my 2014 cruze engine came on about 2 days ago now when car shutoff engine fan keeps going for about 10 minutes after car has been shutoff. it also seems to chug when a stop light like its gonna stall

 

This is a common problem....i surmise that if you had the codes checked, you would get P0597/P0598--has everything to do with chevy switching to a thermal housing instead of a simple thermostat. If you look online for that code you will see a lot of chevy's are having problems with this. I'm currently having this problem and "patiently" waiting for some Chevy Rep to actually contact me. I have to pass a emissions test for my Chevy this month, but I can't pass while experiencing these codes.