Very well said Wayne, a lot of good information. The only thing I could add is if you change the coolant yourself and the cooling system uses a temperature activated switch in the cooling system to turn on the cooling fan is make sure you bleed the cooling system of air or an air bubble could prevent the cooling system sensor switch from turning on the cooling fan for the radiator. Some systems have a bleed valve in the system near the top of the cooling system to bleed air. Of course always follow the manufacturers instructions for correct procedures for changing coolant.
Making sure the clutch fan is working is also important. You should hear the fan moving lots of air when it is hot. It's very obvious in my Dodge when the clutch fan engages when it gets hot.
In my experiences the cooling system bypass hose is the first to leak. After ten years I changed all my hoses. The bypass hose looked the worst. Robert
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