Plow advice oveheating

I just put a 9ft fisher minute mount setup on my truck . Plowed a couple lots everything was fine. Was driving home and the temp was a little higher than usual maybe 210 or so. As I kept driving it got higher and higher. I was going maybe 45 50 mph with blade all the way up which is approx 12" off ground. I then pulled over temp was approx 230 engine kicked in high idle and temp kept going up so I shut it off and waited it cooled down quite fast . So u guys that have plows are u having this problem and what was ur solution. I've read the highway speeds do it and blade height ads to it but the big plows don't raise as high as standard ones. Truck is 09 ram 3500 srw. Thanks, chuck

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