Question about 1995 Chevrolet Lumina

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Thermostat Car overheated making the temp gauge max out to the top and the hot light came on. Checked the coolant level when it cooled down and it was a little low, but not much. Topped it off. Car had cooled down for about 4 hours. When I got in and started it, the gauge needle was still past the red and the hot light came on instantly. It wasn't hot. This was about a week ago. I've been driving it since with these problem, but the car doesn't seem to be overheating. I did drive it today in the Las Vegas 100 degree heat and after about an hour of driving it seem to lose some "get up and go" power, but wasn't steaming when I stopped and checked. Might this be the thermostat needs replacing? Thank you, Dennis

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  • drockin16 May 17, 2009

    Yes, it has coolant in it now. Yes, every morning when I go to start it the gauge is still all the way to the top and the light comes on immediately upon starting it.



    Thank you.

  • drockin16 May 17, 2009

    Thanks for the info. I'll check the sensor later on this evening and reply back with what I find out. My wife was driving it the first time it overheated and I don't believe she would be pushing it too hard. I didn't notice it spraying coolant in the overflow when idling. I'll let you know about the sensor.



    Thanks again for your help.

  • Wayne Holden May 11, 2010

    Find the temp sensor and unplug it, start it and see what the indications are now. If no light and no indication, change the sensor. Before you buy one, inspect the wiring and make sure it hasn't gotten against something and melted together causing the bad indication.

    When you originally said it had overheated, was there anything else going on? Traffic jam, pushing it hard, anything other than just driving down the highway.......

    Since you know it has a full load of coolant, did it lose any when you drove it? If just sitting in the driveway idling and it starts spraying coolant out the over flow/relief tube even before it has time to get warm, that indicates blown head gasket or cracked head, which is the worst scenario and we don’t want to go there.

    Keep your eye on the coolant level as long as this problem is not solved cause you don’t want to overheat it any more often than absolutely necessary.

    Good Luck.

  • Wayne Holden May 11, 2010

    Has it got any coolant in it at all now? One thing about putting coolant in is if it doesn't get circulated throughout the engine and heater circuits, it isn't full.

    It is possible that you have blown a head gasket or have a failed water pump. The head gasket lets high pressure air from the cylinders pressurize the water jacket and pushes all the water away from the engine and usually out on the ground. The failed pump just doesn't push the water around so it has to move via the old Model T method, cool to the bottom, hot to the top, not good enough these days.

    Are the gauge and light on in the morning after not being run all night?

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I would say its the temperature sensor that is your issue, replace it and see what happens but make sure its the right one. Theres one for the gauge and light and one for the computer, the one you need to change will be the one that when you unplug it the gauge will fall to cold. They are normally either in a cylinder head or in the thermostat housing.

Posted on Jul 10, 2009

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