Tiguan 2016 ➤, Tiguan 2021 ➤, Tiguan RUS 2017 ➤, Tiguan RUS 2021 ➤
Maintenance - Edition 12.2020
4.26
Interior and exterior body: inspecting
for corrosion with doors and flaps open
Test locations
♦ Sliding sunroof frame
♦ Inner and outer door frame
♦ Area around trim strips
♦ Windscreen roof edge
♦ Outer and inner A-pillar
♦ Inner and outer bonnet
♦ Wheel arches
♦ Inner and outer tailgate
4.27
Poly V-belt: renewing
Procedure
⇒ Rep. gr. 13; Cylinder block belt pulley end; Removing and
installing poly V-belt
4.28
Poly V-belt: checking condition
Procedure
– Crank engine at vibration damper on pulley using a socket.
Check poly V-belt -1- for:
4. Descriptions of work
83
Tiguan 2016 ➤, Tiguan 2021 ➤, Tiguan RUS 2017 ➤, Tiguan RUS 2021 ➤
Maintenance - Edition 12.2020
♦ Sub-surface cracks (cracks, core ruptures, cross-sectional
breaks)
♦ Layer separation (top layer, cord strands)
♦ Base disruption
♦ Frayed cord strands
♦ Flank wear (material wear, frayed flanks, flank brittleness
-glassy flanks-, surface cracks)
NOTICE
•
•
If faults are found, it is absolutely necessary to renew the
poly V-belt.
In the case of diesel engines, toothed belts which came
into contact with oil, brake fluid, fuel or reducing agent,
must always be renewed.
•
In the case of petrol engines, toothed belts which came in‐
to contact with oil, brake fluid, fuel or coolant, must always
be renewed.
•
•
This can avoid breakdowns and malfunctions.
The replacement of a poly V-belt is a repair measure.
84
4. Descriptions of work
Tiguan 2016 ➤, Tiguan 2021 ➤, Tiguan RUS 2017 ➤, Tiguan RUS 2021 ➤
Maintenance - Edition 12.2020
4.29
Cooling system: checking frost protec‐
tion and coolant level
Note
♦ The water used for mixing has a major influence on the ef‐
fectiveness of the coolant. Because the water quality differs
from country to country and even from region to region, the
quality of the water to be used in the cooling system has
been specified by Volkswagen. Distilled water satisfies all
requirements. Therefore, only ever use distilled water when
mixing coolant for topping up or renewing coolant.
♦ Use only coolant additives which conform with the ⇒ Elec‐
tronic parts catalogue (ETKA). Other coolant additives may
reduce corrosion protection substantially. The resulting dam‐
age could lead to loss of coolant and subsequent severe
damage to the engine.
♦ Mixed in the proper proportions, coolant inhibits frost and
corrosion damage as well as scaling. Additives also raise the
boiling point of the coolant. Therefore, the cooling system
must be filled all year round with a coolant additive.
♦ Because of its high boiling point, the coolant improves en‐
gine reliability under heavy loads, particularly in countries
with tropical climates.
♦ The refractometer -T10007A- or refractometer -T10007B-
must be used to determine the current anti-freeze value.
♦ Scale -1- of the refractometer is calibrated for the coolant
additives G12++ and G12evo.
♦ Scale -2- of the refractometer is calibrated for the coolant
additive G13.
♦ If it is not possible to ensure that the same type of coolant
additive is filled: always determine anti-freeze protection us‐
ing the scale for G13.
♦ Frost protection must be guaranteed down to -25°C as a
minimum and, in countries with arctic conditions, down to
approx. -36°C. Increasing the frost protection is permissible
only if climatic conditions require stronger frost protection. It
may, however, be increased only to a maximum of -48°C.
Otherwise, the cooling effect will be impaired.
4. Descriptions of work
85
2024 VW Tiguan Owner's Manual
