Buzz Noise or High Frequency Rattle Sound

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

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 .