2015-2022 Volkswagen Touran 4 Door Air conditioning system -> 1.2.11 Expansion valve (with and without shut-off valve) User Manual
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Air conditioning system -> 1.2.11 Expansion valve (with and without shut-off valve) for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...  
Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017  
1.2.11  
Expansion valve (with and without shut-  
off valve)  
Expansion valve without shut-off function  
The expansion valve -A- atomises incoming refrigerant and reg‐  
ulates the flow so that, depending on the heat transport, the  
vapour does not become a gas until it reaches the outlet of the  
evaporator.  
Note  
♦ When R1234yf refrigerant was introduced, the expansion  
valves were adapted to the refrigerant (different characteris‐  
tics), hence the need to observe the correct version ⇒ Elec‐  
tronic parts catalogue .  
♦ Different versions of expansion valve due to different charac‐  
teristics that are matched to the relevant refrigerant circuit ⇒  
Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit (ve‐  
hicle-specific workshop manual) and ⇒ Electronic parts cata‐  
lk  
logue .  
♦ When renewing the expansion valve, make sure that the part  
number is correct ⇒ Electronic parts catalogue .  
♦ Depending on the version of air conditioner compressor, a  
valve may be installed on the high-pressure side that prevents  
liquefied refrigerant flowing back into the air conditioner com‐  
pressor after the air conditioning system is switched off. If an  
air conditioner compressor with this valve is installed in a ve‐  
hicle with a refrigerant circuit with expansion valve, it could  
take some time before the pressure on the high-pressure side  
drops (the expansion valve is cold and the pressure on the  
low-pressure side rises quickly after switching off, the expan‐  
sion valve closes and refrigerant only flows slowly on the low-  
pressure side). If the air conditioner compressor is switched  
on, the pressure on the low-pressure side drops, the expan‐  
sion valve opens and refrigerant can flow on the low-pressure  
side.  
Expansion valve with refrigerant shut-off valve  
Note  
Shut-off valves come in different versions, with different functions  
and different designations ⇒ Heating, air conditioning; Rep. gr.  
87 ; Refrigerant circuit (vehicle-specific workshop manual).  
48  
Rep. gr.87 - Air conditioning system  
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Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...  
Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017  
♦ The expansion valve -A- with shut-off valve -B- atomises the  
incoming refrigerant and regulates the flow rate of the refrig‐  
erant to the evaporator in the battery cooling module of the  
hybrid battery unit - AX1- in such a way that, depending on the  
heat transport, the vapour does not become a gas until it rea‐  
ches the outlet of the evaporator.  
♦ If the shut-off valve -B- is actuated by the electronics, it is open  
and allows refrigerant to flow through to the expansion valve  
-A-.  
♦ If the shut-off valve -B- is open, the expansion valve -A- allows  
refrigerant to flow through to the evaporator or heat exchanger  
based on its control characteristic ⇒ Heating, air conditioning;  
Rep. gr. 87 ; Refrigerant circuit .  
♦ The solenoid -B- attached to the expansion valve -A- is actu‐  
ated by different control units depending on the vehicle ⇒ Cur‐  
rent flow diagrams, Electrical fault finding and Fitting locations  
and ⇒ Vehicle diagnostic tester in “Guided Fault Finding”  
mode.  
♦ If, on a vehicle with 2 evaporators (one in the heater and air  
conditioner unit and one in the battery cooling module, e.g. the  
Audi Q5 Hybrid), the temperature measured at one evaporator  
meets the specification or falls below the specification, while  
on the other evaporator however the requisite specification is  
not reached, regulation works as follows: the battery regula‐  
lk  
tion control unit - J840- makes the electrical air conditioner  
compressor run at a higher speed via the power and control  
electronics for electric drive - JX1- and the control unit for air  
conditioning compressor - J842- (which results in the cooling  
output of the air conditioning system rising and pressure on  
the low pressure side falling along with the evaporator tem‐  
perature). If, as a result, the temperature at one evaporator  
falls below the specified level, -J840- actuates refrigerant shut-  
off valve 1 for hybrid battery - N516- or refrigerant shut-off  
valve 2 for hybrid battery - N517- in such a way that the evap‐  
orator - which is too cold - no longer has refrigerant flowing  
through it ⇒ Vehicle diagnostic tester in “Guided Fault Finding”  
mode.  
1. Refrigerant circuit  
49  
GETth  
Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...  
Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017  
1.2.12  
Refrigerant shut-off valves  
Shut-off valves with 2 switch statuses (open or closed)  
♦ Shut-off valves come in different versions, with different func‐  
tions and different designations ⇒ Heating, air conditioning;  
Rep. gr. 87 ; Refrigerant circuit .  
♦ If the shut-off valve -A- is not actuated by the electronics, it is  
open and allows refrigerant to flow through.  
♦ The shut-off valve -A- is installed on vehicles with high-voltage  
system, for example. It is actuated when no climate control is  
wanted for the passenger compartment but battery cooling is  
required for the hybrid battery unit - AX1- .  
♦ Note the arrow -B- on the shut-off valve -A-, which shows the  
direction of refrigerant flow (from condenser to evaporator in  
the heater and air conditioning unit).  
♦ The solenoid -C- attached to the shut-off valve -A- is actuated  
by different control units depending on the vehicle ⇒ Current  
flow diagrams, Electrical fault finding and Fitting locations and  
⇒ Vehicle diagnostic tester in “Guided Fault Finding” mode -  
air conditioning system and battery regulation.  
♦ If, on a vehicle with 2 evaporators (one in the heater and air  
conditioner unit and one in the battery cooling module, e.g. the  
Audi Q5 Hybrid), the temperature measured at one evaporator  
meets the specification or falls below the specification, while  
on the other evaporator however the requisite specification is  
not reached, regulation works as follows: the respective con‐  
trol unit makes the electrical air conditioner compressor run at  
a higher speed (which results in the cooling output of the air  
conditioning system rising and pressure on the low pressure  
side falling along with the evaporator temperature). If the tem‐  
perature at an evaporator then falls below the specified level,  
the respective control unit actuates the shut-off valve in such  
lk  
a way that the evaporator that is too cold no longer has refrig‐  
erant flowing through it ⇒ Heating, air conditioning; Rep. gr.  
87 ; Refrigerant circuit and ⇒ Vehicle diagnostic tester in “Gui‐  
ded Fault Finding” mode.  
Shut-off valves regulated via characteristic curves  
♦ The shut-off valve -A- is actuated via an incremental motor  
-B- by the respective control unit with characteristic curves  
(open or closed).  
♦ If the shut-off valve acts as a control valve (e.g. refrigerant  
expansion valve 1 - N636- as is the case with the Audi Q7), it  
is only opened enough to allow the temperature set for the heat  
exchanger to be reached ⇒ Heating, air conditioning; Rep. gr.  
87 ; Refrigerant circuit .  
♦ Shut-off valves actuated via incremental motors do not have  
a defined rest position. For this reason, they have to be set to  
a certain position (open or closed) before work on the refrig‐  
erant circuit is performed ⇒ Heating, air conditioning; Rep. gr.  
87 ; Refrigerant circuit .  
♦ Depending on layout of the refrigerant circuit there could be a  
cluster of shut-off valves forming a valve block (e.g. on the e-  
Golf or Audi Q7 e-tron) ⇒ Heating, air conditioning; Rep. gr.  
87 ; Refrigerant circuit .  
♦ The incremental motor is programmed and actuated via data  
lines (LIN-Bus) by the respective control unit in relation to its  
installation location ⇒ Heating, air conditioning; Rep. gr. 87 ;  
Refrigerant circuit and ⇒ Vehicle diagnostic tester in “Guided  
Fault Finding” mode.  
50  
Rep. gr.87 - Air conditioning system  
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Related Topics

Air conditioning system
1 Refrigerant circuit 1.1 System overview - refrigerant circuit 1.1.1 System overview - refrigerant circuit with expansion valve and receiver 1.1.2 System overview - refrigerant circuit with restrictor and reservoir 1.1.3 System overview - refrigerant circuit with electrically driven air conditioner compressor 1.2 General description - components of refrigerant circuit 1.2.1 Layout and function of refrigerant circuit 1.2.2 Mechanical air conditioner compressor 1.2.3 Electrical air conditioner compressor for hybrid vehicles 1.2.4 Condenser 1.2.5 Evaporator 1.2.6 Reservoir 1.2.7 Heat exchanger for heat pump mode 1.2.8 Liquid receiver 1.2.9 Restrictor 1.2.10 Receiver 1.2.12 Refrigerant shut-off valves 1.2.13 Refrigerant line with internal heat exchanger 1.2.14 Quick release couplings of refrigerant lines 1.2.15 Seals 1.2.16 Pipes and hoses in refrigerant circuit 1.2.17 High-pressure safety valve 1.2.18 Non-return valves 1.2.19 Quick-release coupling connections in refrigerant circuit 1.2.20 Connections with valve for switches in refrigerant circuit 1.2.21 Pressure senders and switches in refrigerant circuit 1.2.22 Refrigerant pressure and temperature sender 1.2.23 Air conditioner compressor regulating valve N280 1.2.24 Refrigerant temperature sender 1.3 Possible complaints 1.3.1 Prerequisites for investigating a complaint 1.3.2 Possible complaints 1.3.3 Odours from heater and air conditioner unit 1.4 Investigating leaks 1.4.1 General information about investigating leaks in the refrigerant circuit 1.4.2 Searching for leaks in refrigerant circuits using an electronic leak detector 1.4.3 Searching for leaks with UV leak detection system 1.4.4 Detecting leaks in a vacuum test using air conditioner service station, or in a pressure test 1.4.5 Detecting leaks in a pressure test (with nitrogen or compressed air) 1.5 Renewing components 1.5.1 General information about renewing components 1.5.2 Renewing leaking or damaged components of empty refrigerant circuit 1.5.3 Renewing leaking or damaged components of charged refrigerant circuit 1.5.4 Renewing air conditioner compressor with no need to clean refrigerant circuit 1.5.5 Renewing air conditioner compressor due to leaks or internal damage 1.5.6 Renewing desiccant cartridge / receiver after cleaning refrigerant circuit 1.5.7 Renewing receiver with no need to clean refrigerant circuit 1.5.8 Renewing desiccant cartridge / desiccant bag with no need to clean refrigerant circuit 1.6 Cleaning refrigerant circuit 1.6.1 General information about cleaning refrigerant circuit 1.6.2 Preparations for cleaning refrigerant circuit (flushing with R1234yf refrigerant) 1.6.3 Refrigerant circuit cleaning procedure 1.6.4 Principle circuit diagrams for cleaning (flushing circuits) - refrigerant circuit with expansion valve and receiver 1.6.5 Principle circuit diagrams for cleaning (flushing circuits) - refrigerant circuit with restrictor and receiver 1.6.6 Principle circuit diagrams for cleaning (flushing circuits) - vehicles with high-voltage system (without auxiliary) 1.6.7 Principle circuit diagrams for cleaning (flushing circuits) - vehicles with high-voltage system (with auxiliary) 1.6.8 Adapters for setting up flushing circuits 1.6.9 General information about blowing through with compressed air or nitrogen 1.6.10 Blowing through refrigerant circuit with compressed air or nitrogen 1.7 Checking pressures with pressure gauge 1.7.1 Display on pressure gauges 1.7.2 Pressure gauges enable the following test and measurement work 2 Working with air conditioner service station 2.1 Working with air conditioner service station 2.2 Connecting air conditioner service station to refrigerant circuit 2.3 Performing gas analysis of refrigerant 2.4 Emptying refrigerant circuit 2.5 Evacuating refrigerant circuit 2.6 Charging refrigerant circuit 2.7 Bringing air conditioning system into service after charging 2.8 Switching off air conditioner service station and separating from refrigerant circuit 2.9 Charging refrigerant in reservoir 2.10 Emptying air conditioner service station 2.11 Cleaning electrical air conditioning compressor 2.12 Cleaning refrigerant circuit 2.13 Filling contaminated refrigerant in a recycling cylinder for analysis, processing or disposal 2.13.1 Filling contaminated refrigerant in a recycling cylinder using technical equipment 2.13.2 Filling undercooled contaminated refrigerant in a recycling cylinder 2.14 Checking pressures 2.14.1 General information on checking pressures in the refrigerant circuit 2.14.2 Pressures and temperatures in refrigerant circuit 2.14.3 Checking pressures in the refrigerant circuit with the ignition switched off 2.14.4 Checking pressures with air conditioning system switched on - vehicles with mechanical air conditioning compressor 2.14.5 Checking pressures with air conditioning system switched on - vehicles with electrical air conditioning compressor 3 Testing equipment and tools 3.1 Tools and materials available from distribution centre or importer 3.2 Tools and materials available commercially 3.3 Tools that can be locally manufactured

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