Car running hotter then usual

you need a thermostat or else the antifreeze just gets hotter and hotter and hotter,and blows your headgasket again

You don't mention the engine thermostat. That would be my first move. providing the engine is running well and does not appear to have a timing problem.
You can remove the thermostat for a trial period. If you drop it in hot water the thermostat should fully open. A thermostat that fails to fully open will restrict coolant flow and create overheating problems.

The slow rising temp gauge points to a thermostat which has failed and stuck open. This is easy to replace.

At the same time the gauge will tell you if the car is overheating.

Is it losing coolant at all? A hot smell can result from leaking coolant getting on the exhaust manifold.

The smell can also result when leaking engine oil gets onto the exhaust. Camrys of that era had several characteristic oil leaks

- from the rear of the cam cover, especially on a V6
-from the distributor shaft o-ring
-from the oil filter-to-engine block mounting adapter (if fitted)

1.check coolant level---must open bleed valve above thermostat when adding coolant. 2. Are fans radiator fans running when car ovrheats & is air comming off of radiator hot? 3. Check/Replace thermostat. 4. There is a plastic elbow that connects from the intakke manifold to the engine block on the passenger side of car that arrre notorioous for cracking / leaking.... 5. The heater core on `05 Impala does not close when heater is turned off so does not benifit overheating by turning heater on.

check if the thermostat is not faulty

If the car is still running hot after replacing the thermostat, then there are a few issues that you need to check. Is all the air bled out of the cooling system? Do you have a leak somewhere? Is the top hose and bottom hose both getting hot? Is the temp sensor working correctly (meaning the sensor says that your car is in the red, but really your car is not overheating at all). Is the cooling fan turning on? It has to be one of those that is causing the issue with the car overheating. Most of the time, its due to not bleeding the air out of the system, or the water pump not functioning correctly.

yes, it could be thermostat. That would be an inexpensive DIY repair that might solve the problem.

Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Only way to really know is to test thing but the things that can do this are the fuel pump or relay. The crank sensor, the ignion module, the coil.

This is providing the coolant is not overheating. If the coolant is overheating then as the motor gets hotter,,less fuel will be added creating a possible stall. When an engine is shut off they usually get a little hotter by the sensors before they start to cool down.

go ahead and have the thermostat and the thermostate switch replace since its giving you a sign, you don't want to have it overheat and leave you stranded or ruin the motor. the fans seem to work fine since you can hear and see it running.

first check your axillary fan for function,if change your thermostat element look at the bottom you can see what degrees open the element,you can buy element with lower degrees.axillary fan working,first stage when aircon is on.