Find your water pump and see if water is leaking out of the weep hole if so it is a sign that it is time to change the water pump. If you have not changed your timing belt and your mileage is 80,000 to 100,000 miles or is due for another change then i would do this as well since you will already be taking it down to the water pump you might as well change the timing belt so you don't have to tear it down again. Hope this helps. could also be a radiator leak.