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Service bulletin WB9820

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 id603316
Published by NHTSA1999-02-17
Manufacturer's numberWB9820
Manufacturer's date1998-04-01
NHTSA componentENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN

NHTSA's summary

SUBJECT ON EVAPORATOR FAN SPEED CONTROL DIODE REMOVAL. *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, Cooling fan, Cooling system

Vehicles listed
PREVOST H3-401998
PREVOST H3-40VIP1998
PREVOST H3-411998
PREVOST H3-451998
PREVOST H3-45VIP1998

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