5.5 - System Bleeding

Modern vehicles are now designed with less room available under the hood. The more aerodynamic front ends have a direct impact on the position of the radiator. The radiator is now commonly found lower then the engine and that causes the air to be trapped in the upper portion of the engine.

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To remove the trapped air from the engine, a bleeder is installed on most cooling systems. As the system is being filled, the bleeder may be opened to free the air. Once all the air is expelled, only liquid will come out. Close the bleeder and the system will work properly.

If air is still locked in the cooling system, it can be identified by a constant variation of the engine temperature or a lack of heat in the vehicle.