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Why is my 2003 chevy malibu overheating and losing coolant only when i drive on the highway?

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Check to see if anything is restricting air flow through your radiator, sometimes bugs or cottonwood seeds plug up radiator fins. After that I would have cooling system pressure checked for leaks and tested for hydrocarbons.

Posted on Mar 27, 2011

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98 Chevy Malibu won't start after replacing thermostat?


replace thermostat did bleed coolant system check coolant level.because if not engine could have overheated and blowed headgaskets warp or cracked the heads check engine compression.sound like engine got too hot.

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Reset low coolant signal on 1999 chevy malibu


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My 2003 Chevy Malibu 6 cylinder seems to be losing power from time to time. I've noticed it uses a LOT more gas than it use to even on very short trips. When driving even on a flat road it seems t


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Aug 12, 2017 | 2002 Chevrolet Malibu

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I have a 2001 Chevy Malibu the overflow bucket keeps losing tha fluid and running hot but I don't see anything on the ground


could be leaking while your driving down the road. check the bottom of the hood and see if the cooling pump is spraying the coolant around(the coolant that comes Chevys is sometimes very corosive to the aluminum parts in your coolant system). should be a wet spot by were your belts are if the pump is leaking. try fushing your coolant.

May 02, 2012 | 2001 Chevrolet Malibu

1 Answer

My 1999 Chevy Malibu is losing the coolant though the overflow hose by the resevior I've had my head gaskets replaced there is no overheating no water oil mix, but my radiator fans arent working I


Sounds like you need to disconnect the Radiators' electric fans and have them tested. You absolutely must have them working, or your car will overheat. Check to see if the Temperature guage is working.

You need to go to a good autoparts store and have them test the fans and charge and test your battery. You may need some sensors to activate the Radiator fans, but you could be running the battery down with shorted cooling fans.

There are also Relays which work with the Radiator fans. The overflow will stabilize once the water gets into where it belongs. Make sure your Thermostat is not clogged with the sealer.

Jan 15, 2012 | 1998 Chevrolet Malibu

3 Answers

03 chevy malibu is overheating and water/coolant levels are being depleated very quickly.


What motor does it have. If it is a 3.1 the intake manifold gaskets are bad and it leaks internally. I have repaired more of these that i can count.

Jun 23, 2011 | 2003 Chevrolet Malibu

1 Answer

My Chevy Malibu just died out of now were and when I tried starting it the engine would shake really hard and there was lose of power I got it to start and drove it of the highway and now it will not even...


Jump timing? On a Malibu?? Possible, but EXTREMELY unlikely. I would buy an explaination more like overheated, bad crank sensor, etc. I would recommend having the problem diagnosed by a reputable auto repair technician, who can also give you an estimate of the cost to repair it.

Mar 08, 2011 | 1998 Chevrolet Malibu

1 Answer

I may have added too much coolant. After adding it, I drove for about 15 minutes. A few hours later, the tempurature gauge light came on. I check the coolant level again and there was nothing in the...


No, you can't add too much coolant. Rather, it does not hurt anything if you do. Did you add it to the radiator, or to the overflow tank?

Let it cool, then remove the radiator cap, and if needed, add coolant to the radiator. Put the cap back on, and fill the overflow tank to the "full - cold" line. Start it and run it a few minutes and look for leaks. If you find no leaks, drive it for a day or two, then let it cool and check it again. If it is down a lot (without overheating), you have a leak somewhere. If you lose enough coolant, that will make it overheat. However, if it overheats, that can cause loss of coolant, when you stop the car, you will see steam and smell coolant, and often hear it boiling.

If it overheats again, make note of when it happens: driving on the highway, or stop-and-go around town. Overheating on the highway usually indicates a clogged radiator, while in-town overheating usually indicates a bad cooling fan (you don't need the fan above about 30 MPH). A bad fan is usually the fan relay, but it can be the fan thermostat (different from the engine thermostat), or a bad fan motor.

Oct 10, 2010 | 1999 Chevrolet Malibu

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