2015-2022 Volkswagen Touran 4 Door Air conditioning system -> 1.3.2 Possible complaints User Manual
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Air conditioning system -> 1.3.2 Possible complaints 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  
♦ The refrigerant temperature sender (with temperature-de‐  
pendent resistor) is installed e.g. in the high pressure line in  
the vicinity of the air conditioner compressor.  
♦ There is a direct correlation between temperature and pres‐  
sure in the refrigerant circuit: if there is too little refrigerant in  
the refrigerant circuit, the temperature in the refrigerant circuit  
rises during operation of the air conditioning system on the  
high pressure side greater than permitted for this pressure.  
Note  
The respective control unit, e.g. the operating and display unit for  
lk  
front air conditioning system - E87- or the Climatronic control unit  
- J255- evaluates the pressure and the temperature in the refrig‐  
erant circuit and switches off the air conditioner compressor if the  
temperature increases above the value stored for this pressure  
⇒ Vehicle diagnostic tester in “Guided Fault Finding” mode - air  
conditioning system and ⇒ Heating, air conditioning; Rep. gr.  
87 ; Refrigerant circuit (vehicle-specific workshop manual).  
1.3  
Possible complaints  
⇒ “1.3.1 Prerequisites for investigating a complaint”, page 64  
⇒ “1.3.2 Possible complaints”, page 64  
⇒ “1.3.3 Odours from heater and air conditioner unit”, page 66  
1.3.1  
Prerequisites for investigating a com‐  
plaint  
•
No fault was evident during fault finding in the electrical sys‐  
tem, vacuum system and air ducts/channels ⇒ Vehicle diag‐  
nostic tester in “Guided Fault Finding” mode - air conditioning  
system (and battery control), ⇒ Current flow diagrams, Elec‐  
trical fault finding and Fitting locations and ⇒ Heating, air  
conditioning; Rep. gr. 00 ; Repair instructions; Checking cool‐  
ing output .  
•
•
Self-diagnosis in “Guided Fault Finding” mode - air condition‐  
ing system (e.g. using ⇒ Vehicle diagnostic tester in “Guided  
Fault Finding” mode - air conditioning system) provides no  
evidence of a complaint.  
No shut-off condition for the air conditioner compressor is dis‐  
played in the measured values of the control unit of the air  
conditioning system ⇒ Vehicle diagnostic tester in “Guided  
Fault Finding” mode - air conditioning system.  
1.3.2  
Possible complaints  
Note  
♦ For all complaints marked with *  
⇒ “2.14 Checking pressures”, page 170 .  
♦ If on vehicles with 2 evaporators a problem is encountered in  
just one evaporator, check the pressures in the refrigerant cir‐  
cuit as well ⇒ “2.14 Checking pressures”, page 170 .  
♦ The cooling has failed completely.*  
♦ Insufficient cooling output at all vehicle speeds and engine  
speeds.*  
♦ No or insufficient cooling after driving a few miles. *  
64  
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  
♦ No cooling or insufficient cooling from one or two evaporators  
(on vehicles with 2nd heater and air conditioner/evaporators).  
*
♦ Actuation of the air conditioner compressor (via the air condi‐  
tioning system magnetic clutch - N25- or the air conditioner  
compressor regulating valve - N280- ) is switched off by the  
respective control unit (e.g. the operating and display unit for  
front air conditioning system - E87- , the air conditioning sys‐  
tem control unit - J301- or the Climatronic control unit - J255- )  
due to pressure in the refrigerant circuit being too high or too  
low * ⇒ Vehicle diagnostic tester in “Guided Fault Finding”  
mode - air conditioning system.  
♦ The electrical air conditioner compressor - V470- is not actu‐  
ated by the control unit for air conditioning compressor - J842-  
due to pressure being too high or too low * ⇒ Vehicle diagnostic  
tester in “Guided Fault Finding” mode - air conditioning system  
and battery regulation.  
♦ If fresh air supply is lacking or drops significantly after a few  
miles (evaporator iced up) *⇒ Vehicle diagnostic tester in “Gui‐  
ded Fault Finding” mode - air conditioning system.  
In addition, the following problems may occur:  
lk  
The air conditioner compressor is noisy.  
– Re-tighten the securing bolts for the air conditioner compres‐  
sor and the air conditioner compressor bracket using a torque  
wrench ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant  
circuit; System overview - refrigerant circuit .  
– Check the routing of the refrigerant lines. These must not rest  
against other components and must not be under any strain  
(realign them if necessary) ⇒ Heating, air conditioning; Rep.  
gr. 87 ; Refrigerant circuit; System overview - refrigerant cir‐  
cuit .  
Noises (refrigerant hammering) occur immediately after the air  
conditioning is switched on and/or in a curve or when the brakes  
are applied:  
– Drain the refrigerant circuit, evacuate it and recharge (too  
much refrigerant or refrigerant oil in the circuit) ⇒ page 129  
and ⇒ “2.14 Checking pressures”, page 170 .  
Note  
Excess refrigerant oil in the circuit may also cause this problem  
(e.g. if the refrigerant oil level was not checked after the air con‐  
ditioner compressor was renewed) ⇒ page 79 .  
Water sprays out of the vents (in dash panel or footwell) although  
air conditioning system is otherwise functioning properly:  
– Check condensation drain to ensure that it is routed correctly.  
It should not be kinked or crushed ⇒ Heating, air conditioning;  
Rep. gr. 87 ; Front heater and air conditioner .  
– The condensed water drain valve must not be hindered in its  
operation by wax or underbody sealant and must open and  
close properly ⇒ Heating, air conditioning; Rep. gr. 87 ; Front  
heater and air conditioner .  
– Check plenum chamber cover. It must not be damaged and  
must be installed correctly (no water should run into the evap‐  
orator) ⇒ Heating, air conditioning; Rep. gr. 87 ; Overview of  
fitting locations - air conditioning system; Overview of fitting  
locations - components outside passenger compartment .  
1. Refrigerant circuit  
65  
GETth  
Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...  
Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017  
– Check water drainage points of plenum chamber. These  
should not be blocked (e.g. by leaves) ⇒ Heating, air condi‐  
tioning; Rep. gr. 87 ; Overview of fitting locations - air condi‐  
tioning system; Overview of fitting locations - components  
outside passenger compartment .  
Note  
Installation location and other information about these compo‐  
nents ⇒ Heating, air conditioning; Rep. gr. 87 ; Overview of fitting  
locations - air conditioning system .  
lk  
1.3.3  
Odours from heater and air conditioner  
unit  
⇒ page 66  
⇒ page 67  
⇒ page 67  
Does the odour emanate from the evaporator or heat exchanger?  
♦ Fishy smell  
– Due to leak in engine's cooling system or in heat exchanger of  
heater and air conditioner unit.  
Note  
If the fishy smell is weaker when the temperature is set too “cold”  
or stronger when the temperature is set to “warm”, check the heat  
exchanger for leaks.  
♦ Smell of a burnt clutch  
♦ Vapours from foot mats, retrospectively installed seat covers  
etc.  
♦ Putrid, mouldy smell  
– Caused by accumulation of debris, pine needles etc. in plenum  
chamber  
Note  
Clean the plenum chamber.  
– Stagnant water that cannot flow out of plenum chamber.  
Note  
Check the water drainage points in the plenum chamber.  
♦ Smell from heater and air conditioner unit  
Note  
Smells that originate from the heater and air conditioner unit can  
be detected in fresh air mode and in recirculation mode.  
66  
Rep. gr.87 - Air conditioning system  
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 1.3.3 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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