yah well i'm new to this club but i would like to know why my rx7 overheats above 3k rpm i changed thermostat and flush the radiator but i didn't get all the air bubbles out.....so anyone got any ideas on what happens.......and it has 186,000 miles with low compression, 1st rotor 100psi and 2nd is 80psi.....thx

 

did you replace the water pump??? maybe it is corroded and not pumping enough water when your at high rpm??

 

Try and get all of the air bubbles out as best you can. Did you replace the thermostat with a OEM Mazda one? They seem to be the only ones that work correctly. Check to see if your clutch fan is working properly. Check the radiator for cold spots after the car is warm, indicating a clogged radiator. I've had that happen. Also, do you have the fan shroud and plastic underbelly tray in place? It wouldn't hurt to replace your radiator cap either.

Oh, and welcome to the rx7club

 

Overheating when moving has nothign to do with the fan clutch. At speed, the fan isn't doing anything. Generally, overheating when moving means either the rad isn't cooling the water properly, or the water isn't getting circulated. Theres a good chance your rad is corroded and has very little flow. The other possibility is fried coolant seals, which becomes more likely the more it overheats.