Volkswagen Polo Service & Repair Manual: Refrigerant Circuit with A/C Service Station, Draining
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. |
| The work procedure is always to be performed as described in
the operating instructions for the A/C service station. |
| The procedure described here is for the A/C Service Station
-VAS6007A-. |
| Before filling the refrigerant circuit with refrigerant, it
should be evacuated (vacuum) for 45 minutes on systems with 1
evaporator and 60 minutes on systems with 2 evaporators.
Moisture is also extracted from the circuit. |
| Leaks may be found when evacuating the refrigerant circuit. |
Caution
| Do not start the engine during the evacuation
process or when there is a vacuum in the refrigerant
circuit. |
| The A/C compressor could be damaged if the engine is
started when there is a vacuum in the refrigerant
circuit. |
| Only start the engine when the refrigerant circuit
is filled. |
|
| – |
Check refrigerant oil quantity in refrigerant circuit if
necessary, see vehicle-specific repair manual. Refer to
→ Rep. Gr.87. |
| – |
Connect the A/C service station to the power supply. |
| – |
Check the amount of refrigerant in the A/C service station. |
| – |
Connect charging hose of A/C service station to vehicle
refrigerant circuit with quick-release coupling adapter. Refer
to vehicle-specific refrigerant circuit. |
| – |
Only tighten the handwheel on the quick-release coupling
adapter just enough so the valves in the service connections are
securely open. Do not put too much pressure on the valve. |
Note
| If pressure is to be measured after charging system on
vehicles with a service connection on one side of the
refrigerant circuit only, use valve adapter and charging hose
with valve opener . |
| – |
Initiate the vacuum phase on the A/C service station. The
refrigerant circuit is automatically evacuated. Check the preset
evacuating time if necessary. |
| When the vacuum phase ends, the refrigerant circuit leak
test begins. Pressure in bar (psi) and seconds are displayed. |
| Proceed as follows if the vacuum is not maintained: |
| – |
Initiate the vacuum phase on the A/C service station again.
The refrigerant circuit is automatically evacuated. Check the
preset evacuating time if necessary. Watch the vacuum indicator
for an extended period of time. Only when the vacuum is
maintained can the refrigerant circuit be charged. |
| If there is a leak that allowed enough air to enter during
evacuation that the A/C service station cannot generate a
sufficient vacuum or that the vacuum is lost immediately after
switching the A/C service station off: |
| – |
Determine the location of the leak in the refrigerant
circuit. Refer to
→ Chapter „Refrigerant Circuit, Detecting Leaks“. |
|
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:
Flushing Not Necessary
Note
For vehicles with an electrically-driven A/C compressor,
de-energize the high voltage system before removing the A/C
compressor. Refer to
→ Electrical System Hybrid; Rep. Gr.93.
–
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Discharge Refrigerant Circuit with A/C Service Station
Refrigerant Circuit with A/C Service Station, Filling