ID.4 2021 ➤, ID.5 2021 ➤
Maintenance - Edition 11.2021
4.23
Cooling system: checking frost protec‐
tion and coolant level
Note
♦ Due to the varying constitution of tap water in different coun‐
tries and regions, distilled water must be used for mixing
with coolant concentrate.
♦ Only use coolant additives approved for the vehicle ⇒ 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 motor.
♦ 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 motor
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.
♦ Anti-freeze protection must be guaranteed down to -25°C as
a minimum and, in countries with arctic conditions, down
to approx. -36°C. Increasing the anti-freeze protection is
permissible only if climatic conditions require stronger anti-
freeze protection. It may, however, be increased only to a
maximum of -48°C. Otherwise, the cooling effect will be im‐
paired.
♦ Do not reduce the coolant concentration by adding wa‐
ter even in warmer seasons and in warmer countries. An‐
4. Descriptions of work
47
ID.4 2021 ➤, ID.5 2021 ➤
Maintenance - Edition 11.2021
ti-freeze protection must be guaranteed down to at least
-25°C.
♦ The temperature reading on the refractometer corresponds
to the »ice flocculation point«. Flakes of ice may start form‐
ing in the coolant below this temperature.
♦ Do not reuse old coolant.
♦ Use only a water/coolant additive mixture as a slip agent for
coolant hoses.
4.23.1
Anti-freeze protection: checking, re‐
plenishing coolant additive if necessary
Special tools and workshop equipment required
♦ Refractometer -T10007A-
♦ Refractometer -T10007B-
Note
Read precise value for the following tests at light-dark border.
Using a pipette, place a drop of water on the glass to improve
the readability of the light-dark border. The light-dark border can
be clearly recognised on the “WATERLINE”.
– Check concentration of coolant additive using refractometer
(refer to operating instructions).
Scale -1- of the refractometer is calibrated for the coolant addi‐
tives G12++ and G12evo.
Scale -2- of the refractometer is calibrated for the coolant addi‐
tive G13.
– If anti-freeze protection is insufficient, drain some coolant
and top up with coolant additive ⇒ page 49 .
48
4. Descriptions of work
ID.4 2021 ➤, ID.5 2021 ➤
Maintenance - Edition 11.2021
Note
♦ If the currently used coolant additive cannot be determined
precisely, use the scale -2- for coolant additive G13.
♦ Please observe disposal instructions!
– Check coolant additive concentration after road test again.
4.23.2
Coolant level: checking, replenishing
coolant if necessary
– Check coolant level in coolant expansion tank with engine
cold.
♦ Delivery inspection: coolant level is at least at “MAX mark‐
ing”.
♦ During delivery inspection, coolant level above “MAX mark‐
ing” is permissible as well.
♦ The excessive amount of coolant does not need to be ex‐
tracted as the coolant level in new vehicles will decrease
after the system has been bled.
♦ Inspection: coolant level is above “min. marking”.
4.23.3
Mixing ratio
Frost protection to
Coolant additive
portion
Distilled water
-25°C
-36°C
approx. 40%
approx. 50%
approx. 60%
approx. 50%
4.24
Air conditioning system with heat
pump: renewing refrigerant R744
(CO )
2
Procedure
Note
♦ Valid for vehicles from production week 48/21►.
♦ The refrigerant circuit does not need to be cleaned.
♦ Purging refrigerant circuit
4. Descriptions of work
49
2024 VW ID.4 Owner's Manual
