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Crankcase Ventilation System Description: Operation

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

With the pressure regulating valve (5) inside the cover cylinder head the system is designed in a way to limit vacuum in the crankcase. On top of the pressure regulating valve is an opening to the ambient, which allows the ambient pressure to act on top of the pressure regulating valve membrane.

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