How can I check my2005 ford explorer for overheating?

A few basic's first , does the temp gauge go into the red , if not where does it level off at ? if the temp gauge does'nt move would suggest the temp sender unit is at fault , have the OBD codes read this should tell you what if any sensors/switch's are faulty, does the engine use a lot of coolant , are you always having to top it up ? if so would indicate the water pump is not working , to test run engine at stationary and hold at 2000 rpm after 10-15 minutes yuo would expect the engine to be at operating temp if the water pump isn't working the radiator top hose will be very hot and the bottom hose will be cool,if the top hose is cool as well then the thermostat may not be opening , after all this let me know how thinga are