[Andrew7dg]

I don't believe it is ever too cold out for the car to be running cold. It should be warmed up. The exiting cooling line ideally should be underneath the exhaust manifold like on the 4g63.

There are a wide variety of thermostat out there.

When I went to the parts store, they turned the screen and showed me a list of all the different temps that the thermostat can open up at

Stock it should open at 180 degrees

You can buy one for 160 but I wouldn't because the stock ECU doesn't considered that warmed up and will use a warmup enrichment (this is mostly why you would get bad fuel economy. Cars do get better fuel milage when toasty but the warmup enrichment would mostly cause bad gas milage then a cold engine.) I don't know if dsm link has a feature that would let you lower the the warmup enrichment but I know MS system and most standalones do.

You can also buy one for 195 probably if your car needs to run warmer in the winter

So pick one inbetween.

My stock one went bad and the car blew in cold air all of the time. Also took a long time for it to warm up. Replaced it and got warm right away.

+1 for parts store. Dealer is way to expensive for small parts like this.