Get Air conditioning system -> 3 Testing equipment and tools Guide for 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

♦ The cause of this fault could also be too much refrigerant oil

in the circuit. Overfilling with refrigerant oil can occur if the re‐

frigerant oil level was not checked after the air conditioner

compressor was renewed.

♦ Further notes regarding this ⇒ page 241 .

Possible deviation from specification during pressure test

•

High pressure and low pressure normal

The requisite cooling output in the evaporator of the heating and air conditioning unit and in the evaporator

for cooling the high-voltage components is not reached.

•

High pressure and low pressure normal

•

The air conditioner compressor is noisy (especially immediately after being switched on)

The requisite cooling output in the evaporator of the heating and air conditioning unit (and/or in the evap‐

orator used to cool the high-voltage components) is not reached.

Possible causes for deviation from specification and rectification

♦ One of the pressure/temperature senders or temperature sensors on or in the refrigerant circuit supplies

incorrect values ⇒ Vehicle diagnostic tester in “Guided Fault Finding” mode and ⇒ Heating, air conditioning;

Rep. gr. 87 ; Overview of fitting locations - air conditioning system

♦ Actuation and function of air conditioner compressor faulty ⇒ Vehicle diagnostic tester in “Guided Fault

Finding” mode.

♦ One of the valves installed in the refrigerant circuit is defective or is not working properly ⇒ Heating, air

conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-specific workshop manual).

♦ Too much refrigerant in circuit.

♦ Expansion valve for the evaporator in the front heating and air conditioning unit defective.

♦ Too much refrigerant oil in circuit.

– Check the measured values of the various pressure/temperature senders and temperature sensors during

operation of the air conditioning system, renew components with false measured values ⇒ Vehicle diag‐

nostic tester in “Guided Fault Finding” mode and ⇒ Heating, air conditioning; Rep. gr. 87 ; Overview of

fitting locations - air conditioning system .

– Check the actuation and function of the air conditioner compressor and repair ⇒ Vehicle diagnostic tester

in “Guided Fault Finding” mode

– Check the function and actuation of the various valves and pressure/temperature senders installed in the

refrigerant circuit by means of the pressure distribution in the refrigerant circuit ⇒ Vehicle diagnostic tester

in “Guided Fault Finding” mode and ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-

specific workshop manual).

– If no fault can be found, extract the refrigerant from the refrigerant circuit.

•

The quantity of refrigerant extracted is significantly greater than the prescribed charge quantity:

– Recharge the refrigerant circuit and repeat the test.

The quantity of refrigerant extracted is about equal to the prescribed charge quantity:

•

– Clean the refrigerant circuit (flush with R1234yf refrigerant ⇒ “1.6 Cleaning refrigerant circuit”, page 92 ).

– Pour in the correct amount of refrigerant oil in the circuit (see note).

Final measures

254

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

Possible deviation from specification during pressure test

– Recharge the refrigerant circuit ⇒ “2.6 Charging refrigerant circuit”, page 146

– Repeat test

⇒ “2.14.5 Checking pressures with air conditioning system switched on - vehicles with electrical air condi‐

tioning compressor”, page 205

Note

♦ Overfilling with refrigerant oil can occur if the refrigerant oil

level was not checked after the air conditioner compressor

was renewed.

♦ If e.g. the expansion valve for the evaporator in the heating

and air conditioning unit or for the evaporator used to cool the

high-voltage components is defective (always open), the

evaporator temperature (in the front heating and air condition‐

ing unit) is no longer regulated in such a way that only gaseous

refrigerant exits the evaporator. It is then possible that under

certain operating conditions, drops of liquid will be drawn into

the air conditioner compressor, which will hen cause noise

(because liquid is incompressible).

♦ If there is too much refrigerant in the refrigerant circuit, the air

conditioner compressor must be emptied and the receiver re‐

newed. After cleaning the refrigerant circuit (flushing with

R1234yf refrigerant)

⇒ “1.6 Cleaning refrigerant circuit”, page 92 , pour the correct

amount of refrigerant oil in the circuit ⇒ Heating, air condi‐

tioning; Rep. gr. 00 ; Technical data (vehicle-specific work‐

shop manual).

♦ Further notes regarding this ⇒ page 241 .

Possible deviation from specification during pressure test

•

High pressure and low pressure normal

The requisite cooling output in the evaporator of the front heating and air conditioning unit (and in the

evaporator for cooling the high-voltage components) is not reached.

•

The requisite cooling output is not reached in the heat exchanger for heat pump operation.

Possible causes for deviation from specification and rectification

2. Working with air conditioner service station

GETth

255

Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...

Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

Possible deviation from specification during pressure test

♦ One of the pressure/temperature senders or temperature sensors on or in the refrigerant circuit supplies

incorrect values ⇒ Vehicle diagnostic tester in “Guided Fault Finding” mode and ⇒ Heating, air conditioning;

Rep. gr. 87 ; Overview of fitting locations - air conditioning system

♦ One of the pumps or one of the valves in the coolant circuit of the high-voltage battery or the engine is

defective or does not work properly ⇒ Heating, air conditioning; Rep. gr. 87 ; Coolant circuit (vehicle-

specific workshop manual).

♦ Actuation and function of air conditioner compressor faulty ⇒ Vehicle diagnostic tester in “Guided Fault

Finding” mode.

♦ One of the valves installed in the refrigerant circuit is defective or is not working properly ⇒ Heating, air

conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-specific workshop manual).

– Check the measured values of the various pressure/temperature senders and temperature sensors during

operation of the air conditioning system, renew components with false measured values ⇒ Vehicle diag‐

nostic tester in “Guided Fault Finding” mode and ⇒ Heating, air conditioning; Rep. gr. 87 ; Overview of

fitting locations - air conditioning system .

– Check how the heat exchanger is included in the coolant circuit of the engine and also check the function

and actuation of the various pumps and valves ⇒ Heating, air conditioning; Rep. gr. 87 ; Coolant circuit

(vehicle-specific workshop manual).

– Check the actuation and function of the air conditioner compressor and repair ⇒ Vehicle diagnostic tester

in “Guided Fault Finding” mode

– Check the function and actuation of the various valves and pressure/temperature senders installed in the

refrigerant circuit by means of the pressure distribution in the refrigerant circuit ⇒ Vehicle diagnostic tester

in “Guided Fault Finding” mode and ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-

specific workshop manual).

– Check the function and actuation of the components used to cool the high-voltage components ⇒ Vehicle

diagnostic tester in “Guided Fault Finding” mode - air conditioning system, air conditioner compressor and

battery regulation

– If no fault can be found, extract the refrigerant from the refrigerant circuit.

– Extract refrigerant from the refrigerant circuit ⇒ “2.4 Emptying refrigerant circuit”, page 137 .

– If the extracted refrigerant volume is considerably less than the specified fill volume (more than 100 g less)

⇒ Heating, air conditioning; Rep. gr. 00 ; Technical data (vehicle-specific workshop manual), search for

the leak and rectify the cause ⇒ “1.4 Investigating leaks”, page 68

– The extracted refrigerant volume approximately equates to the prescribed fill volume, check actuation of

the air conditioner compressor and the installed shut-off valves if no fault is found ⇒ Heating, air condi‐

tioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-specific workshop manual)

– Recharge the refrigerant circuit ⇒ “2.6 Charging refrigerant circuit”, page 146

– Repeat test

⇒ “2.14.5 Checking pressures with air conditioning system switched on - vehicles with electrical air condi‐

tioning compressor”, page 205

Final measures

– Recharge the refrigerant circuit ⇒ “2.6 Charging refrigerant circuit”, page 146

– Repeat test

⇒ “2.14.5 Checking pressures with air conditioning system switched on - vehicles with electrical air condi‐

tioning compressor”, page 205

256

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

♦ If the requisite cooling output at the evaporator in the front

heating and air conditioning unit (and at the evaporator used

to cool the high-voltage components) is OK and there is a

problem owing to lack of heating output in the heat exchanger

for heat pump operation. The cause could be in the coolant

circuit of the high-voltage system or in the coolant circuit of the

engine. If the pumps and valves in the coolant circuit of the

high-voltage system are not actuated correctly or their function

is not OK, not enough heat energy can be drawn from the

coolant via the evaporator (heat exchanger) used to cool the

high-voltage components. If the pumps and valves in the cool‐

ant circuit of the engine are not actuated correctly or their

function is not OK, the heat energy cannot be dissipated via

the heat exchanger for heat pump function to the coolant that

flows to the heat exchanger in the heating and air conditioning

unit ⇒ Vehicle diagnostic tester in “Guided Fault Finding” mode

and ⇒ Heating, air conditioning; Rep. gr. 87 ; Coolant circuit

(vehicle-specific workshop manual).

♦ Further notes regarding this ⇒ page 241 .

2. Working with air conditioner service station

GETth

257

Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...

Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

Testing equipment and tools

⇒ “3.1 Tools and materials available from distribution centre or

importer”, page 258

⇒ “3.2 Tools and materials available commercially”, page 258

⇒ “3.3 Tools that can be locally manufactured”, page 259

3.1

Tools and materials available from dis‐

tribution centre or importer

Tools and materials are available from the “Electronic parts cata‐

logue (ETKA)” ⇒ Electronic parts catalogue .

Overview

Air conditioner service station with flushing device

– With integrated program for flushing the refrigerant circuit with R1234yf refrigerant and the associated

flushing device

– With integrated analysis unit for finding contamination in the R1234yf refrigerant

R1234yf refrigerant ⇒ Electronic parts catalogue

Extraction device (for R1234yf refrigerant) dry ice box

Adapter case, VW/Audi passenger vehicle set

– Used to connect the air conditioner service station to the refrigerant circuit for flushing and for bridging

removed components when flushing

– Used to connect certain components to the pressure hose to blow through with compressed air or nitrogen

Leak detector for R1234yf/R134A

Combination fine filter unit for compressed air system

Seals (different versions, pay attention to correct allocation) ⇒ Electronic parts catalogue

Refrigerant oil (different versions, pay attention to correct allocation) ⇒ Electronic parts catalogue

Leak detection system with following contents:

♦ Cleaning agent

♦ UV leak detector lamp

♦ Replacement bulb for leak detector lamp

♦ Safety glasses

♦ Sticker

♦ Protective gloves

♦ System case

Tracer replenishment cartridge

Release tools for refrigerant line with quick-release couplings

Removal tool for quick-release couplings of refrigerant lines

Tool attachments for removing and installing valves

3.2

Tools and materials available commer‐

cially

Note

This list is an overview of the test equipment, tools and materials

necessary for professional repairs to the refrigerant circuit.

258

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

Overview

Fin comb

Charge hoses 5/8"-18 UNF

Connector piece for pressure cylinders for refrigerant and sealing ring with quick-release connector or threaded

connector

Valve cap 5/8" -18 UNF

Pressure gauge set with pressure reducer for nitrogen

Quick release coupling adapter for service connections (qty. 2 included with air conditioner service station ).

Flared ring spanners of widths matching those of the threaded connections on the refrigerant lines.

Valve opener for charge hoses

Connection nipple for conical surface seal 5/8"-18 UNF

Compressed air gun with rubber tip

Manual stop valve 5/8" -18 UNF

Recycling cylinder for contaminated R1234yf refrigerant

Digital thermometer

Protective gloves

Safety glasses

Dry ice pellets

3.3

Tools that can be locally manufactured

Note

This list is an overview of the test equipment, tools and materials

necessary for professional repairs to the refrigerant circuit.

Overview

Page

Charging hose with connection to workshop compressed air system

Not illustrated

Charging hose with connection to workshop compressed air sys‐

tem

A - Charging hose 5/8" - 18 UNF** (version with large internal

diameter)

B - Connector for workshop compressed air system** (for use only

with filter)

** Tools and materials available commercially

3. Testing equipment and tools

259

GETth

Air conditioning system -> 3 Testing equipment and tools for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

Related Topics

Air conditioning system

Popular Owner Manuals

Latest Owner Manuals