Alright, here's the deal. I've had my 7 for about a year and a hafl now, and since have gone through an engine replacement and misc. repairs. For a while, I had a fuel management system malfunction, but that was determined to be a coolant leak that had somehow slid down the wires into my engine computer, corroding it and causing strange malfunctions. Now, I had that cleaned, and other parts of the coolant system replaced, but now I'm having severe coolant leaks all throughout the car, and it seems that new ones are popping up all the time. I can't even keep enough coolant in the car to keep the engine from overheating within 5 minutes of starting it. The engine seems to run rough as well, and I just can't seem to figure out what's wrong with it. I had a rotary enthusiast look at the car locally, and he thought I had a defective water pump (pushing air through the coolant system when it shouldn't, causing unneeded pressure which was causing all the leaks,) but a Mazda technician took a look and told me that the water pump was fine, he just couldn't figure out what the hell was wrong with the car. Can anybody out there help me? I really want my car to run nicely again. Sorry for the long post.

 

You may want to pressure test your coolant system to root out your leaks first.
I,m on the other side of the problem and with only a few things to check before I diagnose the coolant seals are leaking.
Hit the search feature and search "coolant leak" you will get a lot of info there,good luck.

 

Is most of the coolant spilling out from the overflow tank (forward of the front passenger side wheel)?

Also, has anyone checked the functionality of the radiator cap on the AST? And make sure that cap is the one with a spring for pressure relief...