Volkswagen Polo Service & Repair Manual: Discharge Refrigerant Circuit with A/C Service Station
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. |
|
| Work procedure may vary depending on the type of tools
selected (the tool-specific operating instructions should
therefore be followed). |
| The refrigerant circuit is to be discharged if parts of the
refrigerant circuit are to be removed, if there is any doubt
about the quantity of refrigerant in the circuit or if safety
precautions so require. |
| All the necessary usage information for working with the
refrigerant service station can be found in the service station
operating instructions. |
| – |
Connect A/C service station in line with operating
instructions to vehicle service connections. Refer to
→ Rep. Gr.87 and start up service station. |
Note
| There is a possibility of refrigerant oil being extracted
from the refrigerant circuit together with the refrigerant. To
ensure compressor lubrication, the refrigerant oil in the
circuit must be topped up with fresh oil. Refer to
→ Rep. Gr.87. |
| On vehicles with an A/C compressor without a magnetic clutch
(with A/C Compressor Regulator Valve -N280-), the engine should
run < 10 minutes with the refrigerant circuit empty and closed
(the A/C compressor also runs continuously). The engine RPM must
not exceed 2000 RPM. |
| On vehicles equipped with an A/C compressor with A/C clutch,
the engine must be started since the A/C Pressure Switch -F129-
or High Pressure Sensor -G65- (checks whether refrigerant is
present in the circuit) switches off the A/C clutch as soon as
there is no refrigerant in the refrigerant circuit. |
|
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 ...
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A/C Service Station, Connecting for Measuring and Testing
Refrigerant Circuit with A/C Service Station, Draining