In this video, I show you how to bleed the cooling system on a 2016-2019 Chevrolet Cruze (second-generation model). Getting all the trapped air out of the engine block and heater core is a critical final step after any cooling system repair or flush, preventing dangerous hot spots and keeping your engine running at its safe operating temperature.
Common signs that your cooling system still has trapped air include:
- The dashboard temperature gauge spikes rapidly or rises into the red zone shortly after driving, even though the coolant reservoir is full.
- Your cabin heater blows cold or barely lukewarm air at an idle, but starts getting warm only when you rev the engine.
- You hear a distinct gurgling or rushing water sound coming from behind the dashboard when you accelerate.
Step-by-Step Overview:
- Initial Fill: With the engine completely cold, slowly fill the coolant surge tank up to the “COld Fill” arrow line using a 50/50 mix of Dex-Cool coolant and distilled water.
- Open the Bleeder Vent: Locate the plastic air bleeder screw on the upper passenger side of the radiator tank. Loosen it carefully until you hear air escaping. Once a steady stream of solid coolant flows out without bubbles, snug the screw back down (do not overtighten, as it is plastic).
- Run to Operating Temperature: Leave the surge tank cap off. Turn the cabin heater to maximum heat and the fan to a low speed. Start the engine and let it idle. Watch the reservoir level drop as the thermostat opens and draws fluid into the engine block—top it up as needed.
- Final Cycle: Once the lower radiator hose gets hot (meaning the thermostat is open) and the radiator fans cycle on, rev the engine gently to ~2,000 RPM a few times to push out residual air. Shut the engine off, let it cool completely, recheck the tank level, and tightly secure the cap.
Safety First: Working with automotive cooling systems carries a serious risk of boiling fluid and severe burns. Never remove the surge tank cap or loosen the bleeder screw while the engine is hot or under pressure. Always protect your hands and eyes by wearing durable gloves and safety glasses, work in a well-ventilated area, and stay completely focused and attentive throughout the entire process.
As an experienced mechanic with a deep background in professional automotive repair and diagnostics, I am here to help you get your car serviced right. If you run into any issues getting the heat to work or have questions about a stubborn air pocket on this specific model, just leave a comment below and I will help you out!