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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
Senders for connection to a refrigerant circuit with valve
Note
♦ Refer to vehicle-specific refrigerant circuit for switching pres‐
sures, removing and installing switches and location/design of
switches ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant
circuit (vehicle-specific workshop manual).
♦ These senders come in different versions, with different func‐
tions and different designations. The refrigerant pressure and
temperature sender - G395- shown as follows is installed e.g.
in the Golf GTE, Audi A4, Audi Q5 and Audi Q5 Hybrid ⇒
Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit;
System overview - refrigerant circuit .
♦ Before loosening the threaded connection of the sender,
check which version of sender it is ⇒ Heating, air conditioning;
Rep. gr. 87 ; Refrigerant circuit; System overview - refrigerant
circuit .
♦ For senders designed for connection to a refrigerant circuit
without valve. The refrigerant must be extracted before the
threaded connection is loosened. If the sender is not removed
within 10 minutes after the system has been evacuated, pres‐
sure may develop in the refrigerant circuit due to re-evapora‐
tion. Extract refrigerant again.
♦ Different designations depending on the function and vehicle
lk
⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit;
System overview - refrigerant circuit .
♦ The sender for refrigerant pressure and refrigerant tempera‐
ture is installed e.g. in place of the high pressure sender or
pressure sender for refrigerant circuit ⇒ Heating, air condi‐
tioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-specific work‐
shop manual)
♦ The sender for refrigerant pressure and refrigerant tempera‐
ture, the pressure sender for refrigerant circuit and high pres‐
sure sender come in different versions. Depending on the
version, they can currently only be distinguished externally by
the part number, which is why attention should be paid during
renewal to their correct allocation (part number ⇒ Electronic
parts catalogue ). Reason: These senders emit different sig‐
nals, and the relevant control units can only evaluate the signal
to which they have been matched ⇒ Vehicle diagnostic tester
in “Guided Fault Finding” mode - air conditioning system and
⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit
(vehicle-specific workshop manual).
♦ The sender for refrigerant pressure and refrigerant tempera‐
ture (and the pressure sender for refrigerant circuit) exchange
information with the respective control unit via the data bus
(e.g. “LIN bus”) when voltage is applied. The respective control
units use this information to calculate the pressure and tem‐
perature in the refrigerant circuit. Any faults detected in this
way are passed on to the control unit ⇒ Vehicle diagnostic
tester in “Guided Fault Finding” mode.
♦ The sender for refrigerant pressure and refrigerant tempera‐
ture transmits the measured valve for the pressure in the
refrigerant circuit and the measured temperature to the con‐
nected control unit. The pressure sender for refrigerant circuit
only transmits the measured value for the pressure in the re‐
frigerant circuit to the connected control unit. Even though on
most vehicles only the pressure signal is evaluated, no other
pressure sender may be installed in a vehicle for which provi‐
sion is made for a refrigerant pressure and refrigerant tem‐
perature sender ⇒ Electronic parts catalogue .
1. Refrigerant circuit
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