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Reports that some 1999-2001 GM 2.2L VIN 4 engines tend to generate a droning noise that is especially noticeable at approximately 950 rpm after cold start up.

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Engine Builders: There have been reports that some 1999-2001 GM 2.2L VIN 4 engines tend to generate a droning noise that is especially noticeable at approximately 950 rpm after cold start up.

GM has identified the source as a natural resonant vibration of the air conditioning alternator drive belt. A revised belt, p/n 12575450, made of a different material may reduce or eliminate the noise.

Engine Builders: The AERA Technical Committee offers the following cylinder head gasket and cylinder liner protrusion caution on 1958-

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