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Low water light comes on and water is full - Cars & Trucks

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The sensor that is used to trigger this light can become corroded or even inoperable due to using water instead of coolant. Check the connections and rinse off the sensor with water. You may have to replace it.

Posted on Mar 25, 2014

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Posted on Jan 02, 2017

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The coolant light comes on even tho the coolant is full could it be the fan


the coolant light needs water to keep the light off. Check the coolant level in the radiator and not the reservoir. If the wire to the sender unit is broken or not making good contact then the low light will also come on.

Dec 29, 2013 | 1998 Ford Mustang

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Low coolant light comes on but the coolant is not low


hi my ford transit recovery truck 1997 on a p reg has a light on dashboard
stating that the the radiator is low but the coolant is full of water. please help

Sep 21, 2012 | 2000 Ford Taurus

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LOW WATER LIGHT


I am assuming you are talking about the washer fluid.
If the tank is full and the light is on the sending unit has failed.
Same thing would be true for the coolant if it has a low coolant light and the radiator is full.

Aug 22, 2012 | 1994 Chevrolet Caprice Classic

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Light for water is coming on but coolent is full


what color is the light.....as there are 2 lights, one is red, and comes on if water is low or suspect...and then there is the blue light that comes on when you start the car and goes off as the engine heats up.........

Feb 21, 2011 | Saturn SL2 Cars & Trucks

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"Check your gauges" light come on when I come to a


you are low on oil in the engine- brake hard and watch the pressure gauge it will drop also---you are at least 3 qt's low.

Jan 01, 2011 | 1998 Dodge Ram 1500 4WD

1 Answer

My low coolant light keeps coming, i replace the Thermostat on yesterday but got in car this morning and light came right back on put water in and drove to work when i got to work cut car off look under...


Low coolant doesnt have anything to do with the thermostat. If the coolant bottle was over filled, it will push out, it needs some air space. only fill it to the full line. If the low coolant light is on, but its not really low, the sensor may be bad. Be sure to use the correct coolant DEXCOOL.

Nov 17, 2010 | 1999 Pontiac Grand Am GT

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Light came on instrument panel. looks like a water pump light.


bet it's the low coolant light. There's a senser on the side of the raditor that tells if the coolant is low and it'll come on if there's straight water in the cooling system too it'll come on if the coolant is low it'll come on if it fails and all of these are as common as the other. Sometimes you can disconnect and reconnect the senser and it'll reset ifthe raditor is full of coolant but it can go bad too just as often, Sometimes you can just unplug it and it'll not work but you;ll not know when your low if you do. New sensers are dealer idem.

Sep 17, 2010 | 2005 Ford Mustang

2 Answers

1999 Olds Alero. Low coolant light comes on and stays on even though its full. Starts running hot to the 3/4 mark. When the heater is turned on it cools off. Could this be the thermostat or the water pump.


TAKE RADIATOR CAP OFF WITH ENGINE COLD AND CHECK WATER ..MAKE SURE RADIATOR NOT BLOCKED,,PLASTIC BAG ETC. THIS SOUNDS LIKE LOW WATER OR RADIATOR ..STOPPED UP INSIDE ..IF YOU HAVE GOOD HEAT IT'S FULL OF WATER. REPLACE T STAT B4 RADIATOR..IT'S CHEAPER. ALSO CHECK FOR RADIATOR COOLING FAN OPPERATION..I,M RULING OUT THE WATER PUMP.

Mar 20, 2010 | 1999 Oldsmobile Alero

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