# Service bulletin 22\-HC\-002H

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: 10218637
- Published by NHTSA: 2022\-08\-24
- Manufacturer's number: 22\-HC\-002H
- Manufacturer's date: 2022\-08\-04
- NHTSA component: POWER TRAIN; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

## NHTSA's summary

This bulletin addresses a warning light “Refill Inverter Coolant” displayed on the instrument cluster, but inspection of the under hood blue coolant reservoir is found to be at normal level \(not below “MIN” marking on the reservoir bottle\). This may be caused by poor flow of antifreeze inside the low\-conductivity coolant pipe from internal debris, resulting in unusual high EWP operation being detected. Follow the procedure outlined in this bulletin to flush/discharge debris from the cooling system and replace the blue coolant. To effectively resolve, the flushing must be performed section by section as instructed. After flushing of the cooling system is done, updated BSC\-2 coolant will be installed.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10218637-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10218637-9999.pdf)

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

## Components

Electrical system, Transmission and driveline, Instrument cluster

## Vehicles listed

- 2021 HYUNDAI SANTA FE
- 2022 HYUNDAI SANTA FE HYBRID
- 2022 HYUNDAI TUCSON HYBRID

## Recalls for the same vehicles and component

- [21V00K000](/recalls/nhtsa/21V00K000.md), 2021-12-28: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

JSON: [/v1/bulletins/10218637](/v1/bulletins/10218637)

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