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1 Safety precautions
(AKAH000011; Edition 04.2018)
1.1 Fuel tank and fuel pipes
Take extreme care when performing sanding and welding work
near the tank or other components carrying fuel. If in doubt, al‐
ways remove these components.
All relevant health and safety regulations must be complied with
when working on vehicles with natural gas tank.
1.2 Air conditioning system / refrigerant
No welding, brazing or soldering may be performed on parts of
the charged air conditioner system. This also applies to any other
part of the vehicle if there is a risk that parts of the air conditioner
system could heat up. When performing paintwork repairs, object
temperatures of 80° C must not be exceeded in the drying oven
or preliminary heating area, because heat causes a major pres‐
sure increase in the system which leads to a high-pressure safety
valve on the air conditioner compressor being activated.
Note
The refrigerant must also be extracted from the circuit when arc-
welding in the vicinity of the refrigerant hoses. Arc-welding emits
invisible ultraviolet rays which can penetrate the refrigerant hoses
and decompose the refrigerant.
1.2.1 Remedy:
Extract refrigerant from refrigerant circuit ⇒ Air conditioning sys‐
tem; Rep. gr. 87 ; Heating, air conditioning
1.3 Electronic control units
Connect the earth connection of the electric welding appliance
directly to the part which you are welding. When doing this, make
sure that there are no electrically insulating parts between the
earth connection and the welding point.
Earth connection and welding electrode must NOT make contact
with the electronic control units or the electrical wiring.
After an accident, the electronic control units only have to be re‐
newed if at least one of the following conditions applies:
♦ The housing is visibly deformed or damaged.
♦ The contact surface or the mounting bracket is deformed (al‐
though no external damage to the control unit is apparent).
♦ The connector is damaged or has been corroded by moisture.
♦ Functional check or self-diagnosis of the control unit indicates
the fault “Control unit defective”.
If electronic components (e.g. ABS control units) were removed
in order to carry out repair work and have now been re-installed,
they must be checked according to the documentation available;
for example, V.A.G. self-diagnosis must be performed.
General InformationBody Repairs, General Body Repairs - Edition 04.2018
1. Safety precautions 1
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