Audi Q5: Compressor, Replacing without the Need for Flushing Refrigerant Circuit
Note
- Cleaning the refrigerant circuit means flushing with
refrigerant R134a. Refer to
→ Chapter "Refrigerant Circuit, Cleaning (Flushing), with
Refrigerant R134a".
- If a faulty A/C compressor is replaced with an A/C
compressor from another manufacturer check for the A/C
compressor to be installed has the same refrigerant oil approved
which is already in the refrigerant circuit (from the removed
A/C compressor). If a different refrigerant oil is approved for
the A/C compressor to be installed then the A/C compressor which
was removed, the refrigerant circuit must be flushed. Refer to
→ Chapter "Approved Refrigerant Oils".
For example, in the event of external damage following an
accident (or for an electrical fault).
- Discharge the refrigerant circuit.
- Remove the A/C compressor. Refer to
→ Heating, Ventilation and Air Conditioning; Rep. Gr.87; A/C
Compressor (vehicle-specific repair manual).
Note
Use different refrigerant oils and quantities for the
various compressors. Refer to
→ Chapter "Refrigerant Oil Capacities".
Electrically-Driven A/C compressor
- When and electrically driven A/C compressor is replaced
determine the amount of refrigerant oil found in the removed A/C
compressor by flushing. Refer to
→ Chapter "Electrically Driven A/C Compressor, Rinsing (Remove
Refrigerant Oil)". Pour the refrigerant oil out of
the A/C compressor to be installed so that only the amount or
refrigerant oil remains in the A/C compressor as the amount
flushed out of the removed A/C compressor. Refer to
→ Chapter "Refrigerant Oil Capacities".
Example:
- From the A/C compressor to be replaced 120 cm3
is flushed. Refer to
→ Chapter "Electrically Driven A/C Compressor, Rinsing (Remove
Refrigerant Oil)".
- In the A/C compressor to be installed there are 200 cm3
refrigerant oil. Refer to the data plate and
→ Chapter "Refrigerant Oil Capacities".
- Tip out from the new A/C compressor (next over the
connection for the refrigerant pipe low pressure side) enough
refrigerant that only the amount of refrigerant oil (plus 10 cm3)
remains in it, as before the replaced A/C compressor was flushed
out. An example is 110 cm3
refrigerant oil (this will insure that the refrigerant oil
quantity in the refrigerant circuit after installing is
correct).
Note
- Electrically driven A/C compressors cannot have the
refrigerant oil poured out in the same manner as a mechanically
driven A/C compressor. There is no drain plug, the A/C
compression cannot be turned and because it is installed inside
defending on the version only a specialized part or no
refrigerant oil can be poured out. (Due to the different
distribution of refrigerant oil in the A/C compressor). Usually
a residual amount between 30 and 80 cm3
remains in the A/C compressor when pouring out. For this reason,
the removed A/C compressor is to be flushed to remove the
refrigerant oil and to determine the amount of refrigerant oil,
depending on the complaint. Refer to
→ Chapter "Electrically Driven A/C Compressor, Rinsing (Remove
Refrigerant Oil)".
- If the recommended amount of refrigerant oil cannot be
poured out of the A/C compressor to be installed if necessary
the new A/C compressor to be installed may be flushed. In the
new A/C compressor as much refrigerant oil the amount is to be
filled as was flushed out of the old A/C compressor. Refer to
→ Chapter "Electrically Driven A/C Compressor, Rinsing (Remove
Refrigerant Oil)".
- At room temperature the refrigerant oil had approximately
the same density as water (1 kg equals a liter).
- Also electrical A/C compressors of the same version (same
manufacturer, same part number) mostly do not have the same
weight so that the amount of refrigerant oil contained cannot be
determined by weighing (the tolerances are too large, to
determine the amount of refrigerant oil contained via the
weight).
- Depending on the construction and the storage of the A/C
compressor the refrigerant oil separated unevenly in the A/C
compressor. One part can be located in the compression chamber
and another in the area of the electronic motor, so that here
the refrigerant oil must be alternately poured out via both
connections for the refrigerant lines (high and low pressure
side). While doing this arrange the A/C compressor so that the
relevant connection is as far downward as possible.
- Dispose of the refrigerant oil removed from the defective
and the new A/C compressor and poured out refrigerant oil from
the new A/C compressor which is no longer necessary. Pay
attention to local regulations.
Mechanically Driven A/C Compressor
- Remove the drain plug from the A/C compressor (mechanically
driven A/C compressor).
Note
There are different versions of the oil drain plug and its
seal (it can be either an O-ring or a gasket; always replace).
Refer to
→ Chapter "Leaking or Damaged Components except A/C Compressor,
Reservoir or Receiver/Dryer" and to the Parts
Catalog.
- To accelerate drainage of refrigerant oil, rotate the A/C
compressor by way of clutch plate of A/C clutch, for example.
- Drain the old refrigerant oil from the A/C compressor and
dispose. Pay attention to local regulations.
- Remove the oil drain plug from replacement A/C compressor,
pour out refrigerant oil in a clean container and only add a
quantity of fresh refrigerant oil equal to the amount poured out
of the malfunctioning A/C compressor.
Caution
There is a risk of damaging the A/C compressor with
dirty refrigerant oil.
- Refrigerant oil that is poured out from the new A/C
compressor can only be reused when it is located in a
clean container and the necessary amount after pour out
is refilled in the A/C compressor.
- Do not reuse refrigerant oil when it is dirty or
there is moisture, this is to be disposed of.
Note
- If, for example, 70 cm3 of
refrigerant oil has been poured out of the defective A/C
compressor and 220 cm 3 out of the
replacement A/C compressor (a small quantity of refrigerant oil
remains in the A/C compressor). In this case fill the A/C
compressor that is to be installed with 70 cm
3 refrigerant oil. The refrigerant
oil that was poured out of the new (replacement) A/C compressor
can be reused, if there is no dirt of moisture in it.
- Use different refrigerant oils and quantities for the
various compressors. Refer to
→ Chapter "Refrigerant R134a Capacities, Refrigerant Oil and
Approved Refrigerant Oils".
- If a greater quantity of refrigerant oil (more than
approximately 40 cm 3) has been
poured out of the malfunctioning compressor, the remaining
refrigerant oil can also be added to the evaporator or
receiver/dryer. Refer to
→ Chapter "Refrigerant R134a Capacities, Refrigerant Oil and
Approved Refrigerant Oils".
All
- Replace the restrictor (only if there is one in this
refrigerant circuit).
- Assemble, evacuate and charge the refrigerant circuit.
READ NEXT:
Vehicles with a High Voltage System (Hybrid Vehicles)
Extremely Dangerous Due to High-Voltage
The high-voltage system is under high-voltage. Death or serious
bodily injury by electric shock.
- I
Note
Cleaning the refrigerant circuit means flushing it with
refrigerant R134a. Refer to
→ Chapter "Refrigerant Circuit, Cleaning (Flushing), with
Refrigerant R134a" or blowing throu
Note
Certain functions on the A/C Compressor Regulator Valve
-N280- (for example, a stuck valve or a disruption in the coil)
can lead to a complaint regarding the A/C compressor (A/C syste
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