I am really upset with my 07 Aveo. The problem started with summers. With raising temperature outside the temp inside my aveo also increased. Suddenly it started heating up and coolant is drying up within week. With that the mileage has also dropped to 40%. I got it repaired and checked for any leakage, fan relay, radiator pipes blocking and got it serviced with new coolant. But since then mileage has gone down to 40% and coolant has dried up within a week. Dealer is not able to catch up the problem. Also once it got heat up I randomly switched off my Ac and suddenly the temp dropped down to normal. Kindly help what it could be. Is it a problem with AC compressor or with radiator. Please help me.