PendO

First post (actually second as I put the first in perhaps the wrong section?), I have a 2007 Suburban w/ the 6.0 ... its my wife's daily driver so I see it when it needs gas and has a problem ... when it is started in the morning it will climb in temperature to 235 and sit pretty constant, if you drive it to the grocery store and sit in it it will idle at 235-245 ... if you run down the hyw at 60mph it will cool to 210 ... if you drive around town in stop and go traffic it will range from 225-240 ... I'm taking it in tomorrow to see about having the thermostat replaced (does that sound like the place to start)?

Thanks,
Casey

[IMG]local://upfiles/13309/3A21FF0E6805474E9F06A7C4C10A35F0.jpg[/IMG]

[IMG]local://upfiles/13309/42E1E9FF7A224383B5267FB7DE503F61.jpg[/IMG]

[IMG]local://upfiles/13309/E8789C41C89B4E4CB1EF346BBE252DBC.jpg[/IMG]
[/quote]

Scoper50

Although over heating problems can result from a variety of problems, ranging from a faulty thermostat, to a clogged heater core, radiator, etc... The first thing you should do is feel your upper and lower radiator hoses when the engine is warmed up. The top hose is where the coolant enters the radiator, and it should be pretty hot. The bottom hose will be warm, but should be significantly cooler than the top hose. If it is cold, your radiator could be obstructed. But in my experience, I've seen a lot more fualty thermostats then clogged radiators and heater cores. Chances are, your thermostat isn't opening all the way. If your top radiator hose isn't burning hot when the vehicle is running at 210+ degrees, you probably have a thermostat problem.

Scoper50

One more thing I'd like to add. You said the engine runs up to 245 degrees. Not only is running at this temperature not good on your engine, but you are dangerously close to boiling your coolant and ending up stranded on the side of the road. Water boils at 212 degrees (If I remember right). Coolant boils at 212 degrees also when it is not under pressure. Most automotive cooling systems are pressurized at around 16psi. For every pound per square inch the boiling point of the coolant raises 3 degrees. So assuming your cooling system holds a constant 16psi, your coolant won't boil until it hits 260 degrees. You need to get this checked out sooner rather than later.