Get Air conditioning system -> 1.7.2 Pressure gauges enable the following test and measurement work Guide for Volkswagen Touran 4 Door Second Generation (2015-2022)

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

– Extract the mixture of refrigerant, refrigerant oil, compressed

air or nitrogen escaping out of the components with an extrac‐

tion system.

Note

Compressed air and nitrogen cannot be blown through the re‐

strictor, expansion valve, air conditioner compressor, receiver or

reservoir.

– In cases where condensers have a drying agent cartridge in

the integrated receiver, this drying agent cartridge must be re‐

moved.

Note

♦ With condensers in which the receiver / desiccant cartridge are

integrated and cannot be renewed individually, the condenser

is to be renewed after cleaning (flushing).

♦ Depending on the version, receivers - in which the desiccant

cartridge is to be renewed individually - may feature an addi‐

tional filter element, which will need to be renewed with the

desiccant cartridge if necessary.

– First blow out old refrigerant oil and contaminants with com‐

pressed air, then blow out components with nitrogen (clean,

blow out or dehumidify old refrigerant oil).

– Adapter for connecting pressure hose to refrigerant circuit

Adapter case for VW/Audi passenger vehicles ⇒ Electronic

parts catalogue .

To prevent oil and moisture from the compressed air system

making its way into the refrigerant circuit, the following points must

be observed.

♦ The compressed air must be fed through a compressed air

cleaning unit to clean and dry it. Therefore, use a filter and

dryer for compressed air (included in the supply of tools for

paint systems) ⇒ Electronic parts catalogue .

♦ On refrigerant lines with threads or union nuts on the connec‐

tion, use adapter from refrigerant circuit adapter set - V.A.G

1785- ( adapter - V.A.G 1785/1- to adapter - V.A.G 1785/8- )

to connect the 5/8" - 18 UNF charges hose (one part of this

adapter is also included in the adapter case for VW/Audi pas‐

senger vehicles ).

♦ On refrigerant lines without thread or union nut on the con‐

nection (for connection of adapters), use adapter from adapter

case VW/Audi passenger vehicle set or proprietary air blow

gun with rubber nozzle.

Note

Always extract any escaping air and/or nitrogen from the compo‐

nents using appropriate local exhaust ventilation LEV (e.g. work‐

shop extraction system).

The refrigerant circuit (or individual components) must be blown

through if there are no means of flushing or flushing does not ap‐

pear to be the appropriate solution.

– if there is dirt or contamination in individual components of the

refrigerant circuit.

122

Rep. gr.87 - Air conditioning system

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

– The search for faults in the electrical system, the vacuum sys‐

tem and the air ducts did not turn up any fault.(Moisture is in

the refrigerant circuit and builds up pressure.)

– If the refrigerant circuit has been left open for longer than nor‐

mally required for repairs (e.g. following an accident).

– Pressure and temperature measurements in the circuit indi‐

cate that there is moisture in the refrigerant circuit.

– The vehicle-specific workshop manual deems it necessary af‐

ter replacement of certain components ⇒ Heating, air condi‐

tioning; Rep. gr. 87 ; Refrigerant circuit, System overview -

refrigerant circuit .

Note

Certain contaminants and old refrigerant oil are difficult or impos‐

sible to remove from the refrigerant circuit with compressed air or

nitrogen. These contaminants can be removed, for example, by

flushing with refrigerant R1234yf

⇒ “1.6 Cleaning refrigerant circuit”, page 92 .

♦ Blow through refrigerant circuit with compressed air or nitro‐

gen

⇒ “1.6.10 Blowing through refrigerant circuit with compressed

air or nitrogen”, page 124

1. Refrigerant circuit

123

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

1.6.10

Blowing through refrigerant circuit with

compressed air or nitrogen

Note

♦ Vehicles with refrigerant lines that do not have a thread on

which to connect adapter - 1785- require e.g. a compressed

air gun with rubber nozzle or an adapter from adapter case for

VW/Audi passenger vehicles to blow out individual compo‐

nents. When using a compressed air gun with rubber nozzle,

be particularly careful not to damage the connections (do not

crush or scratch them).

♦ The evaporator should be blown through from the connection

to the low pressure side (large diameter), with the expansion

valve or restrictor removed.

♦ Always blow out components against the direction of refriger‐

ant flow (or flush with R1234yf refrigerant).

♦ Examine the expansion valve; renew if dirty or corroded.

♦ If there are dark sticky deposits in the components, and these

cannot be removed with compressed air, flush these compo‐

nents with refrigerant R1234yf or renew.

♦ Thin, light grey deposits on the insides of pipes do not impair

the function of the components.

♦ After blowing out, renew the receiver (desiccant cartridge) or

reservoir and restrictor. In cases where condensers have a

drying agent cartridge in the integrated receiver, this drying

agent cartridge must be renewed.

♦ On vehicles having condensers with an integrated receiver/

desiccant cartridge which cannot be renewed separately or

which are not available as a replacement part, the condenser

must be renewed after flushing the refrigerant circuit ⇒ Elec‐

tronic parts catalogue and ⇒ Heating, air conditioning; Rep.

gr. 87 ; Refrigerant circuit; System overview - refrigerant cir‐

cuit (vehicle-specific workshop manual).

♦ Depending on the version, receivers - in which the desiccant

cartridge is to be renewed individually - may feature an addi‐

tional filter element, which will need to be renewed with the

desiccant cartridge if necessary.

After blowing out the refrigerant circuit:

– Renew these vehicle-specific components (restrictor and res‐

ervoir, expansion valve and receiver / dryer cartridge) ⇒

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

System overview - refrigerant circuit (vehicle-specific work‐

shop manual) and ⇒ Electronic parts catalogue

– Depending on complaint, renew air conditioner compressor ⇒

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

System overview - refrigerant circuit (vehicle-specific work‐

shop manual) and ⇒ Electronic parts catalogue or drain

remaining refrigerant oil from removed air conditioner com‐

pressor ⇒ “1.5 Renewing components”, page 79 and refill with

requisite amount of fresh refrigerant oil ⇒ Heating, air condi‐

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

shop manual) and ⇒ Heating, air conditioning; Rep. gr. 00 ;

Technical data; Refrigerant oil .

124

Rep. gr.87 - Air conditioning system

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Air conditioning system -> 1.7.2 Pressure gauges enable the following test and measurement work for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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