Ethylene glycol/water fill ratios have been established to ensure a minimum of 50 percent ethylene glycol in the coolant flush and drain procedure, and ensuring that all engine block drains and air bleeds were utilized.The cooling system capacity for the 3100 engine is 10.9 liters (11.6 quarts). The cooling system capacity for the 3800 engine is 10.1 liters (10.7 quarts). The coolant recovery reservoir capacity is 0.75 liters (0.80 quarts) to the COLD mark on the reservoir. The quantities listed in the filling procedure include the additional quantity to displace the air remaining in the coolant system after a static refill.Using the correct fill ratio and the following procedures will ensure a minimum concentration of 50 percent ethylene glycol in the coolant system and simplify the customer fill task. Refer to static fill radiator capacities. Every five years or 240,000 km, (150,000 miles), whichever occurs first, the cooling system should be drained and filled using the following recommended procedures.Caution: Refer to radiator cap Removal Caution in Service Precautions.Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL coolant. If Coolant other than DEX-COOL or HAVOLINE DEX-COOL is added to the system the engine coolant will require change sooner-at 50,000 km (30,000 mi) or 24 months.Draining Procedure Important: This procedure significantly increases the amount of used coolant and diluted hazardous waste.
Important: Recover coolant and store in a used coolant holding tank and submit the used coolant for recycling on a regular basis. This procedure significantly increases the amount of used coolant and diluted hazardous waste.
Filling Procedure Notice: DO NOT use cooling system seal tabs (or similar compounds) unless otherwise instructed. The use of cooling system seal tabs (or similar compounds) may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.