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I have a 2000 Chrysler 300M. After a few weeks of having it (bought in 2010 the inside temperature display would fluctuate from 26 to 123 degrees, also the engine light would come on and the battery light would come on. Spent nearly $400 on testing and replacing items to no avail including ambient switch and the like. A mechanic online here told me to get new battery and all would fix. IT DID! Recently January 2013 it all started doing it again. Engine light comes on, then battery light. And again the inside temperature display fluctuates. Replaced the ambient switch once again and just yesterday bought brand new top of the line battery ($150). Temperature fixed and seemd all lights would stay off. As I was idling at stoplight I heard the blower kick on and then the engine light and battery light again came on. What is the deal with this car? How is the easiest way to correct this problem? Please? xxx