1978 Toyota Landcruiser Cooling problem

Engine Cooling problem
1978 Toyota Landcruiser 6 cyl Four Wheel Drive Manual

Hi. I own a 78 Toyota FJ40 Landcruiser. After running my engine for less than 5 minutes, the temp gage indicates that it is overheating, but the engine and rad are both cold to touch. I drove for 10 minutes and found antifreeze sprayed all over the place under the hood. I flushed the rad and hoses, checked my cap and hoses for leaks. After I flushed it, when I tried to replace the exact amount of fluid, it would only take half the fluid. So I ran my engine again for 5 minutes and I still can't add any more fluid. I'm afraid the fluid isn't getting to the engine. Why would this be happening?