2015-2022 Volkswagen Touran 4 Door Air conditioning system -> 1.6.1 General information about cleaning refrigerant circuit User Manual
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Air conditioning system -> 1.6.1 General information about cleaning refrigerant circuit 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  
Note  
♦ In the event of internal damage (to the air conditioner com‐  
pressor), check the refrigerant hoses and condenser. If con‐  
taminated by swarf, for example, clean ltkhe refrigerant hoses  
and condenser (flush with R1234yf refrigerant  
⇒ “1.6 Cleaning refrigerant circuit”, page 92 ); renew refrig‐  
erant hoses if necessary.  
♦ On certain vehicles (e.g. vehicles with 2 evaporators), the vol‐  
ume of refrigerant oil in the refrigerant circuit may be greater  
than the volume in the replacement air conditioner compres‐  
sor. Replenish the refrigerant circuit on these vehicles with the  
amount of refrigerant oil necessary ⇒ Heating, air condition‐  
ing; Rep. gr. 00 ; Technical data (vehicle-specific workshop  
manual).  
♦ In the event of a fault in the electronics of an electrical air con‐  
ditioning compressor (e.g. control unit for air conditioning com‐  
pressor - J842- defective), the refrigerant circuit need not be  
flushed. In this case, the air conditioner compressor is to be  
renewed without there being a requirement to clean the re‐  
frigerant circuit  
⇒ “1.5.4 Renewing air conditioner compressor with no need to  
clean refrigerant circuit”, page 85  
– Renew desiccant bag/desiccant cartridge (reservoir/receiver)  
⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit;  
System overview - refrigerant circuit .  
– Check expansion valve for contamination or corrosion, renew  
if necessary ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrig‐  
erant circuit; System overview - refrigerant circuit .  
– Assemble the refrigerant circuit, evacuate and charge  
⇒ page 129 .  
1.5.6  
Renewing desiccant cartridge / receiver  
after cleaning refrigerant circuit  
Note  
Installed in the receiver is usually a desiccant cartridge or desic‐  
cant bag (depending on the layout of the refrigerant circuit) ⇒  
Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit; System  
overview - refrigerant circuit  
♦ Observe the general information about renewing components  
⇒ “1.5.1 General information about renewing components”,  
page 79  
Note  
Clean the refrigerant circuit. In other words, flush with R1234yf  
refrigerant ⇒ “1.6 Cleaning refrigerant circuit”, page 92 .  
For example due to moisture ingress (the refrigerant circuit was  
open for too long) or contamination  
– Drain refrigerant circuit ⇒ page 129 .  
– Remove air conditioner compressor ⇒ Heating, air condition‐  
ing; Rep. gr. 87 ; Air conditioner compressor .  
88  
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  
– Rectify cause of fault ⇒ Heating, air conditioning; Rep. gr. 87 ;  
Refrigerant circuit; System overview - refrigerant circuit .  
– Clean refrigerant circuit (flush with R1234yf refrigerant)  
⇒ “1.6 Cleaning refrigerant circuit”, page 92 .  
lk  
Electrical air conditioner compressor  
– Flush air conditioner compressor of old refrigerant oil  
⇒ “2.11 Cleaning electrical air conditioning compressor”, page  
155 .  
Mechanical air conditioner compressor  
– Remove oil drain plug from air conditioner compressor ⇒  
Heating, air conditioning; Rep. gr. 87 ; Air conditioner com‐  
pressor .  
Note  
Different versions of oil drain plug and corresponding seal, renew  
⇒ “1.5.2 Renewing leaking or damaged components of empty re‐  
frigerant circuit (apart from air conditioner compressor and re‐  
ceiver)”, page 81 , ⇒ Heating, air conditioning; Rep. gr. 87 ;  
Refrigerant circuit; System overview - refrigerant circuit (vehicle-  
specific workshop manual) and ⇒ Electronic parts catalogue .  
– To speed up draining of the refrigerant oil, rotate the shaft of  
the air conditioner compressor e.g. using the belt pulley or the  
magnetic clutch pulley ⇒ Heating, air conditioning; Rep. gr.  
87 ; Air conditioner compressor .  
– Pour out old refrigerant oil from air conditioner compressor  
⇒ “1.5.4 Renewing air conditioner compressor with no need to  
clean refrigerant circuit”, page 85 .  
Note  
Dispose of old refrigerant oil (observing local regulations) ⇒ VW /  
Audi ServiceNet .  
All air conditioner compressors  
– Check expansion valve for contamination or corrosion, renew  
if necessary ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrig‐  
erant circuit; System overview - refrigerant circuit .  
– Then fill the air conditioner compressor with new refrigerant oil  
by the same amount of refrigerant oil filled in the replacement  
air conditioner compressor (or by the specified amount of re‐  
frigerant oil if the vehicle is fitted with 2 evaporators) ⇒  
Heating, air conditioning; Rep. gr. 00 ; Technical data; Re‐  
frigerant oil .  
1. Refrigerant circuit  
89  
GETth  
Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...  
Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017  
Note  
♦ Different refrigerant oils and volumes for different air condi‐  
tioner compressors ⇒ Heating, air conditioning; Rep. gr. 00 ;  
Technical data (vehicle-specific workshop manual).  
♦ To ensure proper lubrication of the air conditioner compressor  
when it runs for the first time, the air conditioner compressor  
must be filled with at least 40 cm3 of refrigerant oil; the re‐  
mainder can be poured e.g. into a refrigerant line or the new  
reservoir/receiver/inner heat exchanger  
⇒ “1.5.1 General information about renewing components”,  
page 79 , ⇒ Heating, air conditioning; Rep. gr. 00 ; Technical  
data .  
♦ If dirt enters the air conditioner compressor while the refriger‐  
ant circuit is open (e.g. after an accident), the refrigerant circuit  
must be cleaned and the air conditioner compressor renewed  
⇒ “1.6 Cleaning refrigerant circuit”, page 92 and ⇒ Heating,  
air conditioning; Rep. gr. 87 ; Air conditioner compressor .  
♦ On vehicles with 2 evaporators, the volume of refrigerant oil in  
the refrigerant circuit may be greater than the volume in the  
replacement air conditioner compressor. Replenish the refrig‐  
erant circuit with the amount of refrigerant oil necessary ⇒  
Heating, air conditioning; Rep. gr. 00 ; Technical data (vehicle-  
specific workshop manual).  
lk  
– Renew desiccant bag/desiccant cartridge (receiver) ⇒ Heat‐  
ing, air conditioning; Rep. gr. 87 ; Refrigerant circuit; System  
overview - refrigerant circuit .  
– Assemble the refrigerant circuit, evacuate and charge  
⇒ page 129 .  
1.5.7  
Renewing receiver with no need to clean  
refrigerant circuit  
Note  
Installed in the receiver is usually a desiccant cartridge or desic‐  
cant bag (depending on the layout of the refrigerant circuit) ⇒  
Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit; System  
overview - refrigerant circuit  
♦ Observe the general information about renewing components  
⇒ “1.5.1 General information about renewing components”,  
page 79  
Note  
Clean the refrigerant circuit. In other words, flush with R1234yf  
refrigerant ⇒ “1.6 Cleaning refrigerant circuit”, page 92 .  
♦ For example, refrigerant has leaked out but no dirt has entered  
the circuit.  
♦ If the gas analysis shows that contaminated refrigerant was in  
the circuit but there appears to be no problem with the function  
of the air conditioning system  
⇒ “2.3 Performing gas analysis of refrigerant”, page 134  
– Drain refrigerant circuit ⇒ page 129 .  
90  
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 1.2.11 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 1.4.1 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 1.6.2 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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