I don't think it will get that cold here in missouri, so I don't think mine will throw a code. I reset my ecu.

 

I get a code (stored code, but not a CEL) in the winter with my 180. But I also get it with my 195 tstat. Reason is, I will often go weeks at a time, and never see my engine temps get up above 140-150. It's not because of my t-stat, it's just that cold outside. Basically, my thermostat just never opens, so it doesn't matter if it is a 180 or a 195. Now in the summer, the tstat definetly opens, and the 180 definetly keeps the engine temps down compared to the 195, and I never get a code in the summer.

 

Where in MO do you live?
I noticed my temp gauge last night on the way home (40 deg.) stayed at around 160. I may do the cardboard thing closer to winter just to keep it at correct temp....

 

Sparta, just south and east of Springfield. You? Only cover part of your radiator, not all of it. I might do it if it gets cold enough this year. Last night was cold.