Volkswagen Golf / Golf GTI / Jetta. 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