For service and parts needs, visit your dealer/retailer.
You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:
Chevrolet Cobalt Service & Repair Manual. Cylinder Head R&R
Removal
1.
Remove air inlet duct and resonator.
2.
Disconnect IAC, TPS and MAP sensor.
3.
Disconnect EVAP and PCV hose.
4.
Disconnect purge solenoid tube and
brake booster hose.
...