Car running too cold

Two questions:
1. How do you know it is running at 160? If you are looking at a temp gauge, it could be faulty. Buy a laser thermometer. They are quite reasonable. I use mine ALL the time. Use it to measure the temp at your thermostat housing, radiator and radiator hoses.
2. I don't know where SGV is, but if you are in the middle of a deep freeze cold snap, that could contribute to your problem. I had a Dodge Caravan that was fine except when it was bitter cold. Then I had to use a piece of cardboard to block off about half of the radiator.