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All sorts of things cropping up lately. The newest one is that I keep finding my coolant overflow reservoir empty after even relatively short trips. Water hoses are fairly new and have held water perfectly fine until recently. There is no water in the oil. There is no water in the cabin (carpet dry). I can't find any drips after stopping. I refilled and burped the system, and it did not fix the problem. Any ideas where the water is going?
Small crack in the reservoir? In this heat, it would evaporate before it hit the pavement. Is radiator level correct?
Get a pressure test from Vato-Zone and pressure test the system. I'd bet it is one of the 'lil bastard coolant hoses... ::Rant::
More on the subject - http://www.dfwmiata.com/threads/2766...ressure+tester
Water pump?
How often are you checking? If your radiator cap is not sealing well, you could be blowing some coolant out at full operating temp, overflowing the reservoir, and then sucking some of the remainder back out of the reservoir as it cools. I'm not sure how that would get you to a *dry* reservoir, but it can get you low on coolant quickly in a few days.
I check whenever I get home and I'm done driving for the day, although I've checked more often lately. Today for whatever reason it seems to be holding the level just fine. I'm gonna do a pressure test soon, and hopefully that'll turn something up.