# Service bulletin S24DG

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: 11010783
- Published by NHTSA: 2024\-11\-25
- Manufacturer's number: S24DG
- Manufacturer's date: 2024\-11\-25
- Campaign id or software version: S24DG
- NHTSA component: ENGINE

## NHTSA's summary

The 7.3L radiator uses adapter nuts, if not properly sealed, exposes the opportunity for fluid migration through threads. Primary failure seen is deterioration of the EPDM gasket sealing the transmission oil cooler \(TOC\) to lower radiator tank, which allows a path for coolant to leak externally. Secondary failure seen is cross contamination between coolant and transmission oil. To eliminate the possibility of experiencing this condition, Blue Bird is providing 1 year of coverage to update the transmission oil cooler interface along with a visual inspection of any cross contamination at time of completing the interface update. Please follow the flowchart within the instructions to determine if any additional repair activity is necessary and, if so, complete further repair procedures as stated.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-11010783-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-11010783-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2023 to 2025 BLUE BIRD VISION SCHOOL BUS
- 2023 to 2025 BLUE BIRD VISION TRANSIT BUS

JSON: [/v1/bulletins/11010783](/v1/bulletins/11010783)

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