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.
Directions. 1  In a large skillet or saucepan, melt butter with olive oil over medium-low heat. 2  Add chopped onion, mushrooms and garlic; saute until soft. 3  Add spaghetti sauce and seasonings, stir well. 4  Simmer over low heat for at least 10 minutes, but the longer the better.