Question about 2002 Chevrolet Malibu

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My Malibu dumps all of its antifreeze only at times. Seems to happen when im idling for any longer length of normal time. But after the reservoir is filled again, there are no leaks. It seems to come from around the area of the reservoir, but cant pinpoint where. Is this a thermostat problem?

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Sounds like a thermostat,but as the car is eight years old it would be wise to start with that .....

Posted on Aug 19, 2010


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Posted on Jan 02, 2017


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could be the overflow pipe that leads from the reservoir is blocked check it out and replace happened to my car

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If its coming from the reservoir lid, something is causing overheat. Most likely fans are not working. You can test the fans themselves by pulling the plug off of the sensor about midway up the drivers side of the radiator. short the 2 similar contacts and both fans should come on low speed. short right contacts and they should come on high. if this works your fans themselves are good. look at the fan relay (mounted with 2 bolts under the reservoir) or the temp sensor itself.

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Car loses water from overflow cap. Replaced water pump, thermostat and overflow bottle and cap.

Stop me if this has NOTHING to do with your problem (or if it's already been solved)...I don't know a lot about cars so...My Ford Taurus kept overflowing antifreeze from the reservoir cap. Car started to over heat and kept spilling"/dumping" antifreeze every time I turned the car off. The antifreeze reservoir had been replaced less than a year prior, and water pump, radiator, etc looked at. I got a free estimate that stated my water pump was NOT the issue, but I did need a new radiator and my reservoir tank needed to be replaced (again)....$800 parts and labor.... However...I noticed the overflow holes on the tank, and also that the orange liquid (antifreeze), was also spilled around the cap lid. I also noticed the CAP on the antifreeze reservoir would loosen when tightened completely- hence, not sealing correctly. So I went to the dealer, bought a new reservoir cap for $15, replaced it, and never had an issue after! I also found out that the CAP was a DEALER PART ONLY, and when the tank itself was replaced, the CAP was the OLD one! Problem fixed! Maybe it's similar? Or something "more serious".

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1 Answer

I have a 2000 Chevy Malibu. Yesterday we were checking all my fluids and they are where they should be, including the oil. When we check the antifreeze, there is oil in the reservoir, a thick, black layer...

Are you sure it is oil? I have a 2000 chevy malibu also and something similar happened to be but come to find out the radiator just needed to be flushed out and it was old rusty deposits.

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1995 Buick regal- filled the coolant reservoir with antifreeze last Sunday to the cool temp line. (antifreeze was straight and not 50/50) checked the radiator and there was coolant all the way to the neck....

Check all around the intake manifold gasket for evidence of antifreeze. Also check your oil for evidence of coolant. The Dexcool antifreeze used in GM engines can cause the intake gaskets to deteriorate causing coolant leakage. Very difficult to detect.

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Where is the coolant tank to replace antifreeze in the 2005 chevy malibu? what identifying code or numbers is on the cap?

The coolant reservoir is on the passenger side of the vehicle. It will look similar to this.


If the coolant is original you will need to top off with "DEXCOOL" coolant. It is an extended life coolant and should not be mixed with regular green coolant.

If the coolant has been serviced most of the time they will flush out the dexcool and fill it with normal coolant. If the coolant looks green than this is probably true and you can add regular green coolant.

If your not sure what is in it there is a product approved for "all makes/all models".

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1 Answer

Antifreeze leak

had this same problem . it was the reservoir had a crack in the bottom, it is something you can do at home but it takes alittle time hardest part was gettin the hose back on the reservoir. and by the way the reservoir cost is about 250 and some change.

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is electric radiator fan coming on? if not the relay or fuse is bad

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Get a new cap it it still happens replace the coolant tank.

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