# Service bulletin SC\-23\-128

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: 11007756
- Published by NHTSA: 2024\-09\-13
- Manufacturer's number: SC\-23\-128
- Manufacturer's date: 2023\-09\-22
- Campaign id or software version: SC\-23\-128
- NHTSA component: ENGINE; FUEL/PROPULSION SYSTEM

## NHTSA's summary

The procedure describes the process of rerouting the rooftop coolant lines so the expansion tank is downstream of the HVAC chiller and lowers the pressure drop between expansion tank and pump inlet.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-11007756-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-11007756-9999.pdf)

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

## Components

Engine, Fuel system

## Vehicles listed

- 2022 to 2023 PROTERRA ZX5

JSON: [/v1/bulletins/11007756](/v1/bulletins/11007756)

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