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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seems that you have a coolant leak somewhere and when cooling down the leak is sealing and drawing back reservoir water
could simply be a radiator cap problem
have a coolant pressure test done
check under the water pump body for a leak under running and pressure
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.
fans came late on those car,like 212 and second fan comes on at 224,you reprogram it to come a lot sooner,,other thing is there might be gunk inside the block,and coolant has hard time to pass through,and staying longer than enough in block temp goes high,even tough the radiator is doing it's job,it is just coming out block lot hotter than it suppose to be,and gauge read the block not the radiator
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.
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.