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:

Rain/light sensor
Fig. 75 Windscreen wiper lever: setting the rain/light sensor Ⓐ Fig. 76 Sensitive surface of the rain/light sensor First read and observe the introductory information and safety warnings When the rain/light sensor is activated, it automatically controls the frequency of the wiper inte ...

Lights and vision – functions
First read and observe the introductory information and safety warnings Parking light Depending on the vehicle equipment level, when the parking lights (left and right turn signals) are switched on, the headlight and the tail light on the corresponding side of the vehicle light up. The park ...

Snow Chains
Snow Chins, Assembly and Replacing Snow chains may be mounted only on the drive wheels. If the vehicle has AWD, then snow chains may be used on the front wheels only. Snow chains are not possible with all wheel/tire com ...