fan clutch

Hey all, I have a 2009 Chevy2500 HD. I had my plow on last weekend, drove approx. 2 miles at 30-35 mph. Everything was fine, turned onto the highway, reached 45-50 mph coming up the on ramp, when I looked down at the "engine temp guage" it read 210-normal. However, when I looked at the "outside...