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thank you, i let it get to 183 turned on the air, full blast hot with a/c, didnt work right away, so i switched to cold, and it started working, so i switched back to hot, and it still worked. so i guess it just took the pcm a minute to think. short of getting it in the 200s to check normal...

so the a/c must be on with the air, but does the air temperature matter hot/cold.

hello, im new to the site. i mostly work on my 96 trans am so my wife's 2008 cobalt LT is soooo wierd to me, its having an overheating issue. one day it jumped up to 210 to 220 at idle. before this it was always in the 180s unless going up large hills. i checked the thermostat and it was good...