I did a fluid flush a week or so, maybe 2 weeks ago because I noticed the color around the cap and neck were mud like and it was running a little hotter than normal. I completely drained it out. Fluished with water then drained that and then vaccumed it out with a wet vac. I refilled but I forgot to bleed it out at the thermo housing. A few days back I noticed it running even hotter than before so I asked around and realized I skipped the bleeding process. I have since bled it but just yesterday i got stuck in traffic and I looked down and noticed my temp was borderline over heating. It actually went into the red for a few seconds but then never got back to that point. I also noticed my center console was very warm. I checked my trans temp and that checked out good. So its only the engine. Water pump maybe? but that cause overheating instantly at highway driving wouldn't it? The problem mainly occurs when I have no airflow into the front of the car ie stopped(lights, traffic etc.) Driving makes the temp drop down substantially.