GM Service Manual Online
For 1990-2009 cars only

Buzz Noise or High Frequency Rattle Sound

Checks

Action

DEFINITION: A buzz or high frequency rattle

    • Trace Cooler Pipes
    • Check for binding or contact at the Radiator, other than at the Cooler Pipe connectors

Verify a pressure buzz by watching for a needle vibration of the pressure gage. A road test may be necessary. Refer to Road Test .