Get Air conditioning system -> 1.6.2 Preparations for cleaning refrigerant circuit (flushing with R1234yf refrigerant) 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

♦ 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 cm³of 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).

– 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 .

Rep. gr.87 - Air conditioning system

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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

– Remove receiver ⇒ Heating, air conditioning; Rep. gr. 87 ;

Refrigerant circuit; System overview - refrigerant circuit .

– Remove dirt from receiver.

– Weigh removed receiver.

– Fill enough refrigerant oil into the new receiver so that it has

the same weight as the item that was removed.

– Install new receiver ⇒ Heating, air conditioning; Rep. gr. 87 ;

Refrigerant circuit; System overview - refrigerant circuit .

– Assemble the refrigerant circuit, evacuate and charge

⇒ page 129 .

1.5.8

Renewing desiccant cartridge / desic‐

cant bag with no need to clean refriger‐

ant circuit

Note

Desiccant cartridges or desiccant bags are usually installed de‐

pending 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 .

– Renew desiccant cartridge/desiccant bag ⇒ Heating, air con‐

ditioning; Rep. gr. 87 ; Refrigerant circuit; System overview -

refrigerant circuit (vehicle-specific workshop manual).

Note

If the desiccant cartridge/desiccant bag is permanently installed

in a component (e.g. in the receiver on the condenser) and cannot

be renewed individually, renew the receiver or condenser ⇒

Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit; System

overview - refrigerant circuit .

– Assemble the refrigerant circuit, evacuate and charge

⇒ page 129 .

1. Refrigerant circuit

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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

1.6

Cleaning refrigerant circuit

⇒ “1.6.1 General information about cleaning refrigerant circuit”,

page 92

⇒ “1.6.2 Preparations for cleaning refrigerant circuit (flushing with

R1234yf refrigerant)”, page 94

⇒ “1.6.3 Refrigerant circuit cleaning procedure”, page 96

⇒ “1.6.4 Principle circuit diagrams for cleaning (flushing circuits)

- refrigerant circuit with expansion valve and receiver”,

page 97

⇒ “1.6.5 Principle circuit diagrams for cleaning (flushing circuits)

- refrigerant circuit with restrictor and receiver (without high-volt‐

age system)”, page 102

⇒ “1.6.6 Principle circuit diagrams for cleaning (flushing circuits)

- vehicles with high-voltage system (without auxiliary air condi‐

tioning functions)”, page 105

⇒ “1.6.7 Principle circuit diagrams for cleaning (flushing circuits)

- vehicles with high-voltage system (with auxiliary air conditioning

functions, e.g. heat pump mode)”, page 105

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

⇒ “1.6.9 General information about blowing through with com‐

pressed air or nitrogen”, page 120

⇒ “1.6.10 Blowing through refrigerant circuit with compressed air

or nitrogen”, page 124

1.6.1

General information about cleaning re‐

frigerant circuit

Note

♦ Work on the refrigerant circuit that involves the air conditioner

service station can usually be carried out without the need to

de-energise the high-voltage system.

♦ Since certain components have to be removed to clean (flush)

the refrigerant circuit, the high-voltage system must be de-

energised before work commences ⇒ Electrical system -

hybrid; Rep. gr. 93 ; Electric drive; General warning notices

for work on high-voltage system .

♦ If there is reason to believe that chemical substances (leak

stop additives) have been poured in the refrigerant circuit (that

is be flushed) to seal leaks, do not connect your air conditioner

service station to this refrigerant circuit and do not flush this

refrigerant circuit.

♦ Chemical substances (leak stop additives) used to seal leaks

form deposits in the refrigerant circuit. These can impair the

function of the air conditioning system and cause the air con‐

ditioning system (and your air conditioner service station) to

fail.

♦ Bring the customer's attention to the presence of substances

in the air conditioning system that are not approved by Volks‐

wagen/Audi, which prevent the air conditioning system from

being flushed and repaired.

Rep. gr.87 - Air conditioning system

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Air conditioning system -> 1.6.2 Preparations for cleaning refrigerant circuit (flushing with R1234yf refrigerant) for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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