It's not in the red, but close. I've already replaced the water pump, thermostat, it's got no leaks and it's full of coolant. What am I missing? Thanks.
When it's cold, check both of the main radiator hoses. They get soft with age, and will slow-down the flow. If one is bad, replace both of them. If they're good, then might need to get the radiator cleaned-out.