Volkswagen Polo Service & Repair Manual: Refrigerant Circuit with A/C Service Station, Filling
Caution
| If it is suspected that chemicals were added to the
refrigerant circuit to seal leaks, do not connect the
A/C service station and do not extract the refrigerant. |
| Chemicals that seal leaks in the coolant circuit
form deposits that affect the function of the A/C system
and lead to failure of the A/C system and the A/C
service station. |
| Inform that customer that there are substances in
the A/C system that are no approved by Volkswagen. This
A/C system cannot be drained or serviced in the
workshop. |
|
 Note
| The chemical materials (stop leak additive) for sealing
leaks in the refrigerant circuit offered on the market are not
approved by VW Audi AG. There are no permanent- ,validity or
material compatibility tests. Therefore damage or malfunctions
in the A/C system or the A/C Service Station cannot be excluded. |
| The stop leak additives offered on the open market have
different physical and chemical properties, which can impair the
function of the A/C system and the A/C Service Station and can
even shut down the system completely. |
| VW does not approve the use of chemicals to seal leaks in
the refrigerant circuit. |
| Chemicals used to seal leaks in the refrigerant circuit
often react with air and the moisture in it. They cause deposits
in the refrigerant circuit and the A/C service station and
malfunctions in valves and other components that they come in
contact with. These deposits cannot be removed completely from
the components. |
| Chemicals used to seal leaks in the refrigerant circuit
usually cannot be detected from outside. The label that should
be applied to identify it is often missing. Therefore be careful
when working with if you do not know its service history. |
| Accessories offer containers used to separate out these
chemicals (used to seal leaks in the refrigerant circuit).
Because VW does not approve the use of these chemicals, there is
no evidence of the effectiveness of these filters. |
WARNING
| High voltage within the high voltage system. Danger
of electric shock in the A/C compressor! |
| Disable high voltage system. Refer to
→ Electric Drive; Rep. Gr.93. |
|
| The work procedure is always to be performed as described in
the operating instructions for the A/C service station. |
| Before pouring in refrigerant, correct the quantity of
refrigerant oil. Refer to
→ Rep. Gr.87. |
| The entire refrigerant charge can be added to either the
high or low pressure side. |
| Refrigerant circuit, charging |
| – |
Turn off the ignition. |
| – |
Drain the refrigerant circuit with A/C service station.
Refer to
→ Chapter „Refrigerant Circuit with A/C Service Station,
Draining“. |
| – |
Screw out handwheel at quick-release coupling adapter (to
close it). |
| – |
Allow refrigerant to flow into charging hose. |
| – |
Tighten the handwheel on the quick-release coupling adapter
without putting too much pressure on the valve and add the
specified amount of refrigerant. |
| – |
Switch off A/C service station. |
Note
| If A/C compressor was removed, it must be cranked by hand at
ribbed belt pulley/freewheel approximately 10 rotations before
bringing into operation for the first time. The
electrically-driven A/C compressor is not affected by this. This
prevents damage in the A/C compressor due to liquid when
switching the A/C system on. If there is oil in the A/C
compressor cylinder, it will be forced out. |
| – |
Start engine with compressor switched off (version with A/C
clutch). |
| – |
Set the A/C compressor to minimum output, for example,
"ECON" mode or A/C off (version with no A/C clutch with
regulator valve). |
| – |
Wait until idle speed has stabilized. |
| – |
Switch on the compressor and operate the system for at least
two minutes at idling speed. |
| – |
If necessary, check pressures in refrigerant circuit using
A/C service station. |
| – |
Screw out handwheel on quick-release coupling adapter. |
| – |
Disconnect charging hose from refrigerant circuit. |
| – |
Screw protective caps back on. |
|
Caution
If it is suspected that chemicals were added to the
refrigerant circuit to seal leaks, do not connect the ...
Caution
If it is suspected that chemicals were added to the
refrigerant circuit to seal leaks, do not connect the ...
Other materials:
Indicator lamps and fuel gauge
Fig. 129 In the instrument cluster: Variants
A and B: fuel gauges for petrol and diesel. Variant C: fuel gauge for autogas
First read and observe the introductory information
and safety warnings 
Lit up
Needle position 
Possible cause †...
Flushing Circuit Block Diagrams
Note
The arrows in the following illustrations show the direction
of refrigerant flow while flushing. During flushing, refrigerant
flows in the opposite direction than during A/C system
operation, therefore the high pressure side of A/C se ...
Running-in
First read and observe the introductory information
and safety warningsPlease follow the regulations concerning running-in new
parts.
Running in a new engine
Any new engine has to be run in during the first 1,500 kilometres. During its
first few hours of running, the internal friction in the ...
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Refrigerant Circuit with A/C Service Station, Draining
A/C System, Operating after Charging