It could very well be an inaccurate guage as well. My IR says it 180/190 ish vs gauges that's at the same spot my sensor goes Into the block, it an electric gauge. I am going to flush the system (looks dirty) and I was going to replace thermostat. Just for good measure.
Also the shroud is 20" across, factory 4 blade is 18". I have a 7 blade 18" laying around I am going to swap for the 6 blade 16" fan .