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Low coolant light won't go off

Have 2000 Montana. Temps fluctuate alot and low coolant light won't go off. Plenty of coolant in radiator and reservoir.

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  • rdk856
    rdk856 Jan 01, 2014

    The other issue I am now having is that when I shut off the engine the coolant in the resevoir is bubbling almost like it is boiling. I am using the recommended coolant

  • Bill Boyd Jan 02, 2014

    The coolant is bubbling and the bubbling is the pressure escaping past the radiator cap. If the resevoir coolant is not hot or warm then havr the radiator cap tested as it may not be working properly


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  • Cars & Trucks Master
  • 42,217 Answers

Possible two faults. the wire to the low level sensor is broken in the plastic which is an indication of no water to complete the circuit. and the wire to the temperature sender unit is loose on the unit.

Posted on Jan 01, 2014

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Posted on Jan 02, 2017

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SOURCE: coolant in coolant reservoir did not fill low level in radiator

you must drain air out of system
so when engine is warmed up, just unscrew slightly the thermo time switch which is the highest sensor and unit in cooling system besides the reservoir, until alittle air releases then when antifreeze starts coming out then retighten to specs. BE VERY CAREFUL !!!! LOOSEN VERY SLOWLY AND NOT COMPLETELY REMOVE FOR THIS CAN CAUSE BURNS. MIGHT WANT TO USE A RAG AROUND SENSOR. If this doesnt solve it then make sure you have the correct rad. cap. Also that the filling hose is not clogged as well as the little port on radiator.

Posted on Feb 19, 2009

  • 179 Answers

SOURCE: coolant sensor

According to mitchell on demand there is no low coolant tep sensor, only standard ECT sensor.

Posted on Mar 28, 2009

  • 394 Answers

SOURCE: low coolant light is on but does not overheat and

There is a low coolant sensor down alongside the radiator. Either the wire came off or the sensor has failed. Other than the annoyance of the light being on if you keep an eye on the coolant level it will cause no harm.

Posted on Mar 28, 2010

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Why is my1997 chevy lumina low coolant light is on and the radiator is full of coolant ?

In most newer chevys, the coolant reservoir is part of the pressurized system. Rather than just holding overflow coolant and relying on the radiator pressure cap to draw from and expel to the reservoir, it is an active part of the cooling system. On these systems, there is a coolant level switch in the reservoir. This will activate if the level in the reservoir gets below a certain point. So it is possible to have a full radiator and still get a low coolant light. Be advised that as the reservoir ages and get stained, it is not uncommon for the low coolant sensor to give false indications of low coolant.

Sep 06, 2014 | 1997 Chevrolet Lumina

1 Answer

Van overheating

Pushing coolant into the reservoir is a symptom of a bad head gasket. Have the coolant check for combustion gasses. Easy test.

Aug 01, 2017 | 2000 Pontiac Montana

3 Answers

I have a Pontiac Montana (2000). That on my way to work the low coolant level light came on. and after work when I started it up the light did not come right away but it came on and there was no heat and...

No. It is not the thermostat. You are just low on coolant. The reason for the low coolant is either the fan is not working, the head gasket is blown, or the coolant system has a leak.
The fan is easy to check. When the temp comes up then the fan should come on.
The head gasket is easy to check also. Your oil will be milky white.
And if the radiator, radiator hose, or gasket leak can be harder to find.
The heater not working is because there is not enough water to heat the heater core.
PLEASE RATE. By checking Four thumbs ups!
Thanks! Have a GREAT DAY!

Oct 16, 2010 | 2000 Pontiac Montana

1 Answer

Low coolant light is on but does not overheat and has plenty of coolant in radiator and reservoir

Those sensors are bad all the time. It is the sensor on the radiator tank. They have fingers on them that trap air bubbles. You can try tapping on it, but that usually breaks it anyways. The fix is to change the coolant level sensor.

Anyways if that helps you any little bit, then feel free to follow me on Twitter. That one is at:

Thanks for the vote, and good luck!

May 15, 2010 | 1994 Chevrolet Lumina

1 Answer

Low coolant light is on but does not overheat and

There is a low coolant sensor down alongside the radiator. Either the wire came off or the sensor has failed. Other than the annoyance of the light being on if you keep an eye on the coolant level it will cause no harm.

Mar 28, 2010 | 1994 Chevrolet Lumina

1 Answer

I am try my best to give u describe and am not sure how to explain. on the rpm , there light on (its red and icon looks like arrow down with line curve and its like little square on top) and I try find...

I know. :)
This is your radiator coolant light. This means your coolant is low. There is a sensor in your reservoir tank that turns the light on your dash when the coolant is low in the tank. Use DEX-COOL for your Saturn. It's suppose to be red coolant, not the green stuff.

If there is plenty of coolant in the tank, the sensor itself maybe bad.

Jan 28, 2010 | 2000 Saturn SL

1 Answer

How much does it cost to repair crack in antifreeze tank?

are you talking radiator, or plastic reservoir?
the radiator is about $125.00 and the coolant reservoir
bottle is about $20.00 from a salvage yard

Nov 23, 2009 | 2000 Pontiac Montana

1 Answer

Low coolant temp light

STOP DRIVING!!!!.... if you have no coolant in the system you can ruin your engine.... if there is coolant inside the cabin then it is your heater core that is leaking.... it is difficult ot change on some vehicles becuase it is in the dash but still possible for the backyard mechanic.... you should be able to find one for about $100 but there is alot of labour involved...

Jun 18, 2009 | 2003 Pontiac Montana

1 Answer

Radio fuse keeps blowing - check tire pressure and low coolant lights come on - wipers will not go down when turned off

look for any leaks at the firewall and underneath the carpeting in your car. Mine did this a while ago and stopped when it was dry out. The check tire pressure is resettable by a little button under the right side of your dash next to - but under the instrument panel. Low coolant could be a leaking head gasket or intake manifold gasket(common), or a clogged radiator try having it flushed and look for any excessive coolant consumption or fluctuating coolant temps.

Apr 13, 2009 | 1997 Pontiac Grand Prix

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