'94 civic intermittent overheating problem. replaced: timing belt, water pump, t-stat, radiator, bled coolant, checked rad fan-ok, no coolant in oil, no oil in coolant, no white smoke in exhaust. the only thing i noticed, when i started the car cold, the rad overflow tube is emitting a slight mist, when submerge in the overflow reservoir, it gives the impression of boiling coolant???any ideas, anyone? - thanks

 

as cheap as it is (compared to some you did )
i would replace the radiator cap.

are you losing any coolant?