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Service bulletin 15811

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 id10090382
Published by NHTSA2017-02-03
Manufacturer's number15811
Manufacturer's date2016-03-22
NHTSA componentENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS

NHTSA's summary

15811 - SERVICE UPDATE. SOME VEHICLES EQUIPPED WITH A 1.6L ENGINE (RPO LWC) MAY HAVE A CHAFING CONDITION OF THE CHARGE AIR COOLER OUTLET AIR HOSE ON THE UPPER VACUUM PUMP STUD. DEALERS ARE TO REPLACE THE UPPER VACUUM PUMP STUD WITH A FASTENING BOLT .

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 system

Vehicles listed
BUICK CASCADA2016

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

Other bulletins for the same vehicles and component
PIP5684B2020-08-10. Service bulletin. This Preliminary information communicates the use of air leak diagnostic test tool CH-52250 in addition to the information found in the service manual.
19NA1042019-07-29. Service bulletin. This informational bulletin provides information for dealers/technicians and customers on steam/vapor coming from the front grille or radiator area.