Volkswagen Golf / Golf GTI / Jetta. Manual - part 1008

00 - 5

Complaints

 

Possible complaints at refrigerant circuit

 

Note: 

- A/C system is functioning correctly when a temperature of 
7 

0

 C or lower escapes at instrument panel air vents. 

- Setting on Climatronic "LO" . 

- Setting on A/C system "AC" on; "max" ; "cold" . 

Test requirements:

 

- 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). 

 
 

 Repair Manual, Heating & Air Conditioning, Repair 

Group 87 , 

Possible complaints

 

Note: 

- For all complaints marked by * 

 

00-7, Pressures, 

checking on vehicles

 . 

- Total failure of cooling system.* 

- Insufficient cooling performance at all vehicles speeds or 
engine speeds.* 

- None or insufficient cooling after driving a few miles.* 

- A/C compressor, A/C Clutch N25 or A/C Compressor 
Regulator Valve N280 are switched off by A/C Refrigerant 
Low Pressure Switch F73 , A/C Refrigerant High Pressure 
Switch F118 , A/C Pressure Switch F129 or by A/C Control 
Head E87 or Climatronic Control Module J255 due to 
excessive or insufficient pressure.* 

- None or sharp decrease in fresh-air supply after driving 
several miles (evaporator iced up).* 

 

From these, the following complaints may also occur:

 

Complaints

13/2/2005

 

A/C compressor makes noise

- Re-tighten securing bolts for A/C compressor and A/C 
compressor bracket using a torque wrench.  

- Check routing of refrigerant pipes; they must not touch 
other components and must not be subject to strain (align if 
necessary). 

 

Noise (refrigerant hammer) occurring immediately after 
switching on air conditioner and/or when cornering or 
braking:

- Discharge, evacuate and re-charge refrigerant circuit (too 
much refrigerant in circuit). 

Note: 

- Too much refrigerant oil in the circuit may also result in 
this problem (no adjustment of refrigerant oil quantity, for 
example, on replacing compressor). 

 

Water sprays out of vents (in dash panel or footwell) 
although air conditioning system is otherwise 
functioning properly:

- Check proper routing of condensate drain; it must not be 
crushed or kinked. 

- Check valve for condensation water hose, it must not 
become stuck by wax or underbody sealant and must open 
and close properly. 

- Check plenum chamber cover; it must not be damaged 
and must be properly installed (to stop water running into 
evaporator). 

- Check water drains in plenum chamber; they must not be 
blocked (e.g. by leaves). 

Complaints

13/2/2005

00 - 6

Service station, connecting

 

On vehicles with connection on low and 
high-pressure side of refrigerant circuit

 

Service station, connecting for measurement 
and testing

 

- Switch ignition off. 

- Connect service station to power supply. 

- Connect quick-release coupling adapter to charging 
hoses of service station (handwheels not screwed in/hand 
shut-off valve not open). 

- Switch on service station and evacuate charging hoses 
(only necessary if there is air in charging hoses).  

- Switch off service station. 

- Unscrew caps from service connections (with valve).  

- Connect service station via service connections with 
quick-release coupling adapters to vehicle refrigerant 
circuit. 

- Screw in handwheel of quick-release coupling adapters 
until valves are definitely open at refrigerant circuit 
connection (observe pressure gauge, do not strain valves).  

- Perform planned tests and measurements. 

Service station, connecting

13/2/2005

00 - 7

Pressures, checking on 
vehicles

 

Pressures in refrigerant 
circuit, checking (using 
service station)

 

Note: 

- Check cooling performance. A/C 
system is functioning correctly 
when a temperature of 7 

0

 C or 

lower escapes at instrument panel 
air vents. 

- Setting on Climatronic "LO" . 

- Setting on A/C system "AC" on; 
"max" ; "cold" . 

- Connections with valve and 
service connections for measuring 
and testing. 

Test requirements

 

- Radiator and condenser clean 
(clean if necessary) 

- Thermal insulation at expansion 
valve OK and properly installed. 
See vehicle specific Repair 
Manual 

 
 

. 

 Repair Manual, Heating & Air 

Conditioning, Repair Group 87 , 

- Ribbed belt is OK and properly 
tensioned. Ribbed belt for A/C 
compressor and generator are OK 
and correctly tensioned. See 
vehicle specific Repair Manual 

 
 

 Repair Manual, Heating & Air 

Conditioning, Repair Group 87 , 

Pressures, checking on vehicles

13/2/2005