6.4. Troubleshooting – Faults
Electrical faults
The individual circuits must be systematically checked in accordance with the circuit diagram. Plug connections and such
electrical components as switches, relays, etc. should preferably be checked for continuity at the same time.
The following fault causes must always be checked to exclude the possibility of faults due to any of these causes:
– Corrosion of plug contacts
– Loose contact in plug connectors
– Corrosion on wiring
– Corrosion on battery poles
– Abraded wiring
– Correct operation of fuse
Faults in the air-conditioning system
The following faults may occur in the air-conditioning system and disable it:
– Activation of the defrost system
– Activation of the high-pressure / low-pressure switch
– Defective refrigerant compressor
– Defective evaporator or condenser fan
– Loss of refrigerant due to leaks
– Soiled air filters or heat exchanger fins
– Blockage in the refrigeration system (e.g. filter drier)
– Defective expansion valve
Faults in the refrigerant circulation
If faults develop in the refrigerant circulation, the air-conditioning system must be checked and repaired by an authorized
specialist workshop.
IMPORTANT:
The refrigerant must not be discharged into the atmosphere (Section 8 of the regulation dated 06.05.1991 banning CFCs and
halon compounds).
NOTE:
To ensure trouble free operation of the air conditioner, the refrigeration oil and the filter drier must be replaced 6 months after
the initial operation of the vehicle. The filter drier should be replaced every year at the beginning of the season. These activities
are to be performed by an authorized qualified workshop, which should also perform a functional check of the air conditioner as
well as a leak test. Warranty claims can only be accepted if the claimant can prove that the maintenance and safety instructions
have been strictly observed.
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