RADIATOR LEAK

They sell a tool to check a radiator for leaks. This tool screws onto where the Radiator Cap comes off. With the tool air is pumped into the radiator building up pressure to what ever pound radiator cap is on the car. If a 15 lb radiator cap, pressure is pumped up to 15lbs. At this point you should be able to see where the leak is coming from. Chances are you have a bad waterpump if the leak is coming from underneath it. There is a weep hole there and when water pumps start to go bad they usually start leaking there. You could also have a leak coming from the radiator. This tool I spoke about would also show that. Leaks can also be coming from the engine block such as at a freeze plug or even a loose or bad hose. If it is a little leak at the radiator you could go out and get some radiator stop leak for a temporary repair depending on how large the leak is until you can find the time to replace your radiator or have it replaced. If it is the water pump the stop leak product will not work for you. Hope I answered all your questions here. Antifreeze coming out of the area where the cap is installed with the cap off while the car is running and hot is a natural thing. The pressure has to push it out somewhere. You need to keep the cap on the radiator. With the cap tight nothing should be coming out of the radiator cap. If it is you may have a bad cap. If it is coming out of the overflow hose you could have a bad thermostat making the car overheat. Without seeing the car myself it is hard to pinpoint your problem here. Can only give you some ideas and things to look for.

Fred