![]() Start the engine and allow the engine cooling fan to cycle on and off 3 times.Important: If the coolant temperature indicator turns ON, turn the engine OFF immediately and allow the engine to cool. Caution: Refer to Radiator Cap Removal Caution in Service Precautions. Fill the coolant reservoir with a 50/50 mixture of GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL and clean, drinkable water.Close the air bleed valve on the thermostat housing.Close the air bleed valve above the coolant pump.Do NOT over-tighten the air bleed valves. Install the radiator cap.Ensure that the radiator cap arrow points toward the radiator overflow tube Important: The air bleed valves are brass.If necessary, add coolant to the radiator until the coolant level is at the base of the radiator fill neck. Wait for 2 minutes and reinspect the level of the coolant in the radiator.Slowly add a 50/50 mixture of GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL and clean, drinkable water to the radiator until the coolant level is at the base of the radiator fill neck.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. Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL coolant. Install the coolant recovery reservoir.The rear right engine block drain is located near the crankshaft position sensor. ![]() The front left engine block drain is located between the starter motor and the engine oil filter.Remove both of the engine block drains.Important: Allow the coolant to drain completely. Place a drain pan under the engine block drains in order to collect the used coolant.Open the air bleed valve above coolant pump 2 full turns.Open the air bleed valve on the thermostat housing 2 full turns.If only partial cooling system draining is required, drain enough coolant to perform the procedure. Open the radiator drain valve located at the bottom of the radiator tank.Place a drain pan under the radiator drain valve in order to collect all of the used coolant.Disposing of ethylene glycol into the sewer system or ground water is both illegal and ecologically unsound. Ethylene glycol antifreeze is very toxic. Important: Recover and store used coolant in a used coolant holding tank and submit the used coolant for recycling on a regular basis. Wait until any residual pressure, indicated by a hissing sound, is relieved.Īfter all hissing stops, press down on the radiator cap and rotate the cap counterclockwise in order to remove the cap. Do not press down while rotating pressure cap. Slowly rotate the cap counterclockwise to the detention tab. Remove the radiator cap when the engine is cool:.Remove and clean the coolant recovery reservoir.Ĭaution: Refer to Radiator Cap Removal Caution in Service Precautions.Drain and refill the engine cooling system every 5 years or 240,000 km, (150,000 mi), whichever occurs first. Important: Do NOT add any engine coolant supplement sealant pellets to the cooling system. You'll be glad you did.I Suspect that you have AIR in your COOLING SYSTEM Fallow Procedures BELOW to Insure there is NO AIR IN COOLING SYSTEM Drain the system, refill with water, use the Prestone heavy duty radiator flush, drain, refill with water, drain, then refill with universal. But you have to make sure you do a COMPLETE cleaning and flush of your system.leave no traces of the DexCool in your system. The best answer, of course, is to completely flush the DexCool antifreeze from your system and refill with the green universal-type of antifreeze. Currently, ChevronTexaco and Prestone are the only two suppliers of Dex-Cool coolant. Dex-Cool is a registered trademark of GM, for coolant that meets GM specification 6277M. ![]() In 1996, GM began switching its vehicle fleet to Dex-Cool, an antifreeze/coolant that uses carboxylate or organic acid technology (OAT) as its main corrosion inhibitor compound, instead of inorganic salts. Most automakers recommend these coolants be changed every three years or 36,000 miles. Because ethylene glycol is naturally corrosive, however, coolant manufacturers have long used inorganic salts such as borate, phosphate, silicate and other chemicals to prevent automotive cooling systems from rusting and corroding. Most automotive antifreeze/cooling systems in this country use ethylene glycol as the main component in their coolant. Mixing universal with Dexcool antifreeze will almost guarantee the mixture will gel and sludge in your cooling system. There is a reason mechanics call Dexcool antifreeze Dexsludge for a reason. My suggestion is.DO NOT MIX ANYTHING WITH THE DEXCOOL UNLESS IT SPECIFICALLY STATES IT IS DEXCOOL.
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