Thanks to both of you. Sorry for the confusion. It's from the outlet tank (the one on the right side if you're facing the car). Making this car a project so don't want to spend much right away. All hoses looked old and can tell that because it was so easy to rip from the radiator with the clamps from hell. I thought it's a good idea to do this and see. But to make it convenient, I had to take the fans out and still battling to take one more clamp from the lower hose. I can almost take the whole radiator out. Is there a way to take out the outlet tank and test it? Any suggestions regarding this topic is really appreciated and many thanks to each of you.....