Volkswagen Golf Service & Repair Manual: Welding and soldering on refrigeration systems

Volkswagen Golf Service & Repair Manual / Air conditioning system with refrigerant R134a / General notes on air conditioning systems / General safety / Welding and soldering on refrigeration systems

Before welding and brazing on vehicles (in the vicinity of the air conditioning system components), extract the refrigerant and then purge the system by blowing through with compressed air and using nitrogen.

The products of decomposition of refrigerants under heat are not only poisonous but are strongly corrosive, so that pipework and system parts could be attacked. This refers primarily to hydrogen fluoride.

Pungent smell

A pungent odour indicates that the products of decomposition mentioned above are already present. Breathing in these substances must be avoided under all circumstances, or the bronchial tubes, lungs and other organs could be injured.

Handling refrigerants

WARNING Danger of freezing injuries. The refrigerant can emerge as liquid or as vapour. ...

First aid

In the event of contact with the eyes or mucous membranes, wash immediately with copious running water and summon an eye specialist. In t ...

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