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  1. Coolant issue diagnosis

    DIY - Do It Yourself / Tech Tips
    I'm looking for help in diagnosing a coolant problem. I have read many discussions of similar problems, but now it's happening to me. A couple of weeks ago, I had a few sluggish starts and the temp gauge started fluctuating, so I changed the thermostat in my 2008 Frontier, 4L V6, 2WD, SE...