Volkswagen Polo Service & Repair Manual: Welding and Soldering on Refrigeration Systems

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / A/C System, General Information / Safety Precautions / Welding and Soldering on Refrigeration Systems

Before performing welding or soldering work on vehicles near the air conditioning system components, extract the refrigerant and remove the residue by flushing with compressed air and nitrogen.

The products of refrigerant decomposition due to the effect of heat are not only toxic, but may also have a highly corrosive effect on pipes and system components. They mainly take the form of hydrogen fluoride.

Pungent Odor

A pungent odor indicates that the products of decomposition mentioned above have already formed. Avoid inhaling these substances under all circumstances, as otherwise the respiratory system, lungs and other organs could be damaged.

First Aid

Following contact with eyes or mucous membranes, immediately rinse with copious amounts of running water and consult an eye specialist.

Following contact with the skin, immediately remove affected clothing and rinse skin with copious amounts of water.

Following inhalation of highly concentrated refrigerant vapors, immediately take the affected person into the open air. Call a doctor. Administer oxygen in the event of breathing difficulties. If the affected person has difficulty breathing or cannot breathe, tip head back and perform mouth to mouth respiration.

Product Characteristics

Refrigerants used in motor vehicle air conditioning systems belong to the new generation of refrigerants based on chlorine-free, partially fluorinated hydrocarbons (H ...

Handling Pressure Vessels

Secure vessels to prevent them falling over! Secure upright cylinders to stop them falling over and cylinders lying flat to stop them rolling away. ...

Other materials:

New wheels and tyres
First read and observe the introductory information and safety warningsNew tyres Drive particularly carefully for the first 600 km with new tyres as the tyres have to be run in. Tyres that have not been run in have reduced grip and braking effect . All four wheels must be fitted ...

Tires, Reinforced, Extra Load
Some time ago, the designation “Reinforced” was replaced with the designation “Extra Load” by some tire manufacturers. In countries outside Europe, this designation has been conventional for some time. There are no technical differences. ...

Checking with Expansion Valve and Receiver/Dryer, with Internally Regulated A/C Compressor
Note Connecting service station. Refer to → Chapter „Connecting Service Station“. Observe test requirements. Refer to → Chapter „Pressures, Checking“. – ...