NHTSA ID Number: 11033845
Manufacturer Communication Number: 26-HA-002G TSB
TSB/Document Date: 2026-06-16
Summary
Some Genesis
vehicles (listed below) equipped with Lambda-III 3.5T-GDI engines may exhibit reduced heater performance due to engine coolant deposits clogging the heater core. This bulletin provides instructions to verify the concern and to replace the front and rear heater core (if applicable).
GROUP
NUMBER
HVAC
26-HA-002G
DATE
Technical Service Bulletin
SUBJECT:
MODEL(S)
JUNE 2026
SEE BELOW
REDUCED HEATER PERFORMANCE – TEMPERATURE CHECK &
HEATER CORE REPLACEMENT
This TSB supersedes 24-HA-001G to revise the “Applicable Vehicles” section on page 1.
Description: Some Genesis vehicles (listed below) equipped with Lambda-III 3.5T-GDI engines may
exhibit reduced heater performance due to engine coolant deposits clogging the heater core.
This bulletin provides instructions to verify the concern and to replace the front and rear heater core
(if applicable).
Applicable Vehicles:
Model Year
Model
Engine
2021 – 2025
G80 (RG3)
07/25/2020 – 02/15/2025
2023 – 2025
G90 (RS4)
04/21/2022 – 02/21/2025
2022 – 2026
GV70 (JK1)
2024 – 2026
GV70 (JK1A)
05/25/2023 – 06/11/2025
2021 – 2025
GV80 (JX1)
10/16/2020 – 04/03/2025
Lambda III 3.5T-GDI
Production Dates
03/10/2021 – 03/20/2025
Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors, Technicians, Body Shop Manager, Fleet Repair
SUBJECT:
REDUCED HEATER PERFORMANCE
– TEMPERATURE CHECK & HEATER CORE REPLACEMENT
Parts Information:
Model
Part Name
Part Number
Coolant
Capacity*
Remarks
G80 (RG3)
97138-T1000QQH
–
G90 (RS4)
97138-T4000QQH
–
97138-AR000QQH
–
GV70 (JK1, JK1A)
GV80 (JX1)
(5-Passenger)
Front Heater Core
97138-T6000QQH
GV80 (JX1)
(7-Passenger)
GV80 (JX1)
(7-Passenger)
Rear Heater Core
–
Qty: 1
97138-T6300QQH
–
97138-T6500QQH
–
G80 (RG3)
11.6 Quarts
G90 (RS4)
GV70 (JK1, JK1A)
GV80 (JX1)
(5-Passenger)
Pink Coolant
00232-19098WAR
GV80 (JX1)
G80 (RG3)
G90 (RS4)
10.4 Quarts
10.2 Quarts
11.6 Quarts
GV80 (JX1)
(7-Passenger)
All Models
Coolant Qty:
6 Quarts
Front Pillar Trim
Mounting Clip
Front Pillar
Fastener Clip
GV70 (JK1, JK1A)
85815-C1100
82315-2W000
Coolant Qty:
9 Quarts
16.4 Quarts
Qty: 2
-
Qty: 2
-
-
82315-2P000
All Models
Steering Wheel
Lock Bolt
56115-B1000
Qty:1
All Models
97141-4H900
Qty: 2
*NOTE: Do NOT use 100% full strength anti-freeze. Prepare coolant mixed with distilled/filtered water
to refill the cooling system. (55 - 60% antifreeze, diluted with 40 - 45% distilled water)
Required Equipment/Supplies:
Name
Figure
Thermometer
Remarks
Standard Shop Supply
Examples Include:
• Outset F800 or Taylor Instant-Read Digital Thermometer
• ThermoPro or KIZEN Infrared Thermometer Temperature Gun
TSB #: 26-HA-002G
Page 2 of 12
SUBJECT:
REDUCED HEATER PERFORMANCE
– TEMPERATURE CHECK & HEATER CORE REPLACEMENT
Warranty Information:
Model
Op.
Time
Causal Part
0.3 M/H
97138-T1000 (RG3)
97138-T4000 (RS4)
97138-AR000
(JK1 / JK1A)
97138-T6000 (JX1 5P)
Op. Code
Operation
G80 (RG3),
G90 (RS4),
GV70 (JK1, JK1A),
GV80 (JX1)
(5-Passenger)
40D158R0
Front Heater
Performance
Inspection
GV80 (JX1)
(7-Passenger)
40D158R1
Front and Rear
Heater Performance 0.4 M/H
Inspection
97138-T6300
G80 (RG3)
40D158R2
5.2 M/H
97138-T1000
G90 (RS4)
40D158R3
97138-T4000
GV70 (JK1)
40D158R4
97138-AR000
GV70 (JK1A)
40D158R5
5.4 M/H
Front Heater
Performance
Inspection and Front 5.1 M/H
Heater Core
5.1 M/H
Replacement
GV80 (JX1)
(5-Passenger)
40D158R6
5.0 M/H
97138-T6000
40D158R7
Front and Rear
Heater Performance
Inspection and Front 5.1 M/H
Heater Core
Replacement
97138-T6300
40D158R8
Front and Rear
Heater Performance
Inspection and Rear 2.1 M/H
Heater Core
Replacement
97138-T6500
40D158R9
Front and Rear
Heater Performance
Inspection and Front 6.1 M/H
and Rear Heater
Core Replacement
97138-T6300
GV80 (JX1)
(7-Passenger)
Nature
Code
Cause
Code
IB2
ZZ3
97138-AR000
NOTE 1: Submit a campaign claim on the "Claim Entry/Edit/Submit" screen on WebDCS and attach
all required Digital Documentation per TSB to the claim.
NOTE 2: If any part(s) not subject to this TSB are found in need of replacement while performing the
repair procedure, and the affected part(s) are still under warranty, the retailer may submit a separate
claim using the same repair order. If the part(s) not subject to this TSB are out of warranty coverage,
the retailer has the option to submit a PA Request for goodwill consideration on a case-by-case basis.
NOTE 3: This TSB includes repair justification photos. Op times include VIN, mileage, and repair
justification photo(s) as outlined in the Digital Documentation Policy.
NOTE 4: The incident parts are subject to callback through the normal Warranty Technical Center
(WTC) parts return process. Claim is subject to debit if the part is not returned.
TSB #: 26-HA-002G
Page 3 of 12
SUBJECT:
REDUCED HEATER PERFORMANCE
– TEMPERATURE CHECK & HEATER CORE REPLACEMENT
Service Procedure:
DIGITAL DOCUMENTATION
This TSB includes repair justification photos. Refer to the latest Warranty Digital Documentation
Policy for requirements.
NOTICE
Applying the recommended torque to all fasteners is essential to reduce potential issues from
occurring after the service procedure.
Table of Contents
•
Flowchart ..................................................................................................................................4
•
Heater Temperature Difference Check - Preparation ...............................................................5
•
Heater Temperature Difference Check and Heater Core Replacement - G80 (RG3),
G90 (RS4), GV70 (JK1, JK1A), GV80 (JX1, 5-Passenger) ......................................................7
•
Heater Temperature Difference Check and Heater Core/Rear Heater Core
Replacement - GV80 (JX1, 7-Passenger) ...............................................................................9
Flowchart
Vehicle In
Less Than 18°F
Front & Rear*
Heater Temperature
Difference Check
18°F or More
Heater Core
Replacement
(Front and/or Rear*)
and Air Bleeding
Vehicle Out
*If applicable
TSB #: 26-HA-002G
Page 4 of 12
SUBJECT:
REDUCED HEATER PERFORMANCE
- Unsurpassed freeze protection and anti-boil performance...
- Organic acid technology resists rust, scale & corrosion...
- High-quality additives protect against leaks and won’t...
- Pre-mixed orange formula is ready-to-use in a 50/50 ratio...
- 5 year/150,000 mile guarantee protects against engine...
- Formulated to replace the OEM fluid in Asian make vehicles...
- 5 year/150, 000 mile . Silicate-free, long-life, phosphate...
- The long life formula provides protection for all cooling...
- Meets the following OEM and industry specifications: JIS K...
- Note: Please check the vehicle specification before...
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TSB/Document ID: 26-HA-002G TSB
Replacement Service Bulletin Number:
MFR Communication Date: 2026-06-10
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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