Messing With Factory Settings is Fine for Old Cars....but Even then, the Factory could have Saved Tons of Money if You Didnt Need Thermostats..!

Hiding a Problem Doesnt Fix It. New Subarus and Northstar Caddys have Gasket Issues... Messing with Factory Settings Confuses the Computer and Car will 

Think it is Cold...and Richen the Mixtures (Like Leaving a Choke On )...it will run crappy and load up converter...and decrease gas milage...and put out false readings if you need to 

Smog the car.... I experimented with this stuff....it doesnt Solve problems....but.....Good Luck....Your Results May Vary....!

back in the very early days, they did not have thermostats, lol

thermostats came about as a way to warm the engine block a bit faster, which could then produce heat for the passenger compartment a bit faster. was not completely necessary at this point, but it was nice to have.

Modern cars - no way i would run without a t-stat because so much else depends on the system being at a specific temp range -  as mentioned above.
using the correct t-stat for your vehicle is also important. using the wrong one can also produce issues.