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Service bulletin SIL 644

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 id10122051
Published by NHTSA2017-11-08
Manufacturer's numberSIL 644
Manufacturer's date2017-09-29
NHTSA componentEQUIPMENT:APPLIANCE:AIR CONDITIONER

NHTSA's summary

This service information letter (SIL) requires the compressor for the HVAC system be recharged and a fuse in the system be replaced. Some units had compressors' that were over charged causing the AC system not to properly operate.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Equipment and accessories, Heating and air conditioning

Vehicles listed
ALTEC AA

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