Hey everyone, so my 13 Jetta doesn't have a temp gauge. So I decided to watch it with obd11. The engine only gets to 80° Celsius if I let it sit and idle it'll get to 205 or so at least that's what it was at when I shut it off. I know diesels in general take awhile to warm up and have a harder time doing so. So my drive to work is about 18 miles. 10 miles of two lane back roads and the rest is a interstate run. Car hovers between 76-81. No codes or pending codes and it was 35° F yesterday day morning and 62 °F in the peak of the day. Is this just a normal diesel behavior to run a little cool or is the thermostat getting weak? At what point do you change the thermostat? It's an absolute bear to do from the sounds of it so I want to make sure it's worth my time.