Volkswagen Golf Service & Repair Manual: Basics for working on refrigerant circuit
| Observe instructions specific to the workplace;
→ Volkswagen ServiceNet; Handbooks; Service handbook;
Environmental protection. Refrigerant from air
conditioning systems / refrigerant oils - to be displayed at
refrigerant designated working area. |
| Observe the utmost cleanliness when working. |
| When handling refrigerants and nitrogen, wear protective
clothing, protective glasses and protective gloves. |
| Switch on exhaust gas fume extractor (if there is one). |
| Extract the refrigerant circuit using only the air
conditioner service station, and only then loosen the threaded
joints and renew the defective components. |
| Protect units and hoses against moisture and dirt using
sealing caps. |
| Use only tools and materials that are intended for use with
refrigerant R134a. |
| Protect refrigerant oil by sealing container to prevent
ingress of moisture. |
| – |
Blow through refrigerant circuit with compressed air and
nitrogen
→ Chapter: |
| – |
Purge refrigerant circuit with refrigerant R134a.
→ Chapter |
| In vehicles that have an air conditioner compressor without
a magnetic clutch: |
 Note
| If the engine is being started for the first time after the
refrigerant circuit has been reassembled. |
| If possible, start engine only with refrigerant circuit
charged. |
| The air conditioner compressor is driven permanently by the
poly V-belt pulley or elastic drive coupling (it is not fitted
with a magnetic clutch). |
| If an air conditioner compressor seizes, the overload
protection separates from the air conditioner compressor shaft.
Even if no bulges are visible in the V-belt pulley or overload
protection, it may be that the air conditioner compressor has
seized. Another indication is abraded rubber material around the
poly V-belt pulley or overload protection. |
| The air conditioner compressor has an internal oil circuit
to ensure that the air conditioner compressor is not damaged
when the refrigerant circuit is empty. This means that about 40
to 50 cm3 refrigerant oil remain in
the air conditioner compressor. |
| The engine may be started only when the refrigerant circuit
is properly assembled. If, for example, the refrigerant lines
are not connected to the air conditioner compressor and the
engine is running, the compressor may heat up so much through
internal warming that it will be destroyed. |
| The air conditioner compressor regulating valve -N280- is
not activated when the refrigerant circuit is empty and the air
conditioner compressor idles with the engine. |
| If it is necessary to start engine with an empty refrigerant
circuit: |
| The refrigerant circuit must be fully assembled. |
| At least ј of the quantity of refrigerant oil specified for
this refrigerant circuit must be in the air conditioner
compressor. |
| The engine speed must not exceed 2000 rpm. |
| The engine should run < 10 minutes. |
|
|
|
Air conditioning service station -VAS 6007A- (and further
service stations currently available)
→ Workshop equipment
...
Use only O-rings that are resistant to refrigerant R134a and
related refrigerant oils. O-rings are no longer colour-coded.
Coloured and black O-rings are used.
...
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Safety precautions for when working on vehicles with air conditioning and
when handling refrigerant R134a
O-ring