Volkswagen Polo Service & Repair Manual: A/C Service Station, Connecting for Measuring and Testing
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. |
| Work procedure may vary depending on the type of tools
selected (the tool-specific operating instructions should
therefore be followed). |
Note
| The work procedure is always to be performed as described in
the operating instructions for the A/C Service Station
-VAS6007A- (or subsequent models). |
| The charging hoses are to be connected as follows to prevent
the ingress of air or moisture into the refrigerant circuit: |
| – |
Connect the A/C service station to the power supply. |
| – |
Remove the cap from the service connections or connections
with a valve (see vehicle-specific refrigerant circuit). |
| – |
Evacuate the filler hose. |
Note
| Connect filler hose with quick-release couplings to
refrigerant circuit service connections. |
Caution
| Never open valves on low or high-pressure side with
engine running. Otherwise, compressor or service station
could be destroyed by a “short circuit” between high and
low-pressure sides of refrigerant circuit if air
conditioning system is switched on. |
|
| – |
Only tighten the handwheel in the quick-release coupling
just enough so the service connection is open. Watch the
pressure gauge and do not place too much pressure on the valve. |
| – |
Start the engine and perform the planned tests and
measurements. |
| – |
Compare values determined to specified measured values.
Refer to
→ Chapter „Refrigerant Circuit Pressures (with A/C Service
Station), Checking“. |
| – |
Loosen the handwheel to close the quick-release coupling
before disconnecting it. |
|
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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Important Information when Working with the A/C Service Station
Discharge Refrigerant Circuit with A/C Service Station