Question about 2005 Chevrolet Impala

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2004 impala, temp gage is sparatic pushing coolant back into overflow tank.car dosent seem to be hot even when temp is high. Replaced t-srat and cap.I see bubbles in overflow tank,not all the time.heater not working all the time.Head gasket?

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  • Chevrolet Master
  • 803 Answers

Possible head gasket, but make sure cooling system was purged properly, air pockets in the system could cause your symptoms.

Posted on Feb 17, 2014

  • curt bennett Feb 17, 2014

    I blead the system using the bleeder valve, is there another way to do it

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  • Expert
  • 85 Answers

It's the head gasket.

Posted on Feb 17, 2014

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  • Chevrolet Master
  • 21,873 Answers

Could be.
Are you sure the radiator is full, and are the heater hoses getting hot ?

Posted on Feb 17, 2014

  • curt bennett Feb 17, 2014

    yes and yes

  • curt bennett Feb 17, 2014

    on second fhought just the top heater hose was hot

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Posted on Jan 02, 2017

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SOURCE: 2004 impala coolant level

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.

Posted on Aug 15, 2008

SOURCE: Oil in over coolant tank

since you are running green coolant in a car designed for dexcool that may have contributed to a leaky intake gasket and/or head gasket. dexcool was specially formulated to run in the GM vehicles because the gaskets and seals can be easily distorted when the wrong chemicals are soaking them. oil in the coolant is usually either a head gasket or the lower intake manifold leaking into the cooling system. also if the intake gaskets werent done properly that would cause oil in the coolant as well. i suggest you take your car to a reputable shop and have it tested for a headgasket leak and to have the lower intake inspected.

Posted on Feb 17, 2009

  • 6982 Answers

SOURCE: 2004 Chevy Impala no heat from defrost or heater

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!)

Posted on Sep 22, 2009

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1 Answer

My 2004 3.4 6cyl base impalas "hot coolant temp" light came on and the reservoir tank is half way full now when cool. It wasn't a week ago, I haven't added any fluids, what could be the problem?


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

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You need professional help
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My Chrysler Pacifica is running hot i have coolant what could be the problem


The overflow tank or radiator cap may not be holding the coolant under pressure. Try replacing the cap which would be cheaper than ant other fix.

Jan 09, 2012 | 2004 Chrysler Pacifica

3 Answers

I replaced my radiator on my 2004 with a 2.2 and it seems like the thermostat is not opening. It can not get the air out. It seem to just to over heat and push the coolant out. Randy


REPLACE THERMOSTAT IF TOP COOLANT COOLANT HOSE GOING TO RADIATOR IS HOT TO TOUCH THERMOSTAT OPEN. TO BLEED COOLANT SYSTEM FIRST YOU NEED TO ADD COOLANT TO THE COOLANT OVER FLOW JUG UNTIL COOLANT LEVEL STOP DROPPING AND STAY AT FULL COLD MARK.WAIT 3 MINUTES IF COOLANT DROPS ADD MORE COOLANT UNTIL COOLANT STAY AT FULL COLD MARK.WITH RADIATOR OVER CAP OFF CRANK ENGINE FOR MINUTE WATCH COOLANT LEVEL AT OVERFLOW JUG.IF COOLANT DROPS ADD MORE COOLANT IN THE OVERFLOW JUG.WHEN COOLANT LEVEL STOP DROPPING IN OVERFLOW JUG.SCREW BACK ON THE RADIATOR CAP TO OVERFLOW JUG.WHILE ENGINE IDLING WATCH TEMPERATURE GAUGE WHEN TEMPERATURE START CLIMBING TURN OFF ENGINE WAIT A WHILE KEEP FROM GETTING SCALDED.WHEN COOLANT COOL DOWN SOME. PLACE A LARGE RAG OVER THE COOLANT OVERFLOW JUG OPEN CAP LITTLE AT A TIME UNTIL PRESSURE RELEASED, THEN REMOVE CAP ADD MORE COOLANT IN THE OVERFLOW JUG TO THE FULL COLD MARK.THEN REPEAT THE PROCESS SCREW BACK ON THE COOLANT OVERFLOW RADIATOR PRESSURE CAP.THEN START ENGINE WATCH TEMPERATURE GAUGE WATCH COOLANT TEMPERATURE GAUGE WHEN COOLANT TEMPERATURE START RISING TURN OFF ENGINE AGAIN WAIT UNTIL ENGINE COOL DOWN ENOUGH TO KEEP FROM GETTING SCALDED TAKE PLACE LARGE RAG OVER RADIATOR CAP WHICH IS THE COOLANT OVERFLOW JUG CAP OPEN CAP LITTLE AT A TIME UNTIL PRESSURE RELEASED ADD COOLANT UNTIL AT FULL COLD MARK. WHEN YOUR COOLANT LEVEL STOP DROPPING.AND TOP RADIATOR HOSE VERY HOT THERMOSTAT OPEN AND AIR IS OUT THE COOLANT SYSTEM. MAKE SURE YOUR COOLANT OVERFLOW JUG HAS COOLANT IN IT,WHEN ENGINE COOL DOWN CHECK COOLANT OVERFLOW JUG KEEP COOLANT LEVEL AT FULL COLD MARK.BECAUSE IF OVERFLOW JUG IS EMPTY THATS A SIGN RADIATOR COOLANT LEVEL LOW.WHEN OVERFLOW JUG EMPTY IT WILL ALLOW AIR GET IN THE COOLANT SYSTEM AND CAUSE CAR TO OVERHEAT.WHEN REPLACING THERMOSTAT ALSO REPLACE THE RADIATOR CAP ON THE COOLANT OVERFLOW JUG.

Aug 09, 2011 | 2004 Oldsmobile Alero

2 Answers

If radiator is replace and there is still a water leak problem. What could it be?


Water pump, radiator hoses, coolant overflow tank could be cracked . Even the coolant tank cap. Check the cap to see if the gasket is intact. If it looks stretched and worn, get it replaced.

Jul 22, 2011 | 2004 Dodge Stratus

3 Answers

My subaru 1996 250t non turbo over heats after running for awhile, radiator emptys out, dosent seem to have any holes/leaks but there is water on the underside of hood surgesting it coming out of radiator...


refill rad start car wait 3- 5 min now look in rad since you never put rad cap on

if low fill
if not low check temp gage if high them it's time for thermostat if reaching temp slowely make sure rad fan coming on
no fan ? check fuses and releys both good then it's a sensor and will likely require a quick trip to see boby da mechanic

Jan 16, 2010 | 1993 Subaru Legacy

1 Answer

Heater problems


Did you bleed the air oout of the cooling system - Their is a bleeding next to the therostat housing.


1 - When the vehicle is cold remove the rad(tank) cap and top up the level if needed

2 - start the vehicle with the rad cap off and leave the car run until you can see that the therostat has openned(look in tank/rad) to see fuild flow then open the bleeder slowly to let any air out of the cooling system. Once you have coolant flowing out of the bleeder close the bleeder and install the rad/tank cap.

NOTE - Be careful with the engine running and hot Coolant.

You make need to bleeding system 2-3 time to get all the all out. Once all the air is out of the system you problem should be solved. If air returns to the coolant system have the system checked for possible head gasket leaking air into the coolant system

Nov 19, 2008 | 1997 Dodge Intrepid

2 Answers

2004 impala coolant level


The coolant container (called the overflow reservoir) will be marked as to what constitutes MIN and MAX levels that should be in it. If it's low, add coolant.

As for what temperature it should run at, the gauge on the dash is just a general indication, but usually it runs close to the middle of the gauge's range.

Aug 08, 2008 | 2004 Chevrolet Impala

2 Answers

Temperature gage has fluctuates between 100 and 260, the water is full and fan seems to be working ok, and all belts seems to be ok.


You need to verify that the gage is accurate, if it is then the cause is the thermostat, but check the gage first, a repair shop can do this or you can feel the air coming off the radiator fan, if it is really hot changing to cool rapidly then the T-Stat is sticking open.

Aug 01, 2008 | 1997 Jeep Grand Cherokee

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