2000 Chevy Malibu Overheating

Posted in Ignition Systems | Asked on Aug 16, 2010

The car was running fine, temperature wise. It started to get hot and we realized a fan wasnt running. It turned out to be the relay so we replaced it. The car never over heated thankfully. At the time, the heat would work as long as you were driving. NOW the car is overheating. According to the gauge inside the car, its gets hot, over heats and shuts down, then magically the temperature drops to normal. We cant find any leaks, so I figured the thermostat was bad and was pushing coolant out the over flow. Replaced the termostat. It is still over heating and now the car doesnt have any heat at all. I checked the floor board and it isnt wet, so I wasnt thinking heater core. The car isnt smoking but when you turn the heat on it blows cold and the lights dim. I dont think the water pump is bad but its a possibility. What should we do next? The oil/water and water/oil also checks out… so i dont think/hope the head or block isnt cracked.

There are 4 Answers for "2000 Chevy Malibu Overheating"

  1. American Man says:

    Head Gasket would be the worst case.
    You can sometimes tell by seeing water coming out the tailpipe.
    On cold days some water will come out to start. But if it keeps coming out its a head gasket, or worse. ( Block)
    Start the cheapest way possible first. Like if the water pump runs on a belt, change the belt. If its elect. then go for the water pump.
    If the fluid level goes down you have a leak, if it stays there and still gets hot it probably the pump, or to strong a thermostat.
    If all this checks out then you have to decide if you want to put the money into having the engine worked on.

    Could take off the radiator, and to a shop to have them check if it needs to be cleaned out or just replace it.

  2. Bob T says:

    Water pumps rarely go bad, they just leak. If the heater is cold it sounds like the thermostat is not opening. Could be an air pocket in the cooling system. Is the radiator fan going on soon enough?

  3. don r says:

    The first time it got tooo hot a lot of coolant boiled away. This must be replaced. There is probably air in the block which needs to be purged. Water isn’t making it into the heater core or your heater would heat the cabin. The dimming symptom is just ugly and makes little sense. Something in the blower circuit is drawing more current than it should and for a car this young there’s too much wrong.

  4. Fungus says:

    My guess goes toward the intake gaskets, if you have the v6 it’s a common problem. Is it loosing coolant, but cant tell where? This is a tell tale sign of bad intake gaskets, but it doesn’t always end up like that.If your heater core in this vehicle leaks it has a thingamajig(not a technical name, of course)that makes it leak on the ground instead of in the car.you say that there is no water in the oil, but there may just not be enough to notice.All of these symptoms could be caused by bad intake gaskets.And when one of these engines is overheated, the intake gaskets are the first to go, though usually they are the cause of the overheating so it doesn’t matter anyway When somebody brings one of these jobs to me, i charge about $450, most other places in my area charge almost 600, and I’ve heard of some cases in the city where they charged 800-900, but that’s f-in ridiculous.

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