* Fuel Tank: The fuel tank itself is part of the system, as it's where fuel vapors originate.
* Canister (Purge Valve): This is a charcoal canister that absorbs fuel vapors. Its location varies slightly by year but is generally found near the fuel tank or along the frame rail under the car.
* Vapor Lines/Hoses: These lines connect the fuel tank, canister, and other components. They run throughout the engine bay and under the car.
* Purge Solenoid: This valve controls the flow of fuel vapors from the canister to the intake manifold for combustion. It's usually located near the engine.
You won't find a single "evaporation system" unit. It's a distributed system involving several parts in different locations. To pinpoint specific locations for *your* Cavalier's year and model, you'll need a repair manual or a diagram specific to that vehicle.