Silicone grease on weatherstrips will make them last longer, seal better, and not stick or squeak. Apply silicone grease with a clean cloth. During very cold, damp weather frequent application may be required.
See Recommended Fluids and Lubricants.
Chevrolet Cobalt Service & Repair Manual. Radiator, Replace
1.
Drain cooling system into a suitable
container.
2.
Remove air cleaner outlet resonator.
3.
Reposition radiator inlet hose clamp
at radiator, using hose clamp pliers tool No. J 38185 or equivalent.
...