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Service bulletin 203020

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id603952
Published by NHTSA1999-03-12
Manufacturer's number203020
Manufacturer's date1999-01-01
NHTSA componentENGINE AND ENGINE COOLING:ENGINE:DIESEL

NHTSA's summary

THE RETROFIT OF COOLANT PREHEATERS (ENGINE BLOCK HEATERS) IS NOW AVAILABLE. *YC

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Vehicles listed
MERCEDES BENZ 129
MERCEDES BENZ 202
MERCEDES BENZ 208

Listing a model year does not mean every vehicle of it is concerned: the document says which.