Thought I would share something with you guys. The coolant has been disapearing on my 96 for about 3 years now. Car never overheated and always ran great with good power but the exhaust was stinky and about 19 MPG on the highway.
Finally found the problem. In the lower intake manifold coolant was leaking into the EGR system and the coolant would spray evenly into the cylinders when the EGR valve opened up. I was able to see where the coolant was spraying into the engine with a black light and yellow safety glasses.
I dont know if this is a common problem but if your losing coolant just remove the upper intake and have a look.