Everytime I get on the highway it starts to overheat, I was thinking it was the thermo-stat, so just out of curiousity I removed the t-stat and took it for a test drive.. It made it worse. It was running hot before I even hit the interstate. I'm wondering if I may have a air lock in the system somewhere, is this possible,if so whats the best way to relive the air, or am I way of base. I previously flushed the cooling system, as-well and also no luck. I am beginning to wonder if its the water pump,its not leaking, but wondering if it is just not keeping up at highway speed's at most 60 mph, Its a stock 2f with a header stock trans and rear, running 33's. I can trail ride all day as well as city drive and never gets passsed the first line on the gauge.. I spray the radiator down with the hose thru the fins and it was real dirty but I have'nt taken it for a spin yet, so maybe it was just not breathing enough thru the radiator. Is an airlock possible? Is it my water-pump? When a water pump stops working does'nt it usually leak, squeal, shaft fall out or all of the above? Any help would be awesome, I've never had a situation like this in the past so I'm asking the guru's... Thank's in advance... Ryan