I've had this V6 G8 for a few months. I've been eyeing these cars since the first year they came out and could finally afford one. About a few weeks ago the car overheated briefly. Was able to shut off the car immediately and coast to a parking lot to avoid any damage. I have coolant and haven't lost any, radiator fans work as they should, no blockage on my radiator for air flow, no noise from water pump and no leaking. I was thinking thermostat might have stuck or the radiator cap wasn't functioning as it should. I started cheap and replaced the radiator cap first to see if that fixed the issue. So far no overheat. But my temp gauge does move to the line I marked on the picture occasionally (I know I need to clean) for a few seconds then goes back down to operating temp. Radiator fans do kick up on high before this happens (the gauge doesn't move every time the fans are blowing on high) and it's only in stop and go traffic after driving a while. The miles are rounding 150K so I want to replace my themostat, water pump and possibly radiator anyway for preventative maintenance (I had a sunfire a while back that gave me cooling issues constantly so I get nervous). I do catch a faint whiff of coolant occasionally. The smell is burnt into my memory from past cars. But I can't find a leak anywhere. Only thing I can think of is I'm getting the smell from coolant going into the overflow and some of the smell comes from the weep hole in the reservoir. I'm rambling a bit but I guess my question is, is this a normal for the temp gauge to move that far? I understand there may be some floating, but I didn't know if the gauge moving up a full quarter was normal.
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