removing thermostats

I would like opinion on removing thermostats. I have a ser 60 Det. I have a manual fan switch, but was thinking of removing the the stat's during the summer months. at 90 plus temps, pulling heavy, up hill's, I just don't like the water temp gauge climbing like it does. air to air is good, new rad, a while back. back in the day, we used to take the stat's out of all our car's in the summer, ran a lot cooler. not sure about diesel engines. I know a diesel is supposed to run at a certain temp, but what I want to know is would this hurt the engine? some one told me if I take them out, the coolant, may flow backwards & overheat? is that possible? just an idea.

 

my fan just does not drop the temp enough to satisfy me. when going up a good grade, the temp still rises with fan on. I usually turn on at 195 but it will keep going up to 210 215. luckily I do not run any long hills, just the hoover, AL area, & I have to keep fan on for 20 miles or so, just a slight grade in summer & the temp rises quick. I had everything done to the cooling sys & even a new rad, when I did'nt think I needed it, cause it did not bring temp down.

I understand the theory of the coolant has to stay in the rad for a period of time for it to cool, but. lets say water temp is 200 degrees... no matter if a have 190's or 160's thermosat's or no thermostats, at that temp, wide open would be wide open, would it not. I dont think the stats close at all in the summer while driving in 90 plus heat, especially pulling a load. so what would be the difference in running with stats open & no stats? how would the engine know if the coolant is running thru open stats or no stats? years ago 10 to be exact. I thought I would let my engine fan run without me turning on manual fan. temp would rise, fan would kick on at 220 or so, then kick off at 190 or so. seemed to work real well, then a month later head gasket leak. so since then , I am afraid to let temp get past 190. never had a problem running cooler. had tried 160 stats a while back & never had a problem. at all. was thinking about going back to them. I would of kept them in, but since inframe 125,000 miles ago. shop put the new ones with the kit in. so thinking 160's back in or leave them out.

also new w.p at time of inframe. at this point, I am afraid if it gets real hot one day pulling a hill, my fan may not be able to keep temp low enough & engine may shut down. I will take the advice of the coil cleaner & outside of rad. thank you for the opinions. still considering options.