Volkswagen Golf / Golf GTI / Golf Variant. Manual - part 695

12 - Restrictor
13 - Check Valve
14 - After-Run Coolant Pump -

V51-
15 - Engine Coolant Temperature Sensor - G62-
16 - Coolant Shut-Off Valve - N82-
17 - Restrictor
18 - Recirculation Pump - V55-
19 - Coolant Pump
20 - Coolant Shut-Off Valve - N82-
21 - Check Valve
22 - transmission fluid cooling circuit
23 - Auxiliary Cooler

❑ Installed location: inside the right front wheel housing

1.2

Coolant System, Checking for Leaks

Special tools and workshop equipment required
♦ Cooling System Tester - VAG1274B-
♦ Cooling System Tester - Adapter - VAG1274/8-
♦ Cooling System Tester - Adapter - VAG1274/9-
Procedure
• Engine at operating temperature.

CAUTION

The coolant system is under pressure when the engine is warm.

Risk of scalding due to hot steam and hot coolant.
Possibility of burning or scalding the skin and other parts of the

body.
– Wear safety gloves.
– Wear protective eyewear.
– Reduce the pressure: cover the coolant reservoir cap with a

cloth and carefully open.

– Remove the cap -arrow- from the coolant expansion tank.

– Position the Cooling System Tester - VAG1274B- with the

adapter -VAG1274/8- on the coolant expansion tank.

– Generate approximately 1 bar pressure (14.5 psi) using the

cooling system tester hand pump.

– If pressure falls, search for leaks and correct problem.

Pressure Relief Valve in Cap, Checking
– Position the Cooling System Tester - VAG1274B- with the

adapter -VAG1274/9- on the cap.

– Generate pressure with cooling system tester hand pump.
• The pressure release valve must open at 1.6 to 1.8 bar (23.2

to 26.1 psi).

– If pressure relief valve does not open as specified, replace

cap.

1.3

Coolant, Draining and Filling

Special tools and workshop equipment required
♦ Cooling System Tester - Adapter - VAG1274/8-
♦ Hose Clip Pliers - VAS6340-
♦ Cooling System Charge Kit - VAS6096-
♦ Shop Crane - Drip Tray - VAS6208-
♦ Refractometer - T10007A-
♦ Vehicle Diagnostic Tester
♦ Protective Eyewear
♦ Safety Gloves
Draining

CAUTION

The coolant system is under pressure when the engine is warm.

Risk of scalding due to hot steam and hot coolant.
Possibility of burning or scalding the skin and other parts of the

body.
– Wear safety gloves.
– Wear protective eyewear.
– Reduce the pressure: cover the coolant reservoir cap with a

cloth and carefully open.

– Remove the cap -arrow- from the coolant expansion tank.
– Remove the noise insulation. Refer to ⇒  Body Exterior; Rep.

Gr.  66 ; Noise Insulation; Overview - Noise Insulation .

– Place the Shop Crane - Drip Tray - VAS6208- underneath.

– Remove the lower right coolant hose -1- from the radiator, and

drain the coolant.

Filling

Note

♦

The water portion of the coolant influences the effectiveness

of the coolant. Based on the contents, the country or even the

region specific quality can be different. Use distilled water. For

this reason, we recommend using distilled water when adding

coolant or filling coolant for the first time.

♦

Use only coolant additives listed in the Parts Catalog. Other

coolant additives may above all reduce the corrosion protec‐

tion effect significantly. The damage resulting from this may

lead to loss of coolant and consequently to severe engine

damage.

♦

Coolant with the correct mixture ratio prevents freezing and

corrosion damage and calcium deposits. The boiling point will

be raised. The cooling system must be filled with coolant ad‐

ditive year-round.

♦

Because of its high boiling point, the coolant contributes to

engine reliability under heavy loads, particularly in countries

with tropical climates.

♦

The Refractometer - T10007A- MUST be used to determine

the freeze protection value.

♦

Protection against frost must be assured down to minimum -25

°C (-13 °F) (in arctic climatic countries down to approximately

-36 °C (-33 °F)). When stronger freeze protection is needed

due to the climate, the freeze protection may be increased. But

only down to -48 °C (-54 °F), otherwise the effectiveness of

the coolant decreases.

♦

The coolant concentration must not be reduced by adding wa‐

ter even in warmer seasons and in warmer countries. The frost

protection must be at least -25 °C (-13 °F).

♦

Read the freeze protection value on the scale for the coolant

additive that has been added.

♦

The temperature on the Refractometer - T10007A- corre‐

sponds to the »freezing point«. At this temperature, ice crys‐

tals may begin to form in the coolant.

♦

Do not reuse used coolant.

♦

Only use water/coolant additive to lubricate the coolant hoses.

Coolant Mixture Ratio

Frost Protection

To

Portion of Cool‐

ant Additive

Coolant Ad‐

ditive 

1)

Distilled

Water 

1)

-25 °C

-36 °C (-13 °F

-32.8 °F)

40 %

50 %

3.2L

4.0L

4.8L

4.0L

1)

 The amount of coolant may vary depending on vehicle equip‐

ment.
• Coolant. Refer to the Parts Catalog.
Procedure