GM Service Manual Online
For 1990-2009 cars only

Problem

Action

The pump belt is slipping.

Refer to Drive Belt Replacement in Engine Mechanical 2.2L or Drive Belt Replacement in Engine Mechanical 4.3L.

The drive belt tensioner is weak.

Refer to Drive Belt Tensioner Diagnosis in Engine Mechanical 2.2L or Drive Belt Tensioner Diagnosis in Engine Mechnical 4.3L.