2015-2022 Volkswagen Touran 4 Door Air conditioning system -> 2.1 Working with air conditioner service station User Manual
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Air conditioning system -> 2.1 Working with air conditioner service station 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  
♦ Replacement compressors contain a certain specified quantity  
of refrigerant oil. On vehicles with two evaporators, a certain  
amount of refrigerant oil may also have to be filled in the circuit  
if necessary ⇒ Heating, air conditioning; Rep. gr. 00 ; Tech‐  
nical data and ⇒ Heating, air conditioning; Rep. gr. 87 ;  
Refrigerant circuit; System overview - refrigerant circuit .  
♦ If the air conditioner compressor does not need to be renewed,  
replenish the refrigerant oil accordingly up to the prescribed fill  
level (empty refrigerant oil and pour the prescribed volume  
back into the air conditioner compressor or refrigerant circuit)  
⇒ page 79 , ⇒ Heating, air conditioning; Rep. gr. 00 ; Tech‐  
nical data; refrigerant oil .  
– Completely reassemble the refrigerant circuit again ⇒ Heat‐  
ing, air conditioning; Rep. gr. 87 ; Refrigerant circuit; System  
lk  
overview - refrigerant circuit (vehicle-specific workshop man‐  
ual).  
– Evacuate and charge the refrigerant circuit in the prescribed  
manner ⇒ “2.5 Evacuating refrigerant circuit”, page 140 and  
⇒ “2.6 Charging refrigerant circuit”, page 146  
– Bring the air conditioning system into operation in the prescri‐  
bed manner ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrig‐  
erant circuit; Bringing air conditioning system into operation  
after charging refrigerant circuit and  
⇒ “2.7 Bringing air conditioning system into service after  
charging”, page 149  
1. Refrigerant circuit  
125  
GETth  
Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...  
Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017  
1.7  
Checking pressures with pressure  
gauge  
⇒ “1.7.1 Display on pressure gauges”, page 126  
⇒ “1.7.2 Pressure gauges enable the following test and meas‐  
urement work”, page 126  
1.7.1  
Display on pressure gauges  
1 - Temperature scale for R1234yf refrigerant (CF CF = CH )  
3
2
in °C  
lk  
2 - Pressure scale in bar overpressure  
Note  
♦ Pressure is indicated in various units: 1 MPa (Mega-Pascal)  
is equal to 10 bar or 145 psi; 1 bar absolute pressure is equal  
to 0 bar, which is about the same as ambient pressure (at‐  
mospheric pressure).  
♦ This diagram shows a pressure gauge displaying pressure on  
the low pressure side. The display here is shown in bar over‐  
pressure (noticeable by “-1” in the display).  
In addition to the pressure scale, the pressure gauges can have  
one or more temperature scales. The scale values for R1234yf  
are assigned according to the vapour pressure table. Because  
different refrigerants have different vapour pressures at the same  
temperature, each temperature scale is labelled for the respective  
refrigerant.  
♦ Pressure gauges enable the following testing and measuring  
measures  
⇒ “1.7.2 Pressure gauges enable the following test and meas‐  
urement work”, page 126 .  
1.7.2  
Pressure gauges enable the following  
test and measurement work  
Pressure and temperature measurement in refrigerant circuit  
♦ The high pressure gauge allows the pressure (and tempera‐  
ture) to be measured with the air conditioning system switched  
on irrespective of whether this is at the outlet of the air condi‐  
tioner compressor through the condenser up to the restriction  
(restrictor or expansion valve).  
♦ The low pressure gauge facilitates measurement of the pres‐  
sure (and temperature) that spreads evenly from the restric‐  
tion (restrictor or expansion valve) through the evaporator up  
to the inlet of the air conditioner compressor with the air con‐  
ditioning system switched on.  
Note  
The relationship between pressure and temperature shown on  
the pressure gauges is valid only where the refrigerant in the cir‐  
cuit is liquid or vapour, but not when it is gas. In the gaseous state,  
the temperature is approx. 10°C to 30°C higher than indicated on  
the pressure gauge.  
Evidence of refrigerant in a closed container  
R1234yf refrigerant is present in a closed container or refrigerant  
circuit if the temperature indicated on the pressure gauge corre‐  
126  
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  
sponds to the temperature of the refrigerant (the temperature of  
a standing fluid stabilises at ambient temperature).  
A closed container or isolated refrigerant circuit is empty if the  
temperature indicated on the pressure gauge is below the tem‐  
perature of the refrigerant.  
lk  
Note  
♦ The dependency between pressure and temperature descri‐  
bed on the pressure gauges no longer applies when there is  
no liquid and the pressure is created by gas alone.  
♦ Since the R1234yf and R134a refrigerant pressures are very  
close to each other over a broad temperature range, it is not  
possible to distinguish between them by means of the pres‐  
sure measurement. It is possible to distinguish between them  
e.g. by means of a gas analysis  
⇒ “6.2.16 Analysis of refrigerant R1234yf”, page 24 .  
1. Refrigerant circuit  
127  
GETth  

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 1.6.1 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 2.2 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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