Volkswagen Polo Service & Repair Manual: 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. |
| If dropped, the vessels could be so severely deformed that
they rupture. The refrigerant evaporates immediately, liberating
considerable force. Flying fragments of cylinders can cause
severe injuries. |
| Valves may break off if cylinders are not properly
transported. To protect the valves, cylinders are only to be
transported with protective cap screwed on. |
| Never store in the vicinity of radiators. |
| High temperatures may occur next to radiators. High
temperatures are also accompanied by high pressures and the
maximum permissible vessel pressure may be exceeded. |
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Not Warming Above 50 °C (122 °F)
To avoid possible risk, pressure vessel regulations specify that vessels are
not to be heated to in excess of 50 °C (122 °F).
Heating Warning
| Do not heat with a naked flame under any circumstances.
Localized overheating can cause structural changes in the vessel
material, which then reduce its ability to withstand pressure.
There is also a danger of refrigerant decomposition due to
localized overheating. |
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Empty Containers
| Empty refrigerant vessels must always be sealed to prevent
the ingress of moisture. Moisture causes steel vessels to
corrode. This weakens the vessel walls. In addition, rust
particles entering into refrigeration systems from vessels will
cause malfunctioning. |
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Before performing welding or soldering work on vehicles near
the air conditioning system components, extract the refrigerant
and remove the residue by flushing with c ...
Make sure the shut-off valves are closed before connecting
the charging system to the air conditioning system.
Make sure the process is finishe ...
Other materials:
Checklist
The following steps should always be carried out in the specified
order before working in the engine compartment :
Park the vehicle on a level and stable surface.
Depress and hold the brake pedal until the
engine has stopped.
Apply the handbrake firmly Braking, stopping
and p ...
A/C without Magnetic Clutch with Torsion-Elastic Clutch
Caution
Non-approved tools or materials such as leak sealing
additives can cause damage or malfunctions in the
system.
Only use tools and materials approved by the
manufactu ...
4-Pin Heated Oxygen Sensor (HO2S), Removing and Installing
Note
Do not repair the heated oxygen sensor wires. Repairing may
result in malfunctions.
Use the faulty sensor as a guide for installing all of the
accompanying attachments, cable ties or marking bands.
...
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Welding and Soldering on Refrigeration Systems
Extraction and Charging System Safety Regulations