My wife complained about the problem after we picked up the 07 Tahoe in August 2007, she did some research and found info on a Service Bulletin about Windshield Distortion ( she works for Harley Davidson in Warrenty Claims, so she knows where to look for stuff like this ). We printed it out and took it to the Chevy Dealership, we explained the problem and they read the Service Bulletin and replaced the windshield. Hope thie helps.
Make : CHEVROLET Model : TAHOE Year : 2007
Manufacturer : GENERAL MOTORS CORP.
Service Bulletin Num : 070848001 Date of Bulletin: FEB 01, 2007
NHTSA Item Number: 10021335
Component: VISIBILITY:WINDSHIELD
Summary:
FRONT WINDSHIELD GLASS OPTICAL DISTORTION OR STRESS CRACKS. *KB