Get Technical data -> 6.4.3 Environmental aspects 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

♦ The hot refrigerant flows with its heat content to the condenser.

Here, the refrigerant dissipates its heat to the surrounding air

via the condenser due to the temperature gradient between

the refrigerant and the surrounding air.

♦ The refrigerant thus acts as a heat transfer medium. As it is to

be re-used, the refrigerant is returned to the evaporator.

♦ For this reason all air conditioning systems are based on the

refrigerant circulation principle. There are however differences

in the composition of the units

⇒ “1.1 System overview - refrigerant circuit”, page 30 .

6.4.2

Comfort

♦ A basic requirement for concentration and safe driving is a

feeling of comfort in the passenger compartment. This comfort

is only reached by using an air conditioning system, particu‐

larly when it is hot and humid. Of course, open windows, an

open sunroof or increased air ventilation can contribute to

comfort, but they all have certain disadvantages within the ve‐

hicle interior, such as additional noise, draughts, exhaust

gases, unhindered entry of pollen (unpleasant for allergy suf‐

ferers).

♦ A well regulated air conditioning system in conjunction with a

well thought-out heating and ventilation system can create a

feeling of well-being and comfort by regulating the interior

temperature, humidity and rate of air change, regardless of the

external conditions. This must be available whether the vehi‐

cle is moving or not.

Other important advantages of air conditioning are:

♦ Drying of the air in the passenger compartment (humidity in

the air condenses on the cold evaporator and is drained away

as condensate, the air is heated up again on the heat ex‐

changer for heater to a preset temperature, which reduces the

water content in the air and the absolute and relative humidity

is reduced).

♦ Additional cleansing of the air directed into the passenger

compartment (dust and pollen that have made their way

passed the dust and pollen filter, for example, are washed out

by the moist fins of the evaporator and carried off with the

condensation water.)

♦ Temperatures in a mid-range car (for example, after a short

period of driving, ambient temperature 30°C in the shade and

the vehicle in direct sunlight).

With air conditioning Without air condi‐

tioning

Head height

Chest

Footwell

23 °C

24 °C

30 °C

42 °C

40 °C

35 °C

6.4.3

Environmental aspects

♦ Until about 1992, air conditioning systems were equipped with

refrigerant R12. Due to its chlorine atoms, this CFC had a high

potential for destroying ozone and, in addition, a very high po‐

tential for increasing the greenhouse effect.

♦ From 1992, the air conditioning systems of newly manufac‐

tured cars have been successively changed from R12 refrig‐

erant to R134a refrigerant. This refrigerant contains no

chlorine and therefore does no damage to the ozone layer.

Due to the high global warming potential of approx. 1400

(GWP), it may no longer be used in vehicles that are newly

type approved from 2011. The cut-off date for bringing vehi‐

6. Basic technical and physical properties

GETth

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

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

cles that were type approved before 2011 into operation for

the first time with R134a refrigerant is 31.12.2016 (this applies

to countries within the EU, different regulations may apply in

countries outside the EU).

♦ After 01.01.2011, vehicles will only be given a new type ap‐

proval if the refrigerant used in the refrigerant circuit of their

air conditioning system has a GWP of less than 150. R1234yf

refrigerant has a GWP of approx. 4 and is therefore markedly

below the prescribed level.

♦ From 2011, the air conditioning systems of newly manufac‐

tured cars have been successively changed from R134a re‐

frigerant to R1234yf refrigerant. This refrigerant has a global

warming potential of approx. 4. The GWP of carbon dioxide =

1 (global warming potential) and has much less of an impact

on the earth’s atmosphere than R134a refrigerant.

♦ Conversion programmes have been developed for old sys‐

tems filled with the ozone-depleting substance R12 ⇒ Work‐

shop manual for air conditioners with R12 refrigerant (this

workshop manual is available in paper form only).

♦ According to current legislation, R134a refrigerant may still be

charged in vehicles that were type approved for use with

R134a refrigerant (or in vehicles converted from R12 refriger‐

ant to R134a refrigerant) until these vehicles are decommis‐

sioned. No provision has currently been made, therefore, to

convert air conditioning systems from R134a refrigerant to

R1234yf refrigerant ⇒ Air conditioning systems with R134a

refrigerant; Rep. gr. 87 ; Capacities for R134a refrigerant, re‐

frigerant oil and approved refrigerant oils .

♦ To protect the environment, no refrigerant should be released

into the atmosphere

⇒ “2 Legal texts and regulations”, page 5 .

♦ R1234yf refrigerant is chemically stable in an enclosed sys‐

tem. In the earth’s atmosphere, however, it decomposes with‐

in a short space of time (within approx. 14 days) by the

influence of UV light into compounds that do not harm the

earth’s atmosphere (hence the GWP of 4).

6.5

Other reference material

♦ Workshop manual for model-specific maintenance work ⇒

Heating, air conditioning system; Rep. gr. 87 ; Overview of

fitting locations - air conditioning system (vehicle-specific

workshop manual) and ⇒ Current flow diagrams, Electrical

fault finding and Fitting locations

♦ Technical Service Handbook with measures for rectifying lat‐

est malfunctions

♦ Self-study Programmes, videos for workshop training and VW/

Audi TV episodes on the air conditioning system.

♦ The specific risks of refrigerant, material data etc. can be

gleaned from the safety data sheets. Safety data sheets about

refrigerant, refrigerant oil etc. ⇒ VW / Audi ServiceNet .

♦ List of relevant special tools and workshop equipment for re‐

pairs to air conditioning systems ⇒ Electronic parts catalogue

(Tools; Workshop equipment/tools; Heating, air conditioning

system).

♦ Information about the disposal of refrigerant oil and contami‐

nated refrigerant can be found on ⇒ VW / Audi ServiceNet .

♦ For vehicles whose refrigerant circuit is charged with R134a

refrigerant (vehicles that were type approved before

31.12.2010 and have been or are to be commissioned for the

Rep. gr.00 - Technical data

GETth

Technical data -> 6.4.3 Environmental aspects for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

Related Topics

Technical data

Popular Owner Manuals

Latest Owner Manuals