How do I reset the low coolant light

Major, major PITA. They work by using the coolant to conduct a very small current between the little pickup inside the radiator. If the coolant (anti-freeze) gets old and contaminated it puts a coating on the probe ... thus blocking the signal for the coolant level' You can pull the probe out (a job not for the meek) and clean it or you can just live with it because even putting fresh coolant may not make the alarm go away

fill it up first ..bleed air out..if its still on replace the sending unit.

Kelly ... The sensor is nothing more then a piece of wire (anode) and is probably still good. If you get some Brasso it will polish up like brand new. To get that sucker out I was forced to remove the battery for access ... then they have this spring retainer that requires a minimum of 3 hands to remove while doing tricks with your wrist that a magician would envy. Getting it back in requires real dexterity ... the rectangle assembly is a press fit and an "O" ring (actually a rectangle ring) is compressed while your other hand (holding that square spring retainer) must manover under the hand retaining the assembly. I launched the spring twice before getting it secured ( probably because I'm old ). Beware that it is very secure because if it's not completely flat ... as soon as your radiator builds up any pressure it will become a projectile and shoot itself against the battery. I have assembled transmissions in almost total darkness but that little POS requires the dexterity of Houdini based on the visibility and the tiny space it's in. BTW you can't unplug it to eliminate the alarm ... reason being if you unplug it then there is no conductivity through the coolant and it thinks you have "low coolant" You can however put a 2000 Ohm resistor across the plug so it thinks it's reading coolant

Interesting ,,, I unplugged the sensor on a 2002 Grand Prix and it stayed on until the resistor

Ok. So, I went right outside and unplugged the sensor(the second one BTW) and the light is off. That's it! Problem fixed. Enough of this; oil in the coolant, corroded sensor, worn out this and that, Dexcool (which is the best theory), crossing a 2000 ohm resistor over the contacts. Just unplug it and tape both the sensor receptacle and the pigtail well and check your coolant every month and look for leaks under the vehicle. Problem solved. We lived without these FREDs (freaking ridiculous electronic devices) before and we can now. Some of these are non essential and low coolant is one of them.

Got a new (Low coolant) sensor from E-Bay for $7.95 free shipping, work great no more light , happy wife, 2000 Buick Century !

My low coolant light is on 2000 Buick Regal what do I need to do and my low tire cuz I just put 4 brand new tires on it and the light still on is it a sensor need to be reset

low tire is a reset button on the passenger side fuse panel. low coolant much bigger issue.

My layperson input is: I had the low coolant ligjt on for 10 minutes after I starting the car. I thought the low coolant sensor eas defective- bought obe original GM at dealer and haf it replaced at PepBoys. The low coolant ligjts kept coming after starting the car, but for only 3 minutes. I thoughtthe problem could be in the panel or in the Electronic Control Unit ot motherboard; however after having the oil changed and noticed the “replace engine oil” turning on for a couple minutes a few days after the engine oil had been changed, I took the-car back to Pep Boys who reset the engine oil light by turning on the key without starting the engine and pressing the gas pedal ( not the break)3 times in arow, turning the key off and starting the engine. Someone might say the oil light has nothing to do with the low coolant light, but after the oil light was reset, the low coolant light was fixed too. So, There must be a connection between them or a malfunction in the receiving end of the ECU mixing up the messages... so, I do not know if teacing the low coolant sensor was really necessary... Because I just drive the buick tegal 2002 2 days a week, the coolant system may develop bubbles, this, sending a wrong low coolant signal to the ECU. I could have tried to have the coolant replaced with the bleeding procedure to get rid of bubbles... Yes, too many questions, very few answets, but my problems seem to have been resolved... hope it helps. Please let me know what your thoughts are. Thank you

Hi, just updating: resetting the change oil soon light DID NOT RESET THE LOW COOLANT LIGHT. I will try to have the coolant service, including the bleeding to see if it can silve the issue...

No answer told by service center losing coolant that pipes were bad, replaced and still losing coolant and you have bad sensor, so I was in time delay and had my son put in new one. Still donty work