See also:

Vehicle and Power Issues
OnStar services require a vehicle electrical system, wireless service, and GPS satellite technologies to be available and operating for features to function properly. These systems may not o ...

Sending a Number During a Call
1. Press . The system responds with “Ready” followed by a tone. 2. Say “Dial”. The system responds with “Say a number to send tones” followed by a tone. 3. Say the number to send. ...

What to Use
Use a mixture of one-half clean, drinkable water and one-half DEX-COOL® coolant. If you use this coolant mixture, you do not need to add anything else. CAUTION: Adding only plain water to your ...