OK i bought a 86 Rx7 GxL non turbo and it starts to overheat i changed the thermostat and still overheats..... it only over heats on the street but on the freewat itz perfectly fine..... Wat can i do 2 prevent ot from over heating?.... and also if i dont start it for awhile Gray smoke comes out of the exaust and it has like a sweetz smell

 

sounds like a blown coolant seal. search, its been covered.

 

yep especially if you smell it in the exhaust....i heard that sometimes coolant can get through ur intake manifold i dont see how that can happen but check around for coolant leaks and take your time

 

if it only overheats when you're going slow speeds then the clutch fan is worn and needs to be replaced.how fast are you loosing coolant?

 

Did you replace the thermostat with the OEM one? If you didn't, you should.

 

i wanna say its ur fan too. you could look into converting to an electric fan as i did.

 

I'm with the few that think it's the fan CLUTCH. Clue #1 was the fact that it only happens at low speeds, when the fan should be on.

either get another or go E-fan.

Have you checked to see if your coolant seals are ok?

 

How do you check the seals?

 

bubbles in the radiator is a sign

white, sweet-smelling, smoke on start-up is a sign

turning the rotor by hand with the spark plug hole open and checking for coolant (seeps in the the chamber when the coolant seal cools and contracts)

those are the ones that come to mind that don't involve pulling everything out and opening up the motor.