Question about 1998 Cadillac DeVille

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Low coolant light stays on. added coolant and is still on.

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  • Master
  • 4,044 Answers

Did you add the fluid to the Radiator or the Overflow container. The radiator should be full and the overflow container should have a mark on it for full. Make sure both are full. If they are then you most likely have a bad sensor that you will need to locate and replace.

Posted on Aug 08, 2010

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Posted on Jan 02, 2017

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ndguy2481
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SOURCE: check eng light

1 Inspect Oil Pan Gasket - Performance Ruptured, cracked or leaking radiator hose. grey_line.gif 2 Inspect Hose (Bypass) Ruptured, cracked or leaking bypass hose. grey_line.gif 3 Inspect Hose (Heater) Ruptured, cracked or leaking heater hose. grey_line.gif 4 Inspect Radiator Cap Worn or damaged radiator cap grey_line.gif 5 Inspect Heater Core Heater core may be leaking antifreeze/coolant into the vehicle`s floor area. grey_line.gif 6 Inspect Heater Control Valve Leaking or defective heater control valve. grey_line.gif 7 Inspect Radiator Drain Plug Loose, damaged, or faulty radiator drain plug. grey_line.gif 8 Inspect Radiator Rusted, corroded, or damaged radiator may be leaking antifreeze/coolant grey_line.gif 9 Inspect Water Pump Damaged, worn or leaking water pump. grey_line.gif 10 Inspect Cooling System Mix Coolant level low or flow is restricted. grey_line.gif 11 Inspect Head Gasket - Performance Blown head gasket grey_line.gif 12 Inspect Hood Brace Leaking, worn, or damaged intake manifold gasket grey_line.gif 13 Inspect Freeze Plug Freeze plugs are cracked or leaking.

Posted on Dec 02, 2008

ftw1952
  • 10319 Answers

SOURCE: low coolant light stays on.

A relay does run the sensor as well

Posted on Jan 15, 2010

  • 574 Answers

SOURCE: Low coolant warning light stays on.

Bad coolant level sensor in the tank. Look around the bottom of the reservoir and find a plug connection, unplug it and see if the light goes out. I think the tank has to be replaced dont think you get the sensor out. You could try by take the tank off and see if it will come out of tank but I dont think it will.

Posted on Sep 03, 2009

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michigan man
  • 3533 Answers

SOURCE: 01 mercury sable traction control & low coolant lights stay on.

check for something stuck in the wheels and as for the coolant light get the car running and up to warm temp and start adding coolant to the reserviour bottle until it is up to hot level because there maybe a bubble in the line but also if might be a bad switch in the reservior bottle itself

Posted on Jan 11, 2009

  • 2 Answers

SOURCE: coolant light stays on after coolant was added

your sensor on the coolant buckit is not reading the level of the coolant it mite be bad

Posted on Apr 04, 2009

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Related Questions:

1 Answer

And? why does low coolant light stay on when it has coolant? and where is the sensor?


There is not enough pressure in the system and the warning light goes on. By adding the necessary coolant the pressure will go up and the light will go out.

Mar 13, 2016 | 2002 Pontiac Grand Prix

1 Answer

Low coolant light stays on until system heats


Your overflow tank(aka coolant recovery reservoir) is low on coolant. The coolant expands when warm and raises the level in the tank, which turns off your light. Top off the reservoir (when cool) to the "Full Cold" line. If you have to keep adding on a regular basis, then you have a leak somewhere in your cooling system, could even be the reservoir itself.

Oct 18, 2015 | 2000 Buick Century

2 Answers

I just bought a 2003 Toyota Echo and when I start the car up, the blue "low engine coolant" light stays on for about a minute before shutting off. I've added coolant, so I know it is full,...


Make sure there is no air in the system, take the radiator cap off and let the engine idle for half an hour, as the air comes out the coolant will go low, ad more coolant and then close the cap on also make sure the resevour bottle is at its mark.

Sep 16, 2011 | 2003 Toyota ECHO

1 Answer

Ok my 94 corsica would not start.i noticed the coolant was low so i added to it and it started right up and ran fine,12hrs later the same thing i t would not start.i added more coolant it started up ran a...


coolant has no bearing on whether the car starts, you have a major issue i think and its called a head gasket perhaps if u can get me more information i might be able to walk you through it

Aug 28, 2010 | 1994 Chevrolet Corsica

1 Answer

1997 GEO Prism engine light is on. Auto Zone says something is going on with my coolant system. Car has been sitting up for a year. Coolant was low so I added some. What would you suggest?


I had the same problem in my Subaru.It was low on coolant and ran just a little hot for a couple of minutes, and the "check engine" light came on.After adding coolant and resetting the light it never came back on.So, try resetting the light by unplugging the positive end from the battery for a few minutes, and then plug it back in.See if it will stay off, if not you may need to change the temperature sensor located near the thermostat on the top of the motor where the top radiator hose runs into the motor.

Jan 20, 2010 | 1997 Geo Prizm

2 Answers

Low coolant light is still on after adding coolant.


you either hav an air buble in the system or a bad sensor

Jan 12, 2010 | 1998 Pontiac Grand Am

1 Answer

01 mercury sable traction control & low coolant lights stay on.


check for something stuck in the wheels and as for the coolant light get the car running and up to warm temp and start adding coolant to the reserviour bottle until it is up to hot level because there maybe a bubble in the line but also if might be a bad switch in the reservior bottle itself

Jan 11, 2009 | 2001 Mercury Sable

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