Before servicing the air conditioning system on any vehicle, please be sure to read all of the following precautions, which deal with personal safety, prevention of component damage, and important points to take into consideration when servicing the air conditioning system:
When removing refrigerant components from a vehicle, immediately cap (seal) the component to
minimize the entry of moisture from the atmosphere.
When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just
before connecting the components. Connect all refrigerant loop components as quickly as possible
to minimize the entry of moisture into system.
Only use the specified lubricant from a sealed container. Immediately reseal containers of lubricant.
Without proper sealing, lubricant will become moisture saturated and should not be used.
Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from the A/C system, using certified service equipment meeting
requirements of SAE J2210 HFC-134a (R-134a) recycling equipment, or J2209 HFC-134a
(R-134a) recovery equipment. If accidental system discharge occurs, ventilate work area before
resuming service. Additional health and safety information may be obtained from refrigerant and
Do not allow lubricant to come in contact with styrofoam parts. Damage may result.
Note the following when working with an A/C service station:
Thoroughly read over the workshop equipment catalog and parts catalog
A certain quantity of refrigerant is specified as charge for each air conditioning system. To ensure that neither too much nor too little refrigerant is added (either would reduce the cooling output), the charging cylinder stands on a scale indicating the weight.
The filters and dryers installed must be replaced at the latest on completion of the service life specified in the relevant operating instructions.
Only refrigerant oils that are approved for the vehicle-specific refrigerant system may be used.
Extracted refrigerant must NEVER be reused under the following conditions, even after cleaning in the station:
A/C compressor damage in which the refrigerant was disintegrated due to overheating.
Dark, sticky deposits in the refrigerant circuit (these can only be found after opening the system).
If there is any doubt as to the composition of the refrigerant extracted from the refrigerant circuit.
The A/C service station is to be drained in all these cases, outlined under Discharging the System, the system cleaned if necessary and the filters, dryers and refrigerant oil replaced.
Contaminated refrigerant must be recycled according to Federal or local regulations.
Commercially available A/C service stations can be classified in 2 groups:
A. A/C service stations which clean extracted refrigerant for re-use (so-called extraction and recycling stations), e.g. A/C service station VAS 6007A .
B. A/C service stations which transfer extracted refrigerant to recycling containers (for large-scale recycling). These are referred to as extraction systems.