# Service bulletin TMP500001.00

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: 11035222
- Published by NHTSA: 2026\-07\-25
- Manufacturer's number: TMP500001.00
- Manufacturer's date: 2026\-07\-31
- NHTSA component: ENGINE

## NHTSA's summary

This procedure defines the requirements and methodology for flushing and cleaning the driveline coolant circuits of an Enviro 500 DSL double deck bus, including the engine cooling circuit, gearbox cooling circuit, radiator, and header tank, following contamination by grease, oil, degraded coolant, or particulate matter.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11035222-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11035222-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2024 ALEXANDER DENNIS ENVIRO 500

JSON: [/v1/bulletins/11035222](/v1/bulletins/11035222)

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