The cooling system maintains an efficient engine temperature level during all engine operating conditions.

The cooling system consists of the following components:

The coolant pump draws coolant from the radiator and circulates the coolant through coolant jackets in the engine cylinder block and the cylinder heads. The coolant is then directed back to the radiator.

The system directs some coolant through hoses to the heater core in order to provide for defrost and passenger compartment heat. A surge tank connects to the cooling system. Pressurized coolant continuously flows through the surge tank.

This switch activates a warning lamp in the instrument cluster if the engine overheats. With optional instrumentation, a temperature gauge replaces the warning lamp. A transducer drives the temperature gauge. You cannot service the engine coolant temperature sensor. If the sensor is faulty, replace the sensor. Refer to Electrical Diagnosis for diagnosis and the location of the temperature switch.

This vehicle has a low coolant warning switch. This switch is in the radiator surge tank. Refer to Electrical Diagnosis for diagnosis.

Air deflectors are used on various models to direct air to the condenser fan radiator module. Air seals are used on various models to ensure that air passes through the radiator and the A/C condenser, rather than bypassing the radiator. Air baffles are installed on various models to direct air into the radiator or the A/C condenser. A missing, damaged, or incorrectly installed baffle may cause the engine to overheat.

This vehicle was manufactured with GM Goodwrench DEX-COOL™. GM Goodwrench DEX-COOL™ was developed to last for 240 000 km (150,000 mi) or 5 years, whichever occurs first. Make sure only GM Goodwrench DEX-COOL™ (orange-colored, silicate-free) is used when coolant is added or changed. Follow the instructions in Draining/Filling Cooling System.

Notice: Pure coolant can be added to raise the boiling point of the coolant, but too much will affect the freezing point. Do not use a solution stronger than 70 percent, as the freeze level rises rapidly after this point. Pure coolant will freeze at -22°C (-8°F).

A 50/50 mixture of ethylene glycol (GM Goodwrench DEX-COOL™) and water will provide the following protection: