How do you change a rear coil spring on a vectra c?

To change a rear coil spring on a Vectra C, first ensure the vehicle is securely lifted and supported on jack stands. Remove the rear wheel and then detach the shock absorber and any necessary suspension components to access the spring. Use a spring compressor to safely compress the coil spring before removing it from the spring seat. Install the new spring by reversing the process, ensuring everything is securely reattached before lowering the vehicle.