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COOLANT LEVEL LOW INDICATOR LIGHT ON - 2001 Cadillac DeVille

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There is a small float within the coolant tank, if the coolant level becomes too low the indicator light will illuminate. Bringthe engine up to running temperature, look for any leaks, add coolant to the tank to the proper mark. It should note "leval when hot" this should turn the light off too. If not the float may be stuck in a down or "on" position.
I hope this may have helped,
Tom

Posted on Oct 02, 2009

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Hi Tammie, Is the coolant level low ? If not , The engine coolant level switch grounds the indicator with the coolant level in the coolant reservoir below the minimum recommended level. The engine coolant level indicator module is on the right side of the radiator just down below from the radiator cap !
Low Engine Coolant Indicator Always On

Step

Action

Value(s)

Yes

No

1

  1. Disconnect the engine coolant level indicator module connector.
  2. Turn the ignition switch to the RUN position.

Is the low coolant warning indicator ON?
--
Go to Step 2
Go to Step 5

2

Inspect for a short to ground in CKT 68.

Does a short to ground in CKT 68?
--
Go to Step 3
Go to Step 4

3

  1. Repair the short to ground in CKT 68.
  2. Inspect the system.

Is the repair complete?
--
System OK
--

4

  1. Replace the instrument cluster. Refer to Instrument Cluster Replacement .
  2. Inspect the system.

Is the repair complete?
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System OK
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5

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1 Answer

I have a red warning light that is activating on my 1999 Malibu Dash. It is on the lower right hand side & looks like a low water indicator. My fluid levels all seem fine.


If your collant level is ok, check your coolant level sensor. Its located on the coolant reservoir, usually at the bottom!! If faulty it will illuminate the low coolant indicator.

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Low coolant light came on 1999 Oldsmobile Silhouette, went out a couple minutes later without adding any coolant. Adding a little anyway after light went out. Now about 1 1/2 weeks later light came on...


If its not low on coolant and the light continues to come on it is the low coolant sensor in the radiator. This sensor is in the plastic side of the radiator and just pops off. These sensors are always a problem and don't always require replacement of the sensor. What happens -especially if you are using red DEX-COOL coolant is that the coolant gets hard and crusty inside the sensor and wont allow the coolant to enter and make contact with the sensor. Simply take the sensor off and blow compressed air or water pressure in it to free it of debris. Easy fix-hope this helps!

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Coolant level low light comes on and coolant level is not low in reserve tank or radiator.


There is a TSB for this problem. Here it is.


Bulletin No.: 04-06-02-007

Date: August 11, 2004

TECHNICAL

Subject:
Low Engine Coolant Level Indicator Always On (Diagnose Low Coolant Level System Operation/Check Sensor for Oil Contamination)

Models:
2000-2002 Buick Century, Regal
2000-2001 Chevrolet Lumina
2000-2002 Chevrolet Impala, Monte Carlo
2000-2002 Pontiac Grand Prix
2000-2002 Oldsmobile Intrigue


Condition

Some customers may comment that the low engine coolant level indicator is always illuminated.


Cause

The cause of this condition may be due to engine oil contaminating the coolant. Possible sources of oil contamination are internal engine leaks, improper service procedures, or the addition of some types of anti-leak additives to the cooling system. Once in the coolant, the oil leaves deposits on the level sensor creating an insulating film. This film results in a false activation of the coolant level indicator.


Correction

Diagnose low coolant level system operation and check the sensor for oil contamination using the procedure listed below.


Important: No coolant supplements should be used in GM cooling systems, other than what is approved and recommended by GM. The use of "aftermarket" over-the-counter sealing and cooling supplements may affect the operation of the low coolant level sensor. Discoloration of the coolant recovery bottle is normal and does not necessarily indicate that coolant contamination is present. Flush cooling system only when instructed by this bulletin.

1. Verify that the coolant is at proper level in the radiator and the coolant recovery bottle. If the coolant is low, add proper amount of 50/50 water and DEX-COOL(R) mixture. If the low coolant light operates properly, diagnose the cooling system for loss of coolant as outlined in SI. DO NOT proceed further with this bulletin.

2. Remove the low coolant level sensor. Refer to Coolant Level Module Replacement in the Engine Cooling sub-section.

3. With the key on, the engine off and the coolant level sensor disconnected from the vehicle wiring harness, observe the low coolant light:


^ Light is on - Chassis wiring or instrument cluster concern. Follow the appropriate diagnostic information in SI.

^ Light is out - Proceed to Step 4.



4. With the key off, connect the coolant level sensor into the vehicle's wiring harness. Connect a ground wire (1) to the battery negative terminal. Using a sharp probe (3) attached to the ground wire, ground the coolant sensor probe (2) as shown in the illustration. Make sure a good contact is made. With the key on and the engine off, observe the low coolant light for at least 15 seconds.


^ Light is on - Replace the low coolant sensor and re-check system operation.

^ Light is out - Proceed to Step 5.


5. Using a small wire brush or emery cloth, polish the low coolant level sensor probe to remove any film or oxidation. The probe should be a bright brass color when finished. Use Brake Parts Cleaner to flush removed deposits from the low coolant sensor probe. Re-install the low coolant sensor into the vehicle and proceed to Step 6.

6. Flush the cooling system and install new DEX-COOL(R) mixture as outlined in the SI. Check the vehicle's warranty history to determine if any engine gasket had recently been changed. If there has not been a recent gasket replacement, locate and repair the source of the engine oil contamination.


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1 Answer

What is the check gauges light


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If CHECK ENGINE light (2) is on, check engine oil pressure gage (3) and water temperature gage (4). If both indicate normal, proceed with mission and then notify Unit Maintenance. If either one does not indicate normal, stop engine immediately and notify Unit Maintenance


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Help


Hi Amber

This is the Low Coolant Level indicator. You may need service soon. Hopefully, you are just low, however, it could indicate other problems (minor or major).

NEVER remove the radiator cap while the coolant is HOT!

Here is info straight from your owners manual:
Low Coolant Warning Light
This light comes on
briefly when you turn
your ignition on.
If this light comes on and stays on and you hear a chime,
the vehicle should promptly be pulled off the road and
the coolant level checked.

Jun 15, 2008 | 1999 Chevrolet Malibu

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