Overheating with Snowplow

I have a 2003 GMC 2500HD pickup with a 6.0 liter engine. I had a Western 8 Foot Ultramount snowplow installed. When driving from place to place truck will intermittingly overheat. Anyone ever experience this yet? Thank you.

yes, the plow is keeping the air from the radiator, turn it sideways should help. when on the highway, i could play with the plow location and watch the gauge move, play with it till you find a position that blocks or moves the least air. i think i ended up with straight across, but very low, so she hit once and awhile.