Question about 2002 Chevrolet Impala

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Intermittant low coolant light. Have flushed system, replaced low coolant sensor

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  • Anonymous Oct 21, 2008

    t low coolant light. Have problem, and notify you when new solution is offered.

  • carole10 Nov 11, 2008

    Low coolant light stays on, coolant level is fine

  • nooche Nov 28, 2008

    low coolant light stays on but coolant is full and rad hose to thermostat is soft not hard no pressure in rad hose

  • Anonymous Nov 29, 2008

    I have a 2001, picked up a new sensor today and will install it tomorow...

  • TIMMERS48 Feb 18, 2009

    01 impala low coolant light stays on .coolant level fine does not over heat



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The coolant sensor located in the radiator is either gunked up or faulty if the fluid level stays ok.. The sensor is located on the engine side of the radiator about 3 inches from the top on the right side looking from behind the steering wheel

Posted on Jan 16, 2009


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3 Answers

Can either of these codes cause my 1999 Oldsmobile bravada SUV to over heat: P0442 ornP1361 or P0117??

code p 0442 refers to EVAP system so that is unlikely
check the fan operation and if you have a viscous fan hub ( fan clutch ) replace it
if you have electric fans , check coolant temperature sensor for operation , fuses , relay and fans
overheating is from low coolant levels , head gaskets/cracked heads, blocked radiator cores , fins flaking off core tubes, incorrect timing, blocked exhaust( cat converter)problem thermostat, over loading /over speeding, overdrive not engaging
if you over heating is predominately at lights , slow moving traffic or high engine rpms with low speed --check the fan operation and if it is viscous fan hub driven --replace the hub or if electric fans have that circuit checked out

Sep 07, 2016 | 1999 Oldsmobile Bravada

1 Answer

1998 Pontiac Sunfire has a low coolant light on I changed the sensor thermostat and flushed the system including bleeding the light is still on and has no leaks and the reservoir tank is full what's...

low coolant sensors work by the fact that they need to be completely covered by water. There is current to the sender that earths out through the coolant to the engine and back to the battery earth wire.. This circuit hols a relay open so that no lights come on. When the circuit is broken ( low water --broken wire) the relay clicks in and the lights come on to let you know that there is no coolant in the system before there is damage done to the engine. So check that there is coolant. in the radiator right up to the cap ( not some in the radiator) and check that the wire is not broken at the sensor.. You may not have bled all the air out of the system (air lock) and this is affecting the sensor because there is not always water around it.

Jan 17, 2014 | Cars & Trucks

1 Answer

Why is my low coolant light on in my 2002 impala ls?

check the coolant level in the rad and the overflow bottle.if these are good then you may have a problem with the coolant level switch being either dirty and can`t read the level or its not working properly and needs replacing.also if the coolant system has not been flushed then the contaminated coolant can cause the sensor to either not read properly or go bad.

Dec 07, 2011 | Cars & Trucks

1 Answer

Low coolant light stays on

If you've checked your coolant level and it is ok, then more than likely engine oil is contaminating your cooling system. GM published a service bulletin on this exact problem. Possible sources of contamination are internal engine leaks, improper service procedures, or addition of excessive antileak addatives into the cooling system. The problem occurs when the oil leaves deposits
on the "low coolant warning sensor" which causes a false reading and puts the light on. The sensor is mounted on the right hand tank of the radiator. Flush the cooling system, replace the sensor, and add the proper amount of O.E. recommended coolant.

Sep 16, 2011 | 2000 Chevrolet Impala

1 Answer

Low coolant level warning keeps coming up on information station not low on coolant. Where is sensor located or other related problems? Thanks.

You probably do not need a sensor. The coolant when it gets old in this car WILL cause the low coolant light to come on! Boy! I have been there on those vehicles soooo many times working for the dealer. The first one I encountered threw me for a few days before I FINALLY flushed out the cooling system and solved the problem. Somehow the coolant when it gets old it looses its conductivity and the sensor can not sense the coolant level is above its level. This vehicle does not use a FLOAT type sensor. It is a conductivity sensor. Flush the cooling system (unless you already have) and the problem SHOULD be gone. If not then you can change the sensor ok? The sensor is located on the passenger side of the radiator facing the engine about 1/4 the way down from the top. Be careful not to break the plastic retaining fingers that hold it to the radiator. Lube the o-ring that seals the new sensor before installation with some vaseline or silicone paste but try not to get too much into the cooling system itself.
Good Luck! Scott
Please rate my response/solution - Thank you!

Sep 04, 2011 | 1993 Oldsmobile Eighty Eight

1 Answer

Low coolant light stays on. Changed sensor. Still comes on. Tech says oil leaking into coolant contaminating sensor. Says this is a common problem with this car. Is this a head gasket problem, and will...

I had a similar problem. Replaced head gasket, but low coolant light stayed on. My problem was air in the system. A flush and fill kit may work, however, I had a local shop do a "flush and fill" and the problem remained. What I did... With vehicle running, and radiator cap off, bring engine to operating temperature. Increase rpms slightly above idle until coolant can be seen moving in radiator (thermostat open). Add small amounts of coolant, keeping the radiator level just below overflow hole in cap area. In my case, after about 15 minutes at slightly above idle rpms, a large pocket of air escaped. I topped off radiator, installed cap, and let engine cool. Problem has not returned in last six months. *Note coolant is VERY HOT, and if rpms fluctuate, coolant will expel quickly from radiator. Also, when the air pocket escaped, coolant also sprays out. Use caution to avoid being burned.

Feb 01, 2011 | 2002 Buick Century

2 Answers

My low coolant light flashes on and off then it will stay on.I have checked my coolant level it is good what could be the problem? 1999 Buick regal

Make sure you are checking the coolant level in the radiator as well as in the overflow tank. The sensor is located in the radiator, so if the level in the overflow tank is good, it could still be low in the radiator.

Dec 06, 2010 | 1999 Buick Regal

3 Answers

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


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

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


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


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.


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.

Oct 31, 2009 | 2002 Chevrolet Monte Carlo

3 Answers

My low coolant light is flickering on and off. I flushed the system today. No other symptoms. no overheating or leaks. this is on a 1995 Buick Regal Custom V6.

It could be that the low coolant sensor is just dirty. You should be able to follow a wire to the top part of your radiator, to the sensor, or it might be in the overflow tank, take it out and clean it, and see if that will do it, if not, replace it.

May 03, 2009 | 1995 Buick Regal

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