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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
Note
On vehicles with high-voltage system and auxiliary air condition‐
ing system functions (“heat pump mode” or “cooling of high-
voltage battery”), valves may be installed in the refrigerant circuit
that are not open when de-energised. These valves are opened
and closed e.g. via incremental motors and are no longer actu‐
ated when the ignition is switched off. To completely empty,
correctly evacuate and charge the refrigerant circuit, however, no
areas may be isolated. Therefore, these valves must be opened
before these measures are carried out. On completion of the
work, enable actuation of these valves again via the respective
control unit ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant
circuit (vehicle-specific workshop manual) and ⇒ Vehicle diag‐
nostic tester in “Guided Fault Finding” mode.
All vehicles
If it is necessary to perform a function check after charging the
refrigerant circuit:
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– Check the pressures in the refrigerant circuit ⇒ page 170 .
If it is not necessary to perform a function check after charging
the refrigerant circuit:
– Detach the air conditioner service station from the refrigerant
circuit and switch off
⇒ “2.8 Switching off air conditioner service station and sepa‐
rating from refrigerant circuit”, page 151 .
2.7
Bringing air conditioning system into
service after charging
Note
♦ If the mechanical air conditioner compressor was removed,
turn it approx. 10 times by hand before initial operation (during
installation or after installation e.g. before fitting the belt) so
that no damage is caused from a fluid shock when it is switch‐
ed on the first time (if there is refrigerant oil in the cylinder of
the air conditioner compressor, this will be forced out by turn‐
ing) ⇒ Heating, air conditioning; Rep. gr. 87 ; Air conditioner
compressor; Removing and installing air conditioner compres‐
sor .
♦ If the electrical air conditioner compressor was removed, be‐
fore bringing the air conditioning system into operation for the
first time and after charging, the air conditioner compressor is
to be brought into operation via the “Basic setting, compressor
run-in” function in guided fault finding ⇒ Vehicle diagnostic
tester in “Guided Fault Finding” mode - air conditioning system
and battery regulation. This prevents damage to the air con‐
ditioner compressor, e.g. from a fluid shock, during initial
activation (if there is refrigerant oil in the compression cham‐
ber of the air conditioner compressor, this will be forced out).
♦ The mechanical air conditioner compressor is driven by the
engine via a belt or a shaft. The electrical air conditioner com‐
pressor is driven by an electric motor mounted directly on the
air conditioner compressor (e.g. on vehicles with hybrid drive)
⇒ Heating, air conditioning; Rep. gr. 87 ; Air conditioner com‐
pressor; Removing and installing air conditioner compressor .
2. Working with air conditioner service station
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