Occasional antifreeze leak?

The anti freeze is leaking out somewhere. I had a 95 villager and it did the same thing. I found several places. One, was a plug in the radiator that was tightened with the use of an allen wrench. I found another place was the hoses. Not too that cold is different than hot. You may not see these leaks when the car warms up. Like gas leaks, I stick my head underneath the cars hook the very first time when the car starts and I find all kinds of leaks if they're there.