coolant leaked out
coolant leaked out on 2000 BMW 323i
obvious spots at the radiator. Not so obvious: around the throttle control. There's two hoses there, a supply and return.
You need to have a shop pressure test the cooling system to determine exactly which parts has failed and you can check cooling system diagnoses prices here http://repairpal.com/estimator?car_type_id=2726 and locate a shop near you here http://repairpal.com/directory?address=95476&car_brand_names=BMW Call a local shop and if your BMW is overheating you probably should have it towed to avoid damaging the engine