Last weekend I had no heat in my truck and noticed my temp gauge fluctuating up and down but never in the "red" danger zone. When I got home I checked the fluid level in the radiator and had to add quite a bit of anti freeze. I went to camp this past weekend and on the way home noticed the same problem. I am losing anti freeze. When I got home and opened the hood the front of the engine block and hoses/lines were wet with anti freeze but I couldn't tell where it is coming from. I wish it were a simple hose or line somewhere but suspect the water pump since it is right in that area. Is there a way to diagnose the water pump? I plan to fill the radiator again and run it to try and figure out where the fluid is escaping from but wondered if there was another way to diagnose.