Volkswagen Golf / Golf GTI / Jetta. Service manual - part 1009

. 

- All air ducts, covers and seals 
OK and properly installed 

- Electrical system and vacuum 
system fault-finding has not 
revealed any malfunctions. See 
vehicle specific Repair Manual 

 
 

. 

 Repair Manual, Heating & Air 

Conditioning, Repair Group 87 , 

- On Board Diagnostics (OBD) of 
A/C system using diagnostic 
operation system VAS 5051A in 
"Guided Fault Finding" cannot 
detect any malfunction, no shut-off 
condition for A/C compressor is 
displayed in measuring value 
block (only in vehicles with "A/C 
system" OBD). 

- Air flow through dust and pollen 
filter not obstructed by dirt. See 
vehicle specific Repair Manual 

 
 

. 

 Repair Manual, Heating & Air 

Conditioning, Repair Group 87 , 

- Air conditioner unit not drawing in 
secondary air at maximum fresh 
air blower speed. Evaporator and 
heater not drawing in secondary 
air at maximum fresh-air blower 
speed. See vehicle specific Repair 
Manual 

 
 

. 

 Repair Manual, , Repair Group 

87, 

- Air flaps in air conditioner unit, 

Pressures, checking on vehicles

13/2/2005

heater and evaporator reach end 
position. See vehicle specific 
Repair Manual 

 
 

. 

 Repair Manual, Heating & Air 

Conditioning, Repair Group 87 , 

- Fresh-air intake ducts beneath 
hood and in passenger 
compartment as well as 
corresponding water drain valves 
OK, see vehicle specific Repair 
Manual 

 
 

 Repair Manual, Heating & Air 

Conditioning, Repair Group 87 , 

- Engine at normal operating 
temperature 

- Vehicle not standing in direct 
sunlight 

- The ambient temperature is 
greater than 15   C. 

- All instrument panel vents open. 

- With engine running and A/C 
system set to maximum cooling 
performance: 

 
 

 Repair Manual, Heating & Air 

Conditioning, Repair Group 87 , 

 

Set cooling performance to 
maximum.

Setting on A/C Control Head E87 : 

- Preselect "Auto" mode (A/C 
compressor on). 

- Set temperature selection "LO" 
for drivers and front passengers 
side. 

Pressures, checking on vehicles

13/2/2005

 

 

Setting on heater controls:

- Press A/C button and Rec- or 
recirculated air button. 

- Turn rotary temperature control 
towards "Cold" stop. 

- Set rotary fresh-air blower control 
to "4" . 

- Coolant Fan(s) V7 operating (at 
least stage 1).* 

Note: 

- For certain versions, fan is 
switched on only after the 
pressure in refrigerant circuit has 
exceeded a specified value. 

- Operation of Fresh Air Blower V2 
at maximum speed. 

- Recirculated/fresh-air flap set to 
"Recirculated air mode" (within 1 
min. after starting vehicle, air flow 
flap is closed and recirculated air 
flap opened).* 

- Coolant shutoff valve closed.* 

- Valves of pump valve unit closed 
and no coolant circulation pump 
delivery.* 

Pressures, checking

 

- Switch ignition off. 

- Connect service station 

 

00-6, 

Service station, connecting

 . 

- Take pressure gauge readings 
(two possible results). 

Ambient temperature (in degrees 

Celsius)

Pressure in refrigerant circuit in bar positive 

pressure

+15   C 

3.9

+20   C 

4.7

+25   C 

5.6

+30   C 

6.7

+35   C 

7.8

+40   C 

9.1

Pressures, checking on vehicles

13/2/2005

+45   C 

10.5

Note: 

- Temperature of refrigerant circuit 
components should be equal to 
ambient temperature. 

- Pressure will deviate from values 
in table if individual components of 
refrigerant circuit are warmer or 
colder. 

- At absolute pressure, 0 bar 
corresponds to absolute vacuum. 
Normal ambient pressure (positive 
pressure) equals 1 bar absolute 
pressure. 0 pressure corresponds 
to an absolute pressure of one bar 
on most pressure gauges 
(indicated by -1 bar below 0). 

- On vehicles with High Pressure 
Sensor G65 for which measured 
pressure is displayed in measured 
value block, pressure measured 
should coincide with values in 
table. 

 
 

 Repair Manual, Heating & Air 

Conditioning, Repair Group 87 , 

 

Pressure in refrigerant circuit 
lower than indicated in table.

 

Not enough refrigerant in 
refrigerant circuit.

- Determine whether refrigerant 
circuit is leaking 

 

00-4, 

Refrigerant circuit, tracing leaks 
using leak detector V.A.G 1796

 . 

- Check pressure relief valve. 

 

If pressure relief valve has 
responded:

- Check actuation of radiator fans. 

- Check for constricted refrigerant 
pipe and hose cross-sections 

Pressures, checking on vehicles

13/2/2005