After getting my car back from the shop, the techs there noted that the car is running cool, and asked if I had a 160* thermo in it. No, but I did swap the 195* out when I got the car because of a SES error and dropped in a 180*. However, I thought that unless the PCM is reprogrammed to recognize the 180*, it doesn't matter. So I guess two questions here.
1. Does simply putting a 180* thermo in without changing the PCM make a difference?
2. Can an engine run too cold? I never saw the temperature guage go over 195 today after some 1-2 hours worth of highway driving today, mixed with a little city driving.