Coil Springs
WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
The coil springs support the weight of the vehicle in the rear. Two spring rates exist on this vehicle, base and up-level, depending on the suspension option code. Rubber insulators isolate the coil spring at the upper and lower spring seat.