2015-2022 Volkswagen Touran 4 Door Air conditioning system -> 1.4.1 General information about investigating leaks in the refrigerant circuit User Manual
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Air conditioning system -> 1.4.1 General information about investigating leaks in the refrigerant circuit for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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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  
1.4  
Investigating leaks  
⇒ “1.4.1 General information about investigating leaks in the re‐  
frigerant circuit”, page 68  
⇒ “1.4.2 Searching for leaks in refrigerant circuits using an elec‐  
tronic leak detector”, page 69  
⇒ “1.4.3 Searching for leaks with UV leak detection system”, page  
71  
⇒ “1.4.4 Detecting leaks in a vacuum test using air conditioner  
service station , or in a pressure test”, page 77  
⇒ “1.4.5 Detecting leaks in a pressure test (with nitrogen or com‐  
pressed air)”, page 77  
1.4.1  
General information about investigating  
leaks in the refrigerant circuit  
Note  
♦ Small leaks can be detected with e.g. an electronic leak de‐  
tector or a UV leak detector lamp.  
♦ This workshop manual describes 2 ways of tracing leaks in  
refrigerant circuits. These procedures have been tested and  
lead to a reliable result under the different usage conditions if  
they are performed correctly and in accordance with the spe‐  
cific complaint.  
♦ Various methods are offered in the open market with which  
leaks in refrigerant circuits can be traced. These methods are  
not able to provide clear results in all cases and, unless the  
exact procedure is adhered to, they can also result in various  
components of the refrigerant circuit being identified as having  
leaks even though they do not. Furthermore, certain process‐  
es can cause preliminary or permanent damage to the com‐  
ponents of the refrigerant circuit  
♦ Components that are found to be leaking must not be repaired.  
They must be renewed instead.  
♦ A leaking refrigerant circuit must not be charged with refriger‐  
ant. Therefore, evacuate an empty refrigerant circuit and  
check for leaks before charging the system with refrigerant  
⇒ “2.5 Evacuating refrigerant circuit”, page 140 .  
68  
Rep. gr.87 - Air conditioning system  
GETth  
Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...  
Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017  
Note  
♦ VW/Volkswagen/Audi does not endorse the use of chemical  
substances (leak inhibitor additives) for purposes of sealing  
leaks in refrigerant circuits.  
♦ Chemical substances used to seal leaks form deposits in the  
refrigerant circuit. These can impair the function of the air con‐  
ditioning system and cause the air conditioning system (and  
your air conditioner service station ) to fail.  
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♦ These chemical substances (leak stop additives) react mostly  
with the ambient air or the humidity to stop leaks in the refrig‐  
erant circuit. They cause deposits to build up in the refrigerant  
circuit (and your air conditioner service station ), cause valves  
to malfunction and defects in other components with which  
they come into contact. These deposits cannot be completely  
removed from the components (not even by cleaning/flush‐  
ing). The refrigerant circuit can only be repaired by replacing  
all components that have come into contact with this sub‐  
stance.  
1.4.2  
Searching for leaks in refrigerant circuits  
using an electronic leak detector  
Special tools and workshop equipment required  
♦ Electronic leak detector or proprietary device  
Note  
♦ Leaks in R1234yf refrigerant circuits can only be found using  
electronic leak detection devices designed for R1234yf refrig‐  
erant.  
♦ The various refrigerants have a different molecular structure.  
The sensors of electronic leak detection devices are adapted  
to these molecules. If an electronic leak detection device is  
used that is not designed for R1234yf refrigerant, it will not  
respond to R1234yf refrigerant at all or only in larger concen‐  
trations in the vicinity of the leak. For this reason, electronic  
leak detection devices designed only for R134a refrigerant  
cannot be used for leak detection in the R1234yf refrigerant  
circuit.  
♦ Depending on the type of heater and air conditioner unit, a leak  
from the evaporator can be investigated by holding the test  
probe of the leak detector against the glove compartment  
cooler connection in the heater and air conditioner unit, or by  
holding the test probe against the open condensation drain  
connection of the heater and air conditioner unit with the con‐  
densation drain hose pulled off.  
Performing leak detection on a completely empty refrigerant cir‐  
cuit caused by a leak:  
Note  
With a completely empty refrigerant circuit, proceed as follows to  
ensure that no more refrigerant than necessary enters the envi‐  
ronment during testing:  
– Evacuate refrigerant circuit using air conditioner service sta‐  
tion ⇒ “2.5 Evacuating refrigerant circuit”, page 140 .  
1. Refrigerant circuit  
69  
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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 1.2.11 Expansion valve (with and without shut-off valve) 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 1.4.2 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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