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How are you sure it is overheating? Temp gauge? Most likely are stuck thermostat, bad fan thermostat switch, bad fan. bad head gasket. Coolant going into overflow when hot is how that system is suppose to work. As it cools, fluid is drawn back into radiator. It it is not really overheating, bad radiator cap can allow coolant into reservoir more than normal.
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.
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.
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.
If one pipe from the radiator is hotter than the other one its usually the thermostat or water pump, seen as you already changed the thermostat id say its the waterpump.if you start the car when temp. is syill low enough to take the radiator cap off and leave it idleing and you see bubbles from the water at the cap then you possibly have a blowen head gasket etc
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.