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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
Bringing air conditioning system with mechanical air conditioning
compressor into operation
– Switch on ignition.
– Set the air conditioning system to the lowest output possible
(e.g. select operating mode “A/C OFF”).
– Switch off actuation of the air conditioner compressor (e.g.
select operating mode “A/C OFF”).
– Start the engine with the air conditioner compressor switched
off (e.g. operating mode “A/C OFF” selected).
– Wait until idling speed has stabilised:
– Switch air conditioner compressor on and let system run for at
least 2 minutes with engine idling.
– If necessary, check the pressures in the refrigerant circuit us‐
ing the air conditioner service station ⇒ page 129 .
– Switch off engine.
– 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 .
Bringing air conditioning system with electrical air conditioning
compressor into operation
– Switch on ignition.
– Bring the air conditioner compressor into operation via the
“Basic settings, compressor run-in” function of guided fault
finding ⇒ Vehicle diagnostic tester in “Guided Fault Finding”
mode - air conditioning system and battery regulation.
In addition for vehicles with electrically-actuated valves in the re‐
frigerant circuit that are not open when de-energised:
– Use the vehicle diagnostic tester to enable (open or close) the
electrically-actuated valves - that are not open when de-ener‐
gised - for operation of the air conditioning system via the
respective control unit ⇒ Vehicle diagnostic tester in “Guided
Fault Finding” mode.
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; System overview - refrigerant circuit and ⇒ Vehicle diag‐
nostic tester in “Guided Fault Finding” mode.
All air conditioning systems with electrical air conditioning com‐
pressor
– After the basic setting, check the pressures in the refrigerant
circuit if necessary using the air conditioner service station .
– On vehicles with high-voltage system, switch off “stationary air
conditioning” function (deactivate)⇒ Owner's Manual .
150
Rep. gr.87 - Air conditioning system
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