Last night I don't think I saw the temp gauge hit over 160 and I had been driving/running the truck from noon until 11pm for most of that time. I stopped for less than 5 minutes and shut it off, and when I went to restart it the air from the heater was already ice cold. It was cold out this morning, and appearantly my block heater does nothing (doesn't work). So I tried and tried and tried again to start it. Finally grabbed an electric heater out of a camper on plugged it in underneath the motor and stuck a drop light on the intake. After almost frying the starter, I finally and someone use my crew cab and tow the Diesel. For about 150-200 feet the motor turned over and was forced to run unwillingly until it finally ran on it's own. I think I need to go buy glow plugs.