Question about 2000 Saturn SL

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"low coolant" light on

But my reserve tank is full. ??

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  • Anonymous May 11, 2010

    That doesn't answer the question. Is the coolant low in the engine?

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The low coolant level sensor is not working. This fault could be due to a defective sensor or related wiring.
How many wires go to that sensor (1,2,or3)?

Posted on May 10, 2010

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HOW TO LET THE AIR OUT THE COOLING SYSTEM ON A 2002 JEEP GRAND CHEROKEE


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So, my 2001 V8 Jeep Grand Cherokee Laredo is very slowly leaking coolant. I replaced the heater core in 2009 and the symptoms that the Jeep expressed then are not happening now. However, the low coolant...


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My car is leaking antifreeze onto the ground under the reserve tank. It is not overheating and of course after the coolant has leaked out my low coolant light comes on. I added more but there was still...


If your coolant light turn on sometimes, and you can check that your coolant level is low, definitly you have a leak.

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Hope this help (remember rated and comment this).

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Replaced water pump, alternator, radiator, crank sensor and no coolant leaks and car has antifreeze, but why is low coolant dashboard indicator light keep flashing on 97 saturn sl2


Inside the coolant reserve tank there is a sensor for coolant level.


Over time,this sensor can get stick.


Inspect the coolant reserve tank for crack or leak.

Locate the coolant level switch/sensor and soak it in clean warm water.

Make sure it's free to move up and down the float path.

Top off the coolant tank with coolant only.



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YES. But dont overfill it. Slowly add coolant to the low full line and let it run a while, like 10 minutes. if the level goes down fill it to the full line. After it cools for 30 minutes recheck the level and add as needed.

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Temperature/heat wont work/dashboard lights on and off


It sounds to me like you're low on coolant. When you checked the coolant level, did you actually open the radiator cap and make sure the radiator is full? The plastic tank you generally add coolant too is actually an 'overflow' or 'reserve' tank. There is a hose that runs from that tank to the top of the radiator so if the radiator gets low on coolant, more coolant -should- run in from the overflow tank. However in practice this does not always work. I have a Jeep that leaks coolant and experiences this exact same problem. Coolant will not run from the reserve tank into the radiator because the hose is plugged up, and whenever the radiator gets low on coolant the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

Feb 12, 2009 | 2001 Pontiac Sunfire

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