I have a 2004 Ranger 2.3L 4CL 5 speed. As I am driving on the highway it will randomly over heat. This has only happened a few times and what happens is I will be going along usually around 70 mph and it will jump from the normal right below half way range to the red line, instantly. Its not gradual at all, just boing! and its red line and the dash light comes on. after anywhere from 10 to 20 seconds it drops right back to normal, again not gradually. Just right back. And then it wont happen again for a week or two. But ive been experiencing this for several months. Any Ideas???
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