Buzz Noise or High Frequency Rattle Sound. GMC Truck Envoy

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2007 🢒 Envoy - 2WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E/4L65-E/4L70-E 🢒 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 .