Note | Damaged or leaky components of the air conditioning system must not be repaired by welding or soldering, however they must be replaced. |
| Before welding and soldering on vehicles (in the vicinity of components of the air conditioning system) the refrigerant must be drained off and the residues must be removed by blowing through with compressed air and nitrogen. |
| The products of decomposition resulting from the refrigerant through the effect of the heat are not only toxic, but are also highly corrosive, so that pipes and components can be attacked. It is essentially hydrogen fluoride. |
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