GROUP

NUMBER

CAMPAIGN
DATE

Technical Service Bulletin
SUBJECT:

JULY, 2023

23-01-052H-1
MODEL(S)
TUCSON HYBRID
(NX4 HEV) &
SANTA FE
HYBRID (TM HEV)

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT
CHANGE (SERVICE CAMPAIGN T9L)

This TSB supersedes 23-01-052H to an updated coolant specification (LLC-10) on page 2. In
addition, it also supersedes existing TSB 22-HC-002H.

 IMPORTANT
Dealers must perform this service campaign on all affected vehicles prior to customer retail
delivery and whenever an affected vehicle is in the shop for any maintenance or repair.
Access the “Vehicle Information” screen via WEBDCS to identify open campaigns.
DESCRIPTION: This bulletin provides information related to the cleaning of the cooling system and
coolant change to address the following problem:
• “Refill Inverter Coolant” warning light displayed on the cluster
• No DTC’s present
• Normal level of coolant in Inverter Reservoir Tank
• Measured EWP Speed > 2,800 RPM
The cause of the warning light is due to increased EWP Speed due to poor flow of coolant inside the
cooling circuit. The coolant in the system will be discharged and any foreign substances in the
circuit will be flushed out with new coolant added in the end. A new reservoir cap label will be
added.
STUI
This TSB includes Repair validation photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.

APPLICABLE VEHICLES (Certain):
• 2022MY Tucson Hybrid (NX4 HEV) equipped with 1.6L Gamma II turbocharged engines and
produced from 01/21/2021– 10/30/2021.
• 2021-22MY Santa Fe Hybrid (TM HEV) equipped with 1.6L Gamma II turbocharged engines
and produced 12/18/2020 – 09/27/2021.

Circulate To: Service Manager, Warranty Manager, Service Advisors, Technicians, Fleet Repair

SUBJECT:

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9L)

Information

i
•
•
•

To ensure proper understanding of the service procedure and equipment
connections, it is recommended to view or print this bulletin in color.
When working on the vehicle, ensure to disconnect the high voltage system and
wear protective eye safety goggles to avoid injury from coolant leaks under
pressure.
To securely connect the equipment hoses, use existing coolant hose clamps at the
identified locations on the vehicle as the equipment flushes coolant under pressure.

PARTS INFORMATION:
Part Name

Part Number

Quantity

Coolant (LLC-10)

00232-19098

1 gal.

Reservoir Cap Label

25328-B1000QQH

1

SST INFORMATION:
Tool Name
Coolant Flushing
Equipment Set

Figure

Part Number

Quantity

Remarks

KQ253CV158QQH

1

Each dealer will be shipped
one free of charge

TSB #: 23-01-052H-1

Page 2 of 11
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SUBJECT:

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9L)

WARRANTY INFORMATION:
Model

Causal Part

Op Time

COOLING SYSTEM
CIRCUIT DEBRIS
DISCHARGE,
COOLANT CHANGE,
AND RESERVOIR CAP
Santa Fe Hybrid
LABEL
20D142R3
(TM HEV)
REPLACEMENT

25328B1000QQH

0.7 M/H

Tucson Hybrid
(NX4 HEV) &
20D142R5
Santa Fe Hybrid
(TM HEV)

25328B1000QQH

Tucson Hybrid
(NX4 HEV)

Op Code

Operation

Nature
Code

Cause
Code

E83

ZZ5

20D142R1

COOLANT CHECK
ONLY

0.3 M/H

NOTE 1: Submit claim on Claim Entry Screen as “Campaign” type.
NOTE 2: If a part that is not covered by this campaign is found in need of replacement
while performing the Service Campaign and the affected part is still under warranty, submit
a separate claim using the same repair order. If the affected part is out of warranty, submit
a Prior Approval request for goodwill consideration prior to the repair.
NOTE 3: This TSB includes Repair validation photos. Op times include VIN, Mileage and
Repair validation photos as outlined in the Digital Documentation Policy.

COOLANT FLUSH AND FILTER EQUIPMENT OPERATING INSTRUCTIONS:
TSB #: 23-01-052H-1

Page 3 of 11
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SUBJECT:

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9L)

1. Air Draining (Coolant discharge)
a. When discharging the remaining coolant using air, turn off the coolant pump
and close the inlet valve. (If the inlet valve is opened, the air may flow back
and the remaining coolant may not be recovered.)
b. Equipment setting condition:
i. Air ‘ON’, Pump ‘OFF’, Inlet valve ‘OFF’

c. The air pressure can be adjusted up to 3 bar to achieve desired draining
performance.
2. Coolant Cleaning (Flushing and filtering of the vehicle’s coolant circuit)
a. Equipment setting condition:
i. Pressure 2 bar, Air ‘ON’, Pump ‘ON’, Inlet valve ‘ON’

TSB #: 23-01-052H-1

Page 4 of 11
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SUBJECT:

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9L)

CAUTION

!

The coolant circulation container must always have 8L (about half of the reservoir bottle) of either
tap water, distilled water or coolant (blue BSC-2) that was discharged from the previous vehicle.
Never use salty or light water in the coolant circulation container.

•

For cleaning equipment, make sure to turn on the water pump first and then turn on the air.
After turning on the air, visually check whether the air comes out from the end of the inlet of
the equipment. When air does not come out, operate the air pressure valve to increase the
pressure a little to check that air comes out and set it to 2 bar.

•

Please ensure that only Blue Coolant (BSC-2) is used in the Coolant Flushing
Equipment Set when flushing the system. Disconnect the Coolant Flushing
Equipment Set before filling vehicle systems with Pink Coolant (LLC-10). This
ensures that no Pink Coolant is mixed with the Blue Coolant.

TSB #: 23-01-052H-1

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SUBJECT:

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9L)

NOTICE
After one cleaning operation is completed, clean the filter & filter case of the equipment with an
air gun to remove foreign substances.
• Ensure to remove as much of the foreign substances as possible.
• A poorly cleaned filter can result in decreased flow rate and degrade the cleaning effect
of the cleaning machine.

•

Sludge can get stuck to the inner wall of the filter gaps, be sure to clean the filter evenly.

! WARNING
•
•

When working on the high voltage system, make sure that you are familiar and comply with
the "Safety Precautions, Cautions and Warnings." If you do not comply with the instructions,
death or serious injury due to electric shock or leakage may occur.
When working on the high voltage system, make sure to cut off the high voltage first
according to the "High Voltage Cut-off Procedure." If you do not comply with the
instructions, death or serious injury due to electric shock or leakage may occur.

CAUTION

!
•

Be sure to wear sufficient eye protection (safety goggles) when connecting or disconnecting
hoses to the vehicle and when operating the coolant cleaning equipment until you have
verified coolant discharge and cleaning is operating properly. An accidental discharge may
occur and fluid may enter your eyes if you do not follow this precaution.

TSB #: 23-01-052H-1

Page 6 of 11
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SUBJECT:

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9L)

VEHICLE SERVICE PROCEDURE – DEBRIS DISCHARGE AND COOLANT CHANGE

1. Check for blue coolant inside the inverter
reservoir tank. (Keep hood opened)

!

CAUTION

Do not proceed with the operation on pink
coolant vehicles.
If pink coolant is found, proceed to Step 17.

A

2. Using the GDS under “Data Analysis”, monitor the
initial RPM of the EWP when starting vehicle to
confirm Refill Inverter Coolant warning.
- Spec is 2,000 – 2,800 RPM
- “Refill Inverter Coolant” displayed above 2,800
RPM.
3. Turn off the vehicle and remove the service
interlock connector (A).
4. Remove the reservoir tank cap (B) then remove
the coolant from inside the tank using the Siphon
Pump Hose.
- Use a bucket to catch the coolant that comes out
from the discharge side of the Siphon Pump Hose as
seen in the photo.

B

Siphon Pump Hose

TSB #: 23-01-052H-1

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SUBJECT:

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9L)

5. Disconnect the two hoses from the reservoir tank
and connect them to the cleaning equipment as
follows:
- Circulation inlet hose Blue to the hose located
on the left side of the reservoir tank.
- Circulation outlet hose Red to the hose located
on the right side of the reservoir tank.
- Circulate coolant and air to perform a 3-minute
cleaning.
6. While the cleaning equipment is in operation,
remove the reservoir tank to clean the residual
coolant and debris inside.
- Use tap or distilled water to flush out thoroughly
ensuring there is no blue coolant residual visible.
- Once thoroughly flushed out, use an air tool to
dry out the reservoir.

B
Circulation
outlet (hose)

Circulation
inlet (hose)

7. After 3 minutes, turn off the coolant pump in the
cleaning equipment and allow air to blow through the
system for 30 seconds. Turn off the air to the
cleaning equipment.

Outlet

Inlet
Coolant
circulation
container

Coolant pump
and air
pressurizer

Foreign material

TSB #: 23-01-052H-1

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COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9L)

8. Reverse the hose connections from step 5.
- Circulation outlet hose Red to the hose located
on the right side of the reservoir tank.
- Circulation inlet hose Blue to the hose located
on the left side of the reservoir tank. - Circulate
coolant and air to perform a 3-minute cleaning.
9. Repeat operation 7.
- After 3 minutes, turn off the coolant pump in the
cleaning equipment and allow air to blow through
the system for 30 seconds. Turn off the air to the
cleaning equipment.

B
0

Circulation inlet
(hose)

Circulation
outlet
(hose)

10. Repeat operation 5.
- Circulation inlet hose Blue to the hose located
on the left side of the reservoir tank.
- Circulation outlet hose Red to the hose located
on the right side of the reservoir tank.
- Circulate coolant and air to perform a 3-minute
cleaning.
11. After 3 minutes, turn off the coolant pump in the
cleaning equipment and allow air to blow through the
system for 1 minute. Turn off the air to the cleaning
equipment.
12. Confirm that all coolant hoses are properly
installed and inject coolant (LLC-10) into vehicle.
- Reconnect the Service Interlock Connector (A)
-Use the GDS under Actuation Test to manually
turn on EWP to aid in air bleeding during coolant
injection.
NOTE
- Coolant concentration (coolant: diluted water):
6:4
- Coolant injection: 1.9 liters (coolant + diluted
water)
- If there is a large amount of low-conductivity
coolant (blue) remaining inside the vehicle, the
color of the newly injected pink coolant may
change to murky. In this case, drain all coolant
inside the vehicle and re-inject normal (pink)
coolant.

TSB #: 23-01-052H-1

Outlet

Inlet
Coolant
circulation
container

Coolant pump
and air
pressurizer

Foreign material

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SUBJECT:

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9L)

13. Replace the inverter reservoir tank cap label.
- Use a cutter knife to remove the old label and
affix the new label.

14. Turn the vehicle on into “Ready” mode and
confirm that the phrase “Refill Inverter Coolant” is not
shown on the cluster.
- If the message is shown, repeat the flush
procedure starting from Step 1.
- If the message is not shown, proceed to the next
step.

Existing

New label

15. Clean the filter & filter case of the equipment with
the air gun to remove foreign substances.
• Ensure to remove as much of the foreign
substances as possible.
• A poorly cleaned filter can result in decreased
flow rate and degrade the cleaning effect of the
cleaning machine.
• Sludge can get stuck to the inner wall of the
filter gaps, be sure to clean the filter evenly.

TSB #: 23-01-052H-1

Page 10 of 11
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SUBJECT:
16.

COOLING SYSTEM CIRCUIT DEBRIS DISCHARGE AND COOLANT CHANGE (SERVICE CAMPAIGN T9L)

STUI
Using STUI, photograph the
reservoir showing Pink LLC-10
Coolant along with the last 6
digits of the VIN and the date of
the repair on a piece of paper.
Upload the photo to STUI.

17. End of Service Procedure.

TSB #: 23-01-052H-1

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