Here's what the gauge looks like my 2001 2500hd, and you can see what it indicates as being too hot, this being said, the hottest I've ever seen it is about 180 in the summer, unloaded.
Directions. 1  In a Dutch oven, cook ground beef and onion until meat is no longer pink and onion is tender; drain. 2  Add the next eight ingredients; bring to a boil. 3  Reduce heat; cover and simmer for 1 hour, stirring occasionally. 4  Remove the bay leaf. 5  Serve with spaghetti. 6  Garnish with oregano if desired.
Pasta Sauce Instructions: 1  Heat the olive oil in a medium size pot over medium heat. Add onions and saute until soft, about 5 minutes. 2  Add garlic and saute another minute. 3  Then, add tomatoes, tomato paste, oregano, basil, bay leaves, thyme and salt/pepper.  Bring to a boil and immediately reduce to a simmer.