# Service bulletin Techtalk7921

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: 10184908
- Published by NHTSA: 2020\-12\-31
- Manufacturer's number: Techtalk7921
- Manufacturer's date: 2020\-12\-09
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

Tech Talk discussion on Fan Override Switch Install.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184908-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184908-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2020 WESTERN STAR 5700

## Other bulletins for the same vehicles and component

- [CXA\_10\_25\_Conmet Oil Pan](/bulletins/11024958.md), 2025-11-05, Other: ENGINE. CX Advocate for ConMet Oil Pan Insert Additional Issues
- [CXA 3\_25\_NOx](/bulletins/11016309.md), 2025-04-02, Other: ENGINE. CX Advocate for NOx conversion low faults
- [CXA 2\_25\_NOx](/bulletins/11014818.md), 2025-03-04, Other: ENGINE. CX Advocate for NOx conversion low faults
- [TSB01\-001\-DDC](/bulletins/11014775.md), 2025-03-04, Service bulletin: ENGINE. Technical Service Bulletin for GHG17 and Newer DD Platform Heavy Duty Oil Pan Drain Plug Inserts
- [CXA 1\_16\_NOx](/bulletins/11013204.md), 2025-01-29, Other: ENGINE. CX Advocate for NOx conversion low faults
- [CXA 1\_16\_CARB Truck Chec](/bulletins/11013196.md), 2025-01-29, Other: ENGINE. CX Advocate for CARB tightening the Readiness Criteria applied to On\-Board Diagnostic \(OBD\) test submissions for the Clean Truck Check.
- [CXA 11\_21\_CARB Truck Chec](/bulletins/11011082.md), 2024-12-04, Other: ENGINE. CX Advocate for CARB tightening the Readiness Criteria applied to On\-Board Diagnostic \(OBD\) test submissions for the Clean Truck Check.
- [WI24\-019](/bulletins/11011076.md), 2024-12-04, Warranty extension: ENGINE. Warranty Information letter for Detroit Line or Line Seal, High Pressure Fuel Injector Standard Repair Time Updates
- [CXA\_10\_17\_CARB Truck Chec](/bulletins/11010186.md), 2024-11-07, Other: ENGINE. CX Advocate for CARB tightening the Readiness Criteria applied to On\-Board Diagnostic \(OBD\) test submissions for the Clean Truck Check.
- [SS1023366\-Detroit](/bulletins/11010143.md), 2024-11-06, Other: ENGINE. Service Solution for Detroit Successful Regen Reference for GHG17 DD Engines

JSON: [/v1/bulletins/10184908](/v1/bulletins/10184908)

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