Get Air conditioning system Refrigerant circuit -> 1.3 Possible complaints Guide for Volkswagen Sharan VAN Second Generation (2010-2023)

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

♦ The refrigerantemperature sender (with temperature-de‐

pendenresistor) is installed e.g. in the high pressure line in

the vicinity of the air conditioner compressor.

♦ There is a direccorrelation between temperature and pres‐

sure in the refrigerancircuit: if there is too little refrigeranin

the refrigerancircuit, the temperature in the refrigerancircui

rises during operation of the air conditioning system on the

high pressure side greater than permitted for this pressure.

Note

The respective control unit, e.g. the operating and display unifor

fronair conditioning system - E87- or the Climatronic control uni

- J255- evaluates the pressure and the temperature in the refrig‐

erancircuiand switches off the air conditioner compressor if the

temperature increases above the value stored for this pressure

⇒ Vehicle diagnostic tester in “Guided FaulFinding” mode - air

conditioning system and ⇒ Heating, air conditioning; Rep. gr.

87 ; Refrigerancircui(vehicle-specific workshop manual).

1.3

Possible complaints

⇒ “1.3.1 Prerequisites for investigating a complaint”, page 64

⇒ “1.3.2 Possible complaints”, page 64

⇒ “1.3.3 Odours from heater and air conditioner unit”, page 66

1.3.1

Prerequisites for investigating a com‐

plain

•

No faulwas evidenduring faulfinding in the electrical sys‐

tem, vacuum system and air ducts/channels ⇒ Vehicle diag‐

nostic tester in “Guided FaulFinding” mode - air conditioning

system (and battery control), ⇒ Currenflow diagrams, Elec‐

trical faulfinding and Fitting locations and ⇒ Heating, air

conditioning; Rep. gr. 00 ; Repair instructions; Checking cool‐

ing outpu.

•

Self-diagnosis in “Guided FaulFinding” mode - air condition‐

ing system (e.g. using ⇒ Vehicle diagnostic tester in “Guided

FaulFinding” mode - air conditioning system) provides no

evidence of a complaint.

No shut-off condition for the air conditioner compressor is dis‐

played in the measured values of the control uniof the air

conditioning system ⇒ Vehicle diagnostic tester in “Guided

FaulFinding” mode - air conditioning system.

1.3.2

Possible complaints

Note

♦ For all complaints marked with *

⇒ “2.14 Checking pressures”, page 170 .

♦ If on vehicles with 2 evaporators a problem is encountered in

jusone evaporator, check the pressures in the refrigerancir‐

cuias well ⇒ “2.14 Checking pressures”, page 170 .

♦ The cooling has failed completely.*

♦ Insufficient cooling outpuaall vehicle speeds and engine

speeds.*

♦ No or insufficiencooling after driving a few miles. *

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

♦ No cooling or insufficiencooling from one or two evaporators

(on vehicles with 2nd heater and air conditioner/evaporators).

♦ Actuation of the air conditioner compressor (via the air condi‐

tioning system magnetic clutch - N25- or the air conditioner

compressor regulating valve - N280- ) is switched off by the

respective control uni(e.g. the operating and display unifor

fronair conditioning system - E87- , the air conditioning sys‐

tem control uni- J301- or the Climatronic control uni- J255- )

due to pressure in the refrigerancircuibeing too high or too

low * ⇒ Vehicle diagnostic tester in “Guided FaulFinding”

mode - air conditioning system.

♦ The electrical air conditioner compressor - V470- is noactu‐

ated by the control unifor air conditioning compressor - J842-

due to pressure being too high or too low * ⇒ Vehicle diagnostic

tester in “Guided FaulFinding” mode - air conditioning system

and battery regulation.

♦ If fresh air supply is lacking or drops significantly after a few

miles (evaporator iced up) *⇒ Vehicle diagnostic tester in “Gui‐

ded FaulFinding” mode - air conditioning system.

In addition, the following problems may occur:

The air conditioner compressor is noisy.

– Re-tighten the securing bolts for the air conditioner compres‐

sor and the air conditioner compressor brackeusing a torque

wrench ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigeran

circuit; System overview - refrigerancircui.

– Check the routing of the refrigeranlines. These musnores

againsother components and musnobe under any strain

(realign them if necessary) ⇒ Heating, air conditioning; Rep.

gr. 87 ; Refrigerancircuit; System overview - refrigerancir‐

cui.

Noises (refrigeranhammering) occur immediately after the air

conditioning is switched on and/or in a curve or when the brakes

are applied:

– Drain the refrigerancircuit, evacuate iand recharge (too

much refrigeranor refrigeranoil in the circuit) ⇒ page 129

and ⇒ “2.14 Checking pressures”, page 170 .

Note

Excess refrigeranoil in the circuimay also cause this problem

(e.g. if the refrigeranoil level was nochecked after the air con‐

ditioner compressor was renewed) ⇒ page 79 .

Water sprays ouof the vents (in dash panel or footwell) although

air conditioning system is otherwise functioning properly:

– Check condensation drain to ensure thaiis routed correctly.

Ishould nobe kinked or crushed ⇒ Heating, air conditioning;

Rep. gr. 87 ; Fronheater and air conditioner .

– The condensed water drain valve musnobe hindered in its

operation by wax or underbody sealanand musopen and

close properly ⇒ Heating, air conditioning; Rep. gr. 87 ; Fron

heater and air conditioner .

– Check plenum chamber cover. Imusnobe damaged and

musbe installed correctly (no water should run into the evap‐

orator) ⇒ Heating, air conditioning; Rep. gr. 87 ; Overview of

fitting locations - air conditioning system; Overview of fitting

locations - components outside passenger compartmen.

1. Refrigerancircui

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

– Check water drainage points of plenum chamber. These

should nobe blocked (e.g. by leaves) ⇒ Heating, air condi‐

tioning; Rep. gr. 87 ; Overview of fitting locations - air condi‐

tioning system; Overview of fitting locations - components

outside passenger compartmen.

Note

Installation location and other information abouthese compo‐

nents ⇒ Heating, air conditioning; Rep. gr. 87 ; Overview of fitting

locations - air conditioning system .

1.3.3

Odours from heater and air conditioner

uni

⇒ page 66

⇒ page 67

Does the odour emanate from the evaporator or heaexchanger?

♦ Fishy smell

– Due to leak in engine's cooling system or in heaexchanger of

heater and air conditioner unit.

Note

If the fishy smell is weaker when the temperature is setoo “cold”

or stronger when the temperature is seto “warm”, check the hea

exchanger for leaks.

♦ Smell of a burnclutch

♦ Vapours from foomats, retrospectively installed seacovers

etc.

♦ Putrid, mouldy smell

– Caused by accumulation of debris, pine needles etc. in plenum

chamber

Note

Clean the plenum chamber.

– Stagnant water thacannoflow ouof plenum chamber.

Note

Check the water drainage points in the plenum chamber.

♦ Smell from heater and air conditioner uni

Note

Smells thaoriginate from the heater and air conditioner unican

be detected in fresh air mode and in recirculation mode.

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

– Due to too much condensate in the heater and air conditioner

uni

Note

Check the condensation drain.

– Due to an old or very dirty dusand pollen filter

Note

Check the dusand pollen filter.

– Due to deposits on the fins of the evaporator

Note

Clean the evaporator with the ultrasonic air conditioner cleaning

uni⇒ page 67 or suction feed spray-gun and corresponding

spray lance ⇒ page 67 .

Ultrasonic air conditioner cleaning uni

– The ultrasonic air conditioner cleaning unimusbe placed in

the front-passenger footwell and sprays the agenAero-Clean.

Aero-Clean neutralises microbes and bacteria in the heater

and air conditioner unit.

The device is provided with instructions for use.

Currenequipmen⇒ Electronic parts catalogue .

Spraying the evaporator with the suction feed spray-gun and

spray lance

Directly spray the evaporator with cleaning solution using a spray

lance (approx. 10 bar). The cleaning solution neutralises mi‐

crobes and bacteria directly on the evaporator.

To enable access to the evaporator, preparatory measures and

differenspray lances are required.

Vehicle-specific operating instructions are provided with the

evaporator cleaning solution ⇒ Electronic parts catalogue .

1. Refrigerancircui

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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017

1.4

Investigating leaks

⇒ “1.4.1 General information abouinvestigating leaks in the re‐

frigerancircuit”, page 68

⇒ “1.4.2 Searching for leaks in refrigerancircuits using an elec‐

tronic leak detector”, page 69

⇒ “1.4.3 Searching for leaks with UV leak detection system”, page

⇒ “1.4.4 Detecting leaks in a vacuum tesusing air conditioner

service station , or in a pressure test”, page 77

⇒ “1.4.5 Detecting leaks in a pressure tes(with nitrogen or com‐

pressed air)”, page 77

1.4.1

General information abouinvestigating

leaks in the refrigerancircui

Note

♦ Small leaks can be detected with e.g. an electronic leak de‐

tector or a UV leak detector lamp.

♦ This workshop manual describes 2 ways of tracing leaks in

refrigerancircuits. These procedures have been tested and

lead to a reliable resulunder the differenusage conditions if

they are performed correctly and in accordance with the spe‐

cific complaint.

♦ Various methods are offered in the open markewith which

leaks in refrigerancircuits can be traced. These methods are

noable to provide clear results in all cases and, unless the

exacprocedure is adhered to, they can also resulin various

components of the refrigerancircuibeing identified as having

leaks even though they do not. Furthermore, certain process‐

es can cause preliminary or permanendamage to the com‐

ponents of the refrigerancircui

♦ Components thaare found to be leaking musnobe repaired.

They musbe renewed instead.

♦ A leaking refrigerancircuimusnobe charged with refriger‐

ant. Therefore, evacuate an empty refrigerancircuiand

check for leaks before charging the system with refrigeran

⇒ “2.5 Evacuating refrigerancircuit”, page 140 .

Rep. gr.87 - Air conditioning system

Air conditioning system Refrigerant circuit -> 1.3 Possible complaints for Your Volkswagen Sharan VAN Second Generation (2010-2023)

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