This is really a stupid question and you should sell your rx7 to someone else who is more informed and able to handle such a car. If your car needs a new coolant seal, it means you have to get the engine torn down (around $1k in labour) and have new internals put in (around $2k for basics, not core).
Blown h20 seal in engine or turbo !!
faulty pressure cap or center housing has rusted through to the outer seal ...
mazda doesnt rx7 anymore :(
Bad Apex seal
Yes. You must take the engine apart.
Replace the convertible door seal.
Rotaries don't have cylinders, heads, or head gaskets! It sounds like you have blown a water seal, which is the equivalent to a blown head gasket usually attributed to overheating. Unfotunately, a blown h20 seal requires a rebuild to fix!
Bad head gasket? Bad thermostat? Defective radiator cap?
tool
A second gen Rx7 would be much faster.
In just about any car including the Mazda Rx-7, ethylene glycol based coolant is recommended. This is the most common coolant found at your local automotive store. A 50/50 mixture with distilled water is best.
Coolant temp sensor, or leaky injectors, bad Ecu, weak battery