Problem: overheating at low speeds. Fine at highway speed. Coolant was out in the driverside resivor. Heard there was another fill area but didn't see it. Added Coolant to said resivor but didn't go down while running. Checked hoses while at abouve temp. Lower radiator hose was cold. Upper HOT. Guessing that it is either Water pump, Radiator, or Thermostadt. There is no radiator cap that I can see. Cant see flow or feel through hoses. No leaks on ground but coolant sprayed at front of engine bay(while driving). If anyone has ideas please respond. thanks.