2004 CHRYSLER SEBRING OVERHEATING: we have replaced radiator, thermostat and housing..has been flushed. Doesn't overheat while running stationary just when driven..help!

SOURCE: My Jeep overheats while sitting idle. When I drive, the gauge goes down quickly. I have had thermostat and fan changed. I have also had the radiator flushed. What can it be?

we have a 2003 and it did the very same thing . Its called cooling fan relay it costs about 60.00 and is located behind the headlight assembly . not very hard to fix if you know anything about cars .

SOURCE: 2004 Jeep wrangler 4.0 - 6cyl overheating

I had the same overheating problem in my jeep ! My problem was finaly found out to be the clutch in my fan its a different kind of clutch system it work as this. When your jeep gets warmer the tighter your fan clutch gets .While cool your fan moves slowly. now to test your clutch just warm up your jeep and rev it up a bit if your fan dose not pick up speed then it is sliping.What will come out of this is that you fan will the seez and run full all the time. if you jeep dose not overheat wile moving then it is not your thermo stat period.

SOURCE: Overheating Fiero

well fieros are very different cars you need to fill collent in a speical way so air doesnt get in the lines most fiero owners do not know this but it very important The best way to tell it is for wikipedia
Cooling system issues
With an already hot normal operating temperature of 220 °F (104 °C) prior to the recall switching to a 195 °F (91 °C) thermostat, the mid-mounted engine utilized long pipes to carry coolant to the front-mounted radiator. This demanded that a special coolant filling procedure be followed to prevent severe overheating. Simply pouring coolant into the thermostat housing (on the engine) would leave an air bubble in the radiator, while adding coolant just to the radiator would leave an air bubble in the engine's coolant passages. Proper procedure (with engine idling and the thermostat removed, filling the thermostat housing, burping the bubble out of the radiator by cracking open the radiator cap until coolant exits) must be followed in order to ensure an air-free cooling system.
A second problem has become common as more Fieros are being serviced by shops unfamiliar with their design. The under-body coolant tubes are positioned in such a way that a casual glance beneath the car will not suggest their fragility. As a result, many have been crushed by shop lifts, resulting in a near complete lack of engine cooling. The age of the car means that even GM dealerships may now be unaware of the proper jacking methods.
Lastly, the absence of a spare tire (at the front of the car, right behind the radiator) could have an effect on coolant system performance. i dont know who wrote this and i dont take credit for it