how much anti freeze goes back in
Top off radiator to the very top, full. When cold the overflow tank should be about 1/4 full. I always add when I see Cobalt, be sure you have had your car in for the re-calls. (2005 to 2010) and maybe more. Ignition switch, and people are dying because if it.
Search Chevrolet Cobalt Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Cobalt Experts