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Air Pump
- Accelerate engine to approximately 1500 RPM and observe airflow from hoses. If airflow increases as engine is accelerated, pump is operating satisfactorily. If it does not increase, or is not present, proceed to next step.
Courtesy of GENERAL MOTORS COMPANY
- Check for proper pump belt tension, leaky valves, seized pump, or improperly routed or disconnected hoses.
NOTE:
Do not oil air pump. Also note that air pump system is not completely noiseless.