'77 300D is getting to the red mark 250 mark on the thermometer just from idling for a while, coolant levels seems good, could it be a problem with the water pump? Any ideas to help figure out what it is? Also, unrelated, but the emergency brake light on the dashboard isn't turning off when the parking brake is off, brake fluid levels are full. I'm new at this so I might be just missing some easy thing, thanks for the help!