Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 115 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSFLUSHING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Repair Instructions: Flushing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Flushing
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Do not use a chemical flush.
Store used coolant in the proper manner, such as in a used engine coolant holding tank.
Do not pour used coolant down a drain. Ethylene glycol antifreeze is a very toxic chemical.
Do not dispose of coolant into the sewer system or ground water. This is illegal and ecologically unsound.
Various methods and equipment can be used to flush the cooling system. If special equipment is used, such as a back flusher, follow the manufactures instruction. However, always remove the thermostat before back flushing the system.
Store used coolant in the proper manner, such as in a used engine coolant holding tank.
Do not pour used coolant down a drain. Ethylene glycol antifreeze is a very toxic chemical.
Do not dispose of coolant into the sewer system or ground water. This is illegal and ecologically unsound.
Various methods and equipment can be used to flush the cooling system. If special equipment is used, such as a back flusher, follow the manufactures instruction. However, always remove the thermostat before back flushing the system.
- Apply the park brake.
- Drain the coolant. Refer to Cooling System Draining and Filling (L61) .
- Fill the coolant system with clean drinkable water. Refer to Cooling System Draining and Filling (L61) .
- Start the engine and run at 2,000 RPM until the thermostat opens.
- Turn OFF the engine.
- Drain the coolant system. Refer to Cooling System Draining and Filling (L61) .
- Repeat the above procedure until the water from the coolant system is colorless.
- Drain the coolant system. Refer to Cooling System Draining and Filling (L61) .
- Add 3.8 liters (1.0 gal) of concentrated antifreeze since there will be some water in the system.
- Add a mixture of 50/50 DEX-COOL® antifreeze and clean drinkable water until the level stabilizes at the weld seam on the surge tank. Refer to Cooling System Draining and Filling (L61) .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.