MY RX7 is running hot. I removed the thermostat and it is still running hot. I don't have a clue?

 

at idle? while driving?
start by checking the cap. flush the system. replace the thermostat.

 

your first mistake was removing the thermostat. under no circumstance should you remove that. is the engine running hot when on the highway, when sitting, when? how old and in what condition is the radiator? whats the coolant level/condition look like? whats the condition of the seal on your radiator cap?

 

I pull the thermostat because I thought it was stuck. I will repalce it. The radiator looks like the original radiator. It ran hot when idling. I fill the system with anti-freeze after pulling the thermostat.

 

you can pick a new radiator up from radiators.com for around a $100 bucks or you can find a shop in town to core it out.

like diabolical1 said raplce the cap, t-stat,flush and i would do the radiator also bc of how old it looks. these are preventive maintance and will save you lots of money in the end

 

If it runs hot when idling, check your fan clutch, it may be going out. Just one of many things.

 

Is the gauge showing hot on a cold start, if so, the gauge wire is grounding. If the engine is quickly getting hot idling, check the radiator, both internally and externally, the water pump and the belts. Replace the thermostat with a mazda oem one only.

Look inside the radiator to see if the tubes are plugged. After warming up the engine, shut it off and feel the back of the radiator for cold spots, that will indicate a plugged core. Since you theink it's the original rad, I suggest doing a full rehab on the cooling system. New rad, water pump, thermostat and all of the hoses, including the heater hoses, along with a good internal cleaning and flush.

Overheating is probably the #1 rotary engine killer.