Lately I've been wondering if maybe the thermostat on my truck is going bad. As an example this morning it was 2� and the truck never got above 180� on a 45mile run to work. That is with the radiator blanket on it. On a 45� day it runs about 208� without the blanket.
The truck is an '03 Chevy Duramax.
What do you think? Is the thermostat operating properly?
