My 2004 3.4 liter impala had this problem.I found out the Rad. overflow tank was leaking Rad fluid out of the overflow nozel on the tank.I pluged the overflow nozel and added a hole in the tank cap.filled the tank to the proper level and bleed the air out of the Rad.(plug on rigid tube of engine, pull plug til fluid comes to top while running)never had another problem over heating again.
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there is a tube or hose running from the radiator to a plastic bottle, the bottle has two lines on it, maximum and minimum levels, when the coolant level is lower than the minimum line you can fill it to the max line. one note of caution: if the car is hot or cold this can change the level so check it when you first go out in the morning to start it.
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.
you do not fill it to the top. if you lok at the side of the bottle, there is LOW mark HIGH mark. your level should be between those 2 marks. if you filled it all the way to the top, some will leak out when the car gets hot and then the level will go down when car cools off.
Check in the main radiator with the motor cool that the coolant is full as if the coolant is low there will be no heat in the heater. If it is low you need to check for leaks or head gasket problems. If its full check that the temp guage is coming up to its normal position as the thermostat could be faulty. Then make sure that the heater tap is operating corectly.
YOU NEED BLEED COOLANT SYSTEM.CHECK COOLANT LEVEL IN RADIATOR.ADD MORE DEXCOOL UNTIL COOLANT LEVEL IS CLOSE TO RADIATOR SPOUT.CRANK ENGINE LET IDLE UNTIL TOP RADIATOR HOSE GET HOT.WATCH TEMPERATURE GAUGE.IF TEMPERATURE GAUGE START RISING TO HOT ZONE.TURN OFF ENGINE.LET COOL DOWN.USE LARGE RAG SLOWLY OPEN RADIATOR CAP A LITTLE AT A TIME UNTIL ALL PRESSURE RELIEVED.REMOVE RADIATOR CAP.ADD MORE COOLANT.CRANK CAR AGAIN LET IDLE UNTIL TOP RADIATOR GET HOT.KEEP EYE ON TEMP.GAUGE ALSO.WHEN TEMP.GAUGE STOP CLIMBING.YOUR COOLANT SYSTEM BLED.WHEN DONE LET CAR SET A WHILE CHECK COOLANT LEVEL.ALSO FIRST THING IN THE MORNING CHECK COOLANT LEVEL AGAIN.AND BESURE ADD COOLANT IN THE OVERFLOW JUG TO THE COLD MARK.DONT OVER FILL THE COOLANT RESERVOIR JUG.WORK SAFELY DONT GET SCALDED.
Check the sensor which controls the cooling fans that cools the radiator it prevents the engine from over heating and allows the temp gauge to stay at normal range.recently had problems with my 2003 impala overheating it was the sensor had the thermostat replace as well.
No heat is often a symptom of low coolant, usually followed by overheat. There are other controls that regulate heater, but right now, re-fill the cooling system with engine running and heater on high, then check for leaks (coolant you lost went somewhere...you need to determine where) Low coolant will damage your engine. Take care of that first, then if heater still does not work, then do diagnosis on that. (if you loose the engine heat won't matter, will it!)
The first thing to check is the coolant level, if the coolant is full and the heater core hose is extremely hot to touch, then you may have a door problem. If you like we can work together on this problem. First check the coolant level. Then run the engine until operating temperature, grab each of the heater core hoses and let me know what you find.