Volkswagen Polo Service & Repair Manual: Refrigerant Circuit, Flushing
 Note
| For vehicles in which no adapters fit on to the refrigerant
pipes, for example, a blower pistol with rubber mouthpiece is to
be used to blow through individual components. Special care must
be taken not to damage the connections (crushing or scratching). |
| Evaporator is to be flushed via the connection for
low-pressure pipe (large diameter) after removing expansion
valve or removing restrictor. |
| Always flush components in direction opposite of refrigerant
flow direction.
|
| Check expansion valve and replace if dirty or corroded. |
| If there are dark, sticky deposits in the components that
cannot be removed with compressed air, replace these components. |
| Thin, light grey deposits on the insides of refrigerant
pipes do not impair the function of the components. |
| After flushing, always replace receiver/dryer or reservoir
and restrictor. Replace dryer cartridge or dryer on condensers
with attached dryer. |
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In order to be able to force moisture and other contaminants
out of refrigerant circuit, compressed air and nitrogen (to
force moisture out of refrigerant circuit) ar ...
Other materials:
Improvised Tools
Note
This list outlines the testers, tools and materials required
for expert refrigerant circuit repair work.
Caution
Non-approved tools or materials such as leak sealing
additiv ...
Checklist
To ensure your own safety and that of your passengers, observe
the following actions in the specified order :
Find a firm and level surface
suitable for lifting the vehicle.
Stop the engine, select a gear on a
manual gearbox or in case of automatic gearbox, move the selector lever ...
6-Pin Universal Oxygen Sensor, Removing and Installing
Note
Use the faulty sensor as a guide for installing all of the
accompanying attachments, cable ties or marking bands.
Do not crimp or cut the wires otherwise the functionality of
the heated oxygen sensor (HO2S) will ...
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