Chemicals used for ice and snow removal and dust control can collect on the underbody. If these are not removed, corrosion and rust can develop on the underbody parts such as fuel lines, frame, floor pan, and exhaust system even though they have corrosion protection.
At least every spring, flush these materials from the underbody with plain water. Clean any areas where mud and debris can collect. Dirt packed in close areas of the frame should be loosened before being flushed.
Your dealer/retailer or an underbody car washing system can do this.
Chevrolet Cobalt Owners Manual. Engine Compartment Overview
When you open the hood on the 2.2L L4 engine, here is what you will see:
A. Engine Air Cleaner/Filter (2.0L Turbo Engine) or Engine Air Cleaner/Filter
(2.2L Engine).
B. Engine Oil Fill Cap. See “When to Add Engine Oil”
under Engine Oil.
C. Engine Oil Dipstick (Out of View). See “Checkin ...