring
Clip
Coolant connection