Volkswagen Polo Service & Repair Manual: 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. |
| – |
Discharge the refrigerant circuit. |
| – |
Remove the A/C compressor. |
Note
| If a different A/C compressor is installed with a different
refrigerant oil, the refrigerant circuit is to be flushed with
refrigerant R134a. Refer to
→ Chapter „Refrigerant Circuit, Flushing (Cleaning) with
Refrigerant R134a“. |
| Electrically-driven A/C compressor: |
| If an electrically-driven A/C compressor is being replaced
that does not have a mechanical fault (for example, a faulty
circuit board), then determine how much refrigerant is in this
A/C compressor. |
Note
| This A/C compressor must be flushed to get all the
refrigerant oil out.
|
| The A/C compressor is flushed in the flow direction (from
the low pressure side input to the high pressure side output) |
| So that as much refrigerant oil as possible is flushed out
of the A/C compressor, the A/C compressor must be positioned so
that the high pressure side output is as low as possible. |
| If an A/C service station without a flushing program is
used, the procedure must be performed manually (evacuate, flush
3 times with at least 2 kg refrigerant each and extract
refrigerant again, evacuate). |
| Quantity: for example 50 cm³ |
| Pour so much refrigerant oil out of the new A/C compressor
so that only the amount remains (plus 10 cm
3) that had been flushed out of the
old A/C compressor beforehand. If the new original A/C
compressor has for example, 200 cm3,
then only pour out 140 cm3. |
| – |
Pour old refrigerant oil out of A/C compressor. Handling
refrigerant oil. |
Note
| In not enough refrigerant oil can be poured out from the A/C
compressor to be installed, flush the new A/C compressor. After
flushing, fill the A/C compressor to be installed with as much
new refrigerant oil as was flushed from the replaced A/C
compressor. |
| Mechanically Driven A/C Compressor: |
| – |
Remove oil drain plug from A/C compressor. |
| – |
To accelerate drainage of refrigerant oil, rotate compressor
e.g. by way of ribbed belt pulley/clutch plate of A/C clutch for
example. Does not apply to the electrically-driven A/C
compressor. |
| – |
Pour old refrigerant oil out of A/C compressor. Handling
refrigerant oil. |
| – |
Remove oil drain plug from original part compressor, pour
out refrigerant oil and only add a quantity of fresh refrigerant
oil equal to the amount poured out of the malfunctioning
compressor. |
Note
| If, for example, 70 cm3 of
refrigerant oil has been poured out of the malfunctioning A/C
compressor and 220 cm3 out of the
original part A/C compressor (a small quantity of refrigerant
oil remains in the A/C compressor). Fill the compressor to be
installed with 70 cm 3 of
refrigerant oil (use can be made of oil poured out of original
part compressor). |
| Use different refrigerant oils and quantities for the
various compressors. Refer to
→ Rep. Gr.87. |
| If a greater quantity of refrigerant oil (more than
approximately 80 cm3) has been
poured out of the malfunctioning compressor, the remaining
refrigerant oil can also be added to the evaporator or
reservoir/receiver/dryer. Refer to
→ Rep. Gr.87. |
| – |
Replace the restrictor depending on the vehicle. |
| – |
Assemble, evacuate and charge the refrigerant circuit. |
|
Note
For vehicles with an electrically-driven A/C compressor,
de-energize the high voltage system before removing the A/C
compressor. Refer to
&# ...
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Leaks or Internal Damage, for Example Noises or No Output