Get Air conditioning system -> 1.5.4 Renewing air conditioner compressor with no need to clean refrigerant circuit 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 following replacement parts (air conditioner compressor,

receiver, evaporator and condenser) could be filled with nitro‐

gen gas, though this filling is not always guaranteed. There‐

fore, little or no pressure equalisation may be perceived when

the sealing plugs of the replacement part are unscrewed.

♦ Depending on the storage location and storage period, it is

possible on components filled with nitrogen ex-works that

barely any pressure equalisation - if at all - is perceptible and,

as such, nothing can be said about the leak-tightness of the

component. This means, for example, that the nitrogen gas

filling could escape through the shaft seal of a replacement air

conditioner compressor in the course of time, even though the

air conditioner compressor is leak-tight.

♦ Since spare parts are sometimes stored for long periods in

various places, there is a good chance that gas may escape

from some parts when first opened but not from others (even

of the same part number). Therefore, be careful when un‐

screwing the sealing plugs from the replacement part connec‐

tions and allow the nitrogen gas to escape slowly.

♦ One or 2 expansion valves and a receiver or desiccant con‐

tainer are installed in the refrigerant circuit ⇒ Heating, air

conditioning; Rep. gr. 87 ; Refrigerant circuit; System over‐

view - refrigerant circuit .

♦ Renew the desiccant cartridge or components with desiccant

bag (receiver) after cleaning the refrigerant circuit (flush with

R1234yf refrigerant

⇒ “1.6 Cleaning refrigerant circuit”, page 92 ). When doing

so, keep the circuit closed for as long as possible to keep the

ingress of moisture as low as possible.

♦ Seal open connections and pipes (to prevent absorption of

moisture).

Note

Contaminated refrigerant oils are to be disposed of as used oil of

unknown origin (observe local regulations) ⇒ VW / Audi Service‐

Net .

1.5.2

Renewing leaking or damaged compo‐

nents of empty refrigerant circuit (apart

from air conditioner compressor and re‐

ceiver)

The refrigerant circuit was completely empty (e.g. larger leaks or

ruptured hose line)

♦ Observe the general information about renewing components

⇒ “1.5.1 General information about renewing components”,

page 79

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

Note

♦ If there is just a small leak and the refrigerant only escaped in

small quantities (e.g. small leakage point), the amount of re‐

frigerant oil that escapes and the degree of moisture ingress

are not enough to impair the function of the air conditioning

system once the repair has been carried out.

♦ The measures marked with * should only be performed if leaks

are more pronounced (e.g. following an accident).

Electrical air conditioner compressor

– Remove defective component * ⇒ Heating, air conditioning;

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

circuit .

– Remove electrical air conditioning compressor and clean

(flush with R1234yf refrigerant) *

⇒ “1.6 Cleaning refrigerant circuit”, page 92 and ⇒ Heating,

air conditioning; Rep. gr. 87 ; Air conditioner compressor; Re‐

moving and installing electrical air conditioning compressor

(vehicle-specific workshop manual).

– Clean the refrigerant circuit (flush with R1234yf refrigerant)*

⇒ “1.6 Cleaning refrigerant circuit”, page 92 .

– Completely charge the air conditioner compressor or refriger‐

ant circuit with the requisite amount of oil

⇒ “1.5.4 Renewing air conditioner compressor with no need to

clean refrigerant circuit”, page 85 and ⇒ Heating, air condi‐

tioning; Rep. gr. 00 ; Technical data (approved refrigerant oils

and fill capacities for refrigerant oil in vehicle-specific work‐

shop manual).

Mechanical air conditioner compressor

– Remove defective component * ⇒ Heating, air conditioning;

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

circuit .

– Remove air conditioner compressor.* ⇒ Heating, air condi‐

tioning; Rep. gr. 87 ; Air conditioner compressor .

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

– Unscrew oil drain plug -B- / -D- from air conditioner compres‐

sor -A-.*

Note

♦ The design of the oil drain plug -B- / -D- and seal -C- / -E- may

vary (depending on the manufacturer of the air conditioner

compressor) ⇒ Heating, air conditioning; Rep. gr. 87 ; Air

conditioner compressor (vehicle-specific workshop manual).

♦ When installing the oil drain plug -B-/-D-, observe the corre‐

sponding torque specification (depending on the manufacturer

of the air conditioner compressor and the design of the oil drain

plug). Please note that the oil drain plug of air conditioner

compressors manufactured by Denso and Delphi is equipped

with an oil seal ⇒ Heating, Air conditioning; Rep. gr. 87 ; Air

conditioning compressor, Assembly overview - drive unit of air

conditioner compressor (currently valid specified torque:

30 Nm for “Denso” and 15 Nm for “Delphi” air conditioner com‐

pressor). The oil drain plug of air conditioner compressors

manufactured by “Sanden” and “Zexel- / Valeo” may be equip‐

ped with an O-ring or an oil seal (depending on the vehicle

equipment; currently valid specified torque: 10 Nm, respec‐

tively).

♦ On the Denso air conditioner compressor, for example, the oil

drain plug -D- has an oil seal -E-; renew ⇒ Heating, air con‐

ditioning; Rep. gr. 87 ; Air conditioner compressor (vehicle-

specific workshop manual) and ⇒ Electronic parts catalogue .

♦ On the Sanden air conditioner compressor, for example, the

oil drain plug -B- has a seal -C-; renew ⇒ Heating, air condi‐

tioning; Rep. gr. 87 ; Air conditioner compressor (vehicle-

specific workshop manual) and ⇒ Electronic parts catalogue .

♦ If a seal (oil seal or O-ring) fitted to the oil drain plug is not

available as a replacement part, the removed old part can be

reused (as an exception to the general rule of using new seals

only). The old seal, however, must always be checked for

damage prior to installation. If any damage or deformation is

detected on the old seal, it must be renewed with a commer‐

cially available new part.

♦ After filling the refrigerant circuit, check the installed oil drain

plug for leaks using e.g. an electronic leak detector.

♦ 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.

– Pour out old refrigerant oil from the air conditioner compressor

⇒ “1.5.4 Renewing air conditioner compressor with no need to

clean refrigerant circuit”, page 85 (disposal ⇒ VW / Audi

ServiceNet ).

1. Refrigerant circuit

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Air conditioning system -> 1.5.4 Renewing air conditioner compressor with no need to clean refrigerant circuit for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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