# Service bulletin SC373\_TSB

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11036626
- Published by NHTSA: 2026\-09\-02
- Manufacturer's number: SC373\_TSB
- Manufacturer's date: 2026\-08\-21
- Campaign id or software version: SC373
- NHTSA component: VISIBILITY/WIPER; ENGINE

## NHTSA's summary

TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN: 3\-WAY COOLANT VALVE REPLACEMENT \(SC373\) \- This bulletin provides information to replace the 3\-way coolant valve. In addition, inspect the 3\-way coolant valve harness connector for corrosion, and if necessary, replace the harness connector on certain 2024\-2026MY EV6 \(CV, CVa\) vehicles produced from August 07, 2023 through June 18, 2026. The 3\-way coolant valve in the subject vehicles may become damaged and result in a coolant leak. As a result, corrosion may also be present in the 3\-way coolant valve harness connector. An inoperative 3\-way coolant valve or corrosion within the harness connector may result in reduced Heating, Ventilation, and Air Conditioning \(HVAC\) performance and/or in the illumination of the “Check electric vehicle system” or “Refill Coolant” warning messages in the instrument cluster.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036626-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036626-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Glass, wipers and mirrors, Wipers and washers

## Vehicles listed

- 2024 to 2026 KIA EV6

## Other bulletins for the same vehicles and component

- [SC373B\_OWNR](/bulletins/11037608.md), 2026-09-30, Service campaign: ENGINE; VISIBILITY/WIPER. VOLUNTARY SERVICE CAMPAIGN: OWNER NOTIFICATION \(SC373B\) \- This document is the owner notification advising that Kia is conducting a Voluntary Service Campaign on certain 2024\-2026 MY EV6 vehicles to replace the 3\-way coolant valve assembly with a new one. In addition, dealers will inspect the 3\-way coolant valve harness connector for corrosion and, if necessary, replace the harness connector.
- [SC373\_TSB\_R2](/bulletins/11037607.md), 2026-09-30, Service bulletin: ENGINE; VISIBILITY/WIPER. TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN: 3\-WAY COOLANT VALVE REPLACEMENT \(SC373 Revision 2\) \- This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information to replace the 3\-way coolant valve. In addition, inspect the 3\-way coolant valve harness connector for corrosion, and if necessary, replace the harness connector on certain 2024\-2026MY EV6 \(CV, CVa\) vehicles produced from August 07, 2023 through June 18, 2026. The 3\-way coolant valve in the subject vehicles may become damaged and result in a coolant leak. As a result, corrosion may also be present in the 3\-way coolant valve harness connector. An inoperative 3\-way coolant valve or corrosion within the harness connector may result in reduced Heating, Ventilation, and Air Conditioning \(HVAC\) performance and/or in the illumination of the “Check electric vehicle system” or “Refill Coolant” warning messages in the instrument cluster.
- [SC373\_TSB\_R1](/bulletins/11037606.md), 2026-09-30, Service bulletin: ENGINE; VISIBILITY/WIPER. TECHNICAL SERVICE BULLETIN: VOLUNTARY SERVICE CAMPAIGN: 3\-WAY COOLANT VALVE REPLACEMENT \(SC373 Revision 1\) \- This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information to replace the 3\-way coolant valve. In addition, inspect the 3\-way coolant valve harness connector for corrosion, and if necessary, replace the harness connector on certain 2024\-2026MY EV6 \(CV, CVa\) vehicles produced from August 07, 2023 through June 18, 2026. The 3\-way coolant valve in the subject vehicles may become damaged and result in a coolant leak. As a result, corrosion may also be present in the 3\-way coolant valve harness connector. An inoperative 3\-way coolant valve or corrosion within the harness connector may result in reduced Heating, Ventilation, and Air Conditioning \(HVAC\) performance and/or in the illumination of the “Check electric vehicle system” or “Refill Coolant” warning messages in the instrument cluster.
- [TSB\_CLI049\_R2](/bulletins/11036628.md), 2026-09-02, Service bulletin: ELECTRICAL SYSTEM; VISIBILITY/WIPER. TECHNICAL SERVICE BULLETIN: PARTIAL REPAIR – ELECTRICAL A/C COMPRESSOR \- This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information regarding the partial repair of the Air Conditioning \(A/C\) compressor assembly on some 2011MY\~ Optima Hybrid \(TF HEV, JF HEV/PHEV\), 2015MY\~ Soul EV \(PS EV\), 2017MY\~ Niro \(DE HEV/PHEV/EV\), 2022MY\~ EV6 \(CV\), 2021MY\~ Sorento \(MQ4 HEV/PHEV\), 2023MY\~ Sportage \(NQ5 HEV/PHEV\), and 2023MY\~ Niro \(SG2 EV/HEV/PHEV\) vehicles.
- [SC373A\_OWNR](/bulletins/11036627.md), 2026-09-02, Service campaign: VISIBILITY/WIPER; ENGINE. VOLUNTARY SERVICE CAMPAIGN: OWNER NOTIFICATION \(SC373A\) \- This document is the owner notification advising that Kia is conducting a Voluntary Service Campaign on certain 2024\-2026 MY EV6 vehicles to replace the 3\-way coolant valve assembly with a new one. In addition, dealers will inspect the 3\-way coolant valve harness connector for corrosion and, if necessary, replace the harness connector.
- [SC373\_QA](/bulletins/11036316.md), 2026-08-21, Service campaign: VISIBILITY/WIPER; ENGINE. VOLUNTARY SERVICE CAMPAIGN: QUESTION AND ANSWER \(SC373\) \- This document is the Question and Answer Guide containing the most frequently asked questions regarding the Voluntary Service Campaign SC373.
- [SC373\_DPSM](/bulletins/11036315.md), 2026-08-21, Service campaign: ENGINE; VISIBILITY/WIPER. VOLUNTARY SERVICE CAMPAIGN:DEALER PARTS AND SERVICE MANAGER MEMO \(SC373\) \- This document is the announcement to the dealer Parts and Service managers advising that Kia is conducting a Voluntary Service Campaign on certain 2024\-2026 MY EV6 vehicles, manufactured from August 7, 2023 through June 18, 2026, to replace the 3\-way coolant valve assembly with a new one. In addition, dealers will inspect the 3\-way coolant valve harness connector for corrosion and, if necessary, replace the harness connector.
- [SC373\_DP](/bulletins/11036314.md), 2026-08-21, Service campaign: ENGINE; VISIBILITY/WIPER. VOLUNTARY SERVICE CAMPAIGN: DEALER PRINCIPAL MEMO \(SC373\) \- This document is the announcement to the dealer principals advising that Kia is conducting a Voluntary Service Campaign on certain 2024\-2026 MY EV6 vehicles, manufactured from August 7, 2023 through June 18, 2026, to replace the 3\-way coolant valve assembly with a new one. In addition, dealers will inspect the 3\-way coolant valve harness connector for corrosion and, if necessary, replace the harness connector.

JSON: [/v1/bulletins/11036626](/v1/bulletins/11036626)

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