I have been dealing with this for a few months now. Over the early part of the summer (June or July I think) my Concorde 3.5 LXi was overheating. I thought it was the fans, but it ended up being the thermostat. Changed that and thought all was good. Well a few days letter I was getting a coolant temp sensor check engine code. I just replaced this sensor last weekend and it just popped up again. I disconnected the negative when I was working on it and all that. I'm tired of this check engine light and I need to get my vehicle emission-ed before my birthday at the end of the month. I also noticed that it takes awhile for the temp gauge to read normal temps now. The needle barely moves off of the cold and I am getting heat inside the car just fine. I could drive almost all the way to work and it just gets to "operating temperature." If anyone has any ideas, I'm game. Thanks!