GM Service Manual Online
For 1990-2009 cars only

Buzz Noise or High Frequency Rattle Sound

Checks

Action

    • Trace Cooler Pipes
    • Inspect 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 .