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Engine Temp Drops to COLD when driving!?

45K views 11 replies 11 participants last post by  jerry8  
I disagree. I have a 1997, 3.0 L. It would warm up nicely, and drive along with heat, but when going down grade (coasting) temp would drop to cold. Put in new thermostat, been perfect ever since. Funny things aren't they? Thermostats I mean!