Engine Cooling problem
2000 Renault Espace V8 Front Wheel Drive Automatic 125809 miles

hi there.my car looses some water and the temperture dose go up in small traffic jams but i can not see any water comming out of it any where.what do you think it could be as i dont want to change the water pump if its not that.after moveing from traffic the temperture dose go back down again.i have checked the oil in the engine and all is ok in there no water mixing with it. many thanks lee