Engine Block Heater: Service Precautions

NOTICE: When adding coolant, use DEX-COOL TM (orange-colored, silicate-free) coolant meeting GM Specification 6277M. If silicate coolant is added to the system, premature engine, heater core, or radiator corrosion may result. In addition, the engine coolant will require change sooner - at 50 000 km (30,000 miles) or 24 months.