Originally Posted by Dak

Overheating a rotary is not something to be taken lightly( or any car for that matter). It doesn't take many times before the coolant seals could be toast.

As others have said get a new/known working radiator cap. I have seen bad ones that would let the system push coolant out to the overflow but would never draw it back into the radiator as it cooled as it should. After multiple times of this you don't have enough coolant in the system anymore and overheating occurs.

To clokker and re-rx7 do you both have the same radiator? I think this could make a difference if re-rx7 has a stocker lets say and clokker has a Godspeed. The added cooling capacity of the Godspeed may make having less airflow through it a non issue in the driving he does. This is pure speculation. I could take my belly pan off since I have the Godspeed one and temps are hovering in the low to mid 90's in TN but I am to lazy or have too much other stuff to do to bother.