What do you think.

I have a 1999 Blazer with a Vortec V6. For quite some time Ive noticed that the coolant level drops over time. Its not bad but I Need to refill it perhaps once or twice a year. There is no coolant in the oil and I cant find any external leaks either. (There could be but I cant see it under all the hoses and stuff)

Some time back I had a Silverado with the manifold leak and learned the hard way. So Im a bit more "jittery" when it comes to this. However the Silverado had lots of White gunk in the vacuum hoses and the dipstick was no fun at all. On my Blazer however its as clean as it can be. The coolant just seems to vanish in thin air over time.