Question about 2002 Chevrolet Malibu

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2002 malibu boiling over replaced pump,thermostat,reserve tank and cap and tried to bleed air out still boiling over

Pump went bad put on new one and a superstat thermostat started boiling over after new stuff on ,bled air out of system still same thing.antifreeze too expisive to bleed everyday some air comes out then solid fluid close bleeder ,,good for while then boils over again. even put on new tank and cap

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  • Chevrolet Master
  • 2,101 Answers

I guess you have either the 3.4 or the 3.5 with the very common GM intake manifold like. . I do hundreds in my garage

Posted on Oct 29, 2012


6 Suggested Answers

  • 2 Answers

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

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Posted on Jan 02, 2017

  • 293 Answers

SOURCE: 1999 Malibu Overheating

i would take the radiator to a radiator shop and have it flow tested sometimes they are hard to bleed the air out i usually hook my coolant pressure tester up and push the air out

Posted on Sep 22, 2008

  • 112 Answers

SOURCE: overheating

Alot of times, the symptoms you describe could indicate that you have a lower intake gasket leak. Sometimes it is difficult to diagnose because the temp guage only reads the temp at a specific point and that does not reflect the temp at all points in the motor. I agree with the first suggestion that you shoud run your finger underneath the water pump pulley to see if the weep hole is leaking but it is more likely that you are sucking in air pockets through your intake gasket. Check the valley underneath your air inlet (on the top of the motor) for coolant. And also, green (glycol) based coolant has been known to damage aluminum radiators.

Posted on Oct 17, 2008

  • 60 Answers

SOURCE: Overheating

it could be air lock , very common on those engines, more likley is a slight headgasket leak

Posted on Nov 25, 2008

  • 79 Answers

SOURCE: 2002 Chevy Malibu - Oil in Coolant Tank

Sounds like your head gasket has a leak. I would also check your dip stick. If there is coolant mixed with the oil also. Then it is your head gasket.

Posted on Feb 03, 2009

  • 65 Answers

SOURCE: Help with cooling system!!

OK, firstly The basis that a cars cooling system runs on is very simple. The system is a pressurized cycle that moves the coolant around, along with the heat, and is slowest in the radiator to allow heat to escape. If the system is not pressurized then the cycle will not work properly and coolant will not move.
If there is air in the system this can create what would seem like a blockage. 'bleeding the system is not the answer especially if you are using the drain on the radiator. That drain is only for draining fluid not air.
If air blockage is the problem then what you do is open the system at the highest point possible. this is usually a hose at the top of the radiator or something, whatever is easiest. Then find the other hose attached to the radiator, lower, higher makes no difference. then simply squeeze the second hose. this will 'burp' the air out do this for a while until all that happens is fliud is pushed out repeatedly.
then reattach the top hose and top up the radiator, and go for a drive.
If this doesn't fix the problem then air is not the problem.

Posted on Jun 11, 2009

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1 Answer

2012 Chevy Malibu how to bleed the cooling system does this Malibu have a bleeder valve?

Leave the cap off of the surge tank and let the car run till the thermostat opens a few times to allow the air to escape. Then, put the cap back on the surge tank before shutting the car off.

Mar 24, 2018 | Chevrolet Malibu Cars & Trucks

2 Answers


Well one hot and one cool hose means the coolant is not flowing thru the radiator. That could be from a defective pump, closed thermostat, air in the system, or a blockage in the radiator. You might try running the engine with the thermostat out to check flow.

May 30, 2013 | Chrysler Cars & Trucks

1 Answer

The car was overheating i checked all hoses and replaced the thermostat the radiator it still is ovrheating and the water is boiling in the overflow tank

Answer could be a faulty thermostat,or it could be a sign that your head gasket is about to blow ,or last of all your timing could be out of sync.

Answer 2 from Inventus: It means your cooling system is funtioning properly. In a system having a coolant recovery tank, coolant in the radiator is always up to the brim, hot or cold. There is negligible or no air space. When coolant in the radiator expands sufficiently due to warming from the engine, it will squeeze past the pressure cap's bottom seal and flow into the recovery tank. (If no provision for such expansion was present, the expansion would rupture the radiator or your hoses.) Only coolant within the radiator is under pressure, and because of this pressure (together with the elevated boiling point that the "anti-freeze" permits), it normally does not boil. But once past the pressure cap's bottom seal, the overflow is at atmospheric pressure and therefore boils.
This boiling is usually unnoticed after a short, i.e., local, trip because the cooler coolant already in the recovery tank quenches it. But after some highway driving the influx of more hot overflow heats up all the coolant in the recovery tank to the (unpressurized, i.e., "natural") boiling point.
As the engine cools when shut off, the contracting coolant in the radiator sucks back coolant from the recovery tank. Fluid in the recovery tank should never be below the "full hot" or "full cold" marks, lest air be sucked in.
Your cooling fans are not turning on. It is not normal for your overflow tank to boil like that. It is true that your radiator is overflowing into the reserve tank, but that means yourr adiaotor is boiling. Check for blown fuses or relays for your cooling fans. IF theya re fine. run your engine for about 15 minutes and drive. When you temp level is at normal operating temp open your hood with the engine runing and see if your fans are on. If they are, then you may have a bad thermostat or a plugged radiator, or a bad water pump. If the fans are not on, get your cooling fan switch replaced if your car has one. Check your temp sending sensor

Oct 30, 2011 | Cars & Trucks

2 Answers

My 2002 buick century is loosing coolant fast. When car isn't running around 60-70 mph is seems to heat up more than normal and no heat or ac will occur. Should I replace the thermostat? I noticed the fan...

it sounds like one of several problems radiator needs flushed , water pump is bad or going, thermostat is bad, pin hole in one of the hoses, cracked head, hole in radiator, hole in heater core.if core is leaking you will notice water on the floor inside the car on pasenger side. if radiator has hole when you fill radiator with coolant it will leak froom fins sometimes only when hot. thermostat bad your car will read hot and or cold always. if stuck open cold, if stuck closed hot, after about 15 20 mins of running engine will cause radiator to boil over to over flow tank.never open radiator cap when engine is hot :) burn hazard.if pump is bad or going will notice gauge reads hot intermittent or always. will boil in to overflow tank. if head is cracked will notice water comming from side of engine block or in oil when you change oil. if radiator needs to be flushed will notice scale or gunk on radiator cap
(if you think you need help or do not have tools to perform please take to a machanic)

Mar 14, 2011 | 2002 Buick Century

1 Answer

Heating up just installed new thermostat but still heating up

did you burp the system before you started it? if not you will have to get all the air out of the system so the thermostat will work, if there is no water the thermostat won't open, and if the thermostat you put in did not have a small bleed hole you will have to remove it and drill a 1/16 inch hole in the thermostat then make sure the hole is at the top so the water will go past the thermostat and fill the block if it still over heats take the radiator cap off and have it pressure tested if it does not hold pressure then replace the cap, if the cap is bad the system will not pressurize and will allow the water and antifreeze boil. If you need more help let me know and thanks for using fix-ya.

Jan 19, 2010 | 2002 Dodge Intrepid

4 Answers

My car is running hot have new water pump i`ve check thermostat and doesn`t have one not leaking water no water on motor and trying to check too see if radiator have a butterfly to drain the water it has.

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.


Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.




You will spill some coolant during this air pocket purge test.......BEKIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!


Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat2_bing.gif open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may bepartially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do ahydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost


A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

Oct 07, 2009 | 1999 Chevrolet Malibu

3 Answers

Coolant coming out of reserve tank

In most cases like this, especially if the car is overheting in the meantime and you have white puffy smoke coming out of the tail pipe, it's a sure sign of a bad head gasket or worse...A cracked head.

I say this only if you notice that the reserve tank keeps filling up and building pressure. What's happening, is there is actual engine blow-by pumping its gasses into the cooling system. The result is what you might see there. The reserve tank fills up and the coolant (what's left of it) seeps and gets sucked into the combustion chamber and gets burned with the fuel. (Well, "steamed" would be a better term there....)

Again, IF that is the case, also look at your oil dipstick and the top of the oil cap. Do the stick and / or the underside of the cap look milky? That's another sign of your vehicle in need of some head work.

Considering the cost and labor involved, I sincerely hope that isn't the case! But just to be sure, those are some things you can check for.

Good luck and I hope this helps! :)

Sep 03, 2009 | 1996 Ford Taurus

1 Answer

Overheating and boiling in the overflow reserve tank

replace radiator cap system depends on good pressure to keep from overheating

Jul 27, 2009 | 2002 Mitsubishi Galant

2 Answers

Overheating,reserve coolant tank boiling I have a 2000 Ford Taurus with the similar problem. I had my water pump replaced then this started.

Ford 2000 Taurus

To solve the problem you have the things to do in this order;

) When the engine is cold top off the radiator with fluid. (When the pump was replaced the fluid should have been also)
) Make sure the radiator fluid has anti-freeze in it. This is also anti boil also !
) Add fluid to the overflow reservoir.
) Make sure the drive belt was replaced on the water pump.
) With the engine running, you can add fluid to the radiator for the first minute or so. You want to get air pockets out.
) Replace radiator cap.
) Let car warm up. When it's hot you should get the radiator fan coming on.
) When it get hotter the air-conditioning fan may come on.
) If the fan does not come on, the heat sensor is probably bad.
) If all fans come on, and it overheats, you may have a bad thermostat. Trace the upper radiator hose to where it connects to the engine. That's where it located.

Do not operate the engine when it overheats, You will damage the head gaskets and cause radiator fluid to leak into the cylinders.
If you smell radiator fluid in the exhaust fumes, it may already be leaking.

May 07, 2009 | 2000 Ford Taurus

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