Question about Chevrolet Malibu

2 Answers

REPLACED THERMOSTATE, TEMP(FAN)SENSOR, WATERPUMP AND THE CAR IS STILL BOILING THE WATER OUT OF THE OVERFILL RESEVIOR AND NOW THE HEATER STOPPED WORKING

Posted by on

  • lzack Feb 04, 2010

    WE HAVE DOUBLE CHECKED THE THERMOSTAT IT IS IN THE RIGHT DIRECTION, THE ELECTRIC FAN ARE WORKING, REPLACED TEMP SENSOR, THE HEATER CORE ALOWS COOL WATER TO FLOW THRU AND THE CAR DOES NOT OVERHEAT UNTIL WE PUT ON THE HEATER AND THEN IT STARTS TO BOIL BACK THRU THE OVERFLOW HOSE AND HARDLY AND JUST A LITTLE WATER IS PASSING THRU THE HEATER CORE AT THIS POINT WE ARE FLUSHING THE COOLANT SYSTEM TODAY AND PUTTING FRESH ANTIFREZZE IN HOPES THAT THIER IS A POSSIBLE AIR POCKET IN THE COOLING SYSTEM OR IF THE HEATER CORE IS BECOME PLUGGED. ANY MORE SUGGESTIONS?

    NO WATER IN THE OIL OR COOLANT IN OIL NO STEAM IN THE TAILPIPE. AGE OF RADIATOR UNKNOWN? MILES ON THE CAR IS 124,000 APPROX NO MAJOR PROBLEMS OR REPAIRS.

  • Richard Scordino May 11, 2010

    do you have any coolant in the oil? any oil in the coolant? any steam from the tailpipe? How old is the radiator? Did you put the thermostat in the right direction? Is the electric fan coming on? How long does it run before overheat from cold? No heat is due to heater core being air-bound.

×

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Chevrolet Master
  • 6,982 Answers

Your heater core has no idea if coo or hot water is passing through it. Either it flows or it doesn't. Run the engine till it is at normal operating temp with the cap removed and the front end jacked up on the corner where the fill is. After it reaches operating temp, turn it off, wait about three minutes and start it again. Turn the heater on high. Add coolant till it's full and let it run. It may overflow a little a few times but should not overheat.Make sure that you are adding a 50/50 mix as straight antifreeze will boil at a lower temp than does water. If you have any bleed ports on the engine you can open them if necessary. If the radiator is flowing properly everything should return to normal.
A partially obstructed radiator can appear to flow normally as the coolant goes around the restricted passageways. turning the heat on will never cause an engine to overheat even if it was totally plugged. Be sure there are no external obstructions as well (bugs or leaves packed into the A/C condenser or between the condenser and the radiator. It is sometimes possible for a head gasket to allow compression gasses to enter the cooling system. it will first fill the heater core, then push water out of the cylinder head passages. You can have a hydrocarbon test done at any shop to find out if this is happening. Your original problem was an overheat. Even if it was due to another problem, it can cause a gasket to fail or a cylinder head to warp or crack.
Try what I said and if that fails have the test done.
Good Luck!!

Posted on Feb 04, 2010

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 122 Answers

Clog in the heating manifold.

Posted on Feb 04, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Radiator fans not coming on. replaced thermostat and cooling sensor


Hi Bill, is the engine actually getting hot enough for the fans to come on? if the engine does have overheating problem (but you say the temp gauge reads normal) then i would check the operation of the engine temp switch, there are two, one for the gauge and one for the fans.

Oct 15, 2016 | 2006 Ford Escape

1 Answer

96 Jetta fans turn on only for 40 seconds, coolant boils over in overflow bottle


I just today actually fixed a similar problem in my honda my problem turned out to be the Timing belt was loose and not gripping to turn the water pump causing all sorts of problems with the cars temp. and water temp. including the fan not coming on, it sounds dumb but it worked for me just push on the belt and if it moves its loose. quick turn of a wrench and fixed.. Good Luck

Mar 18, 2012 | 1996 Volkswagen Jetta

1 Answer

I have 1996 dodge neon. temp gauge needle goes to hot. i have replaced the radiator cap, thermostate,fan relay switch,drained and refilled coolant, and a oil change, and temperture sensor. when i turn on...


Have you checked out the water pump? Most of the time, you can feel movement in the /head shaft area before it fails. Water pumps usually go slowly, pumping less and less water (making the engine run hotter). The also get noisy when they start to fail.

Jul 01, 2011 | Dodge Neon Cars & Trucks

1 Answer

Replaced coolant thermostate sensor and temp gauge is still reading below the cold line. what else could it be?


If you are getting good heat from your heater chances are it's the gauge that's faulty; however, often new thermostats can be defective. Put the thermostat in a pot of water & bring it to a boil observing when it opens. If it opens when the water is only warm then it's no good. If it's stuck open when cold, it's no good. Hope this helps, Good luck!

Mar 15, 2011 | 2001 Chevrolet Venture

1 Answer

My car's fanbelt broken on high speed and I saw the temperature raised so I stopped immediately before it could overheat but then I saw the water leak out.After replacing the fanbelt I put Water in again...


Hi,
You did well by shutting down quickly.
Why did the water come out when you stopped after the fan belt broke???
Residual engine heat. The engine has fiery explosions going on in the cylinders. Very hot.
Antifreeze flowing through the water jackets of the engine carry this heat away. Fan belt breaks, water pump stops pumping this very hot coolant away, engine temp goes up.
Thus the coolant temp rises enough to boil and push the coolant past the pressurized radiator cap out the overflow onto the ground.
I would recommend a fifty fifty blend of antifreeze and water for coolant. It just cools better.
Not seeing any leaks is very good. Smart thinking on your part saved you money.
Wayne

Feb 13, 2011 | Mazda MX-6 Cars & Trucks

2 Answers

I have a 96 sl saturn. takes half an hour for my car to reach running temp. When i start driving the engine cools down so far, to the point i have no hot air for my heater. I replaced the thermastat, i...


replace the thermostant again this time get a hotter temp thermostant and buy it from the dealer, the other thing is that these cars are known for the temp sensors being bad this would give you the false reading on the gauge but would not affect the heat, if its taaking a long time then i would replace the stant and this time or before replacing the stant i want you to flush out the heater core, remove the hoses from the heatercore and use a water hose to flush water through the heater core, a plugged core will not throw heat or will start to allow water to flow when it gets good and hot to flow through the retricted core due to rust and crud, try the flush first and then try a new temp sensor if the flush helps the heat, hope this is helpful good luck.

Jan 07, 2011 | 1993 Saturn SL2

2 Answers

My temperture gauge goes up and down. i change the waterpump. put new thermostate and still fanctuates. what else can it be.


Do you loose water after about 1hr driving if no then the temp sensor needs replacing But if you do loose water and the engine is getting hot then you have a problem.
You wasted your money on the w/pump as if that doesent work the water will boil from the top and stay cold at the bottom of the radiator.
Let me know how you get on Ron

Nov 24, 2009 | 2001 Toyota Camry Solara

1 Answer

I have a 2000 beetle without water temp signal water boils


The thermost is in a housing on the engine block that the top radiator hose connects to

Sep 16, 2009 | 2001 Volkswagen Beetle

1 Answer

Honda Accord 1995 temp sensor


maybe this will hel57436774p you

Feb 17, 2009 | 1995 Honda Accord

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

197 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

75005 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7710 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...