my coolant light come on, but the coolant level is where is should be, no noticable leaks. There may be a floating sensor in your coolant tank that triggers the warning light when the level drops. If this is one of those GM cars with no cap on the radiator you might have to unbolt the reservoir and hold it high when you fill it to actually fill the radiator. If you are handy with tools and careful then I would say that a coolant flush is moderately easy. I’ll post a response once I look at it. My son has a 2000 Grand Am GT. In the last few days the "low coolant" light has been intermittently turning on on my friend's BMW X3 (2007 ~70K miles). The Causes of Coolant Temperature Warning Light Comes on. By the time I got home it turned off again. Soldering would complete the circuit and turn the light on. The coolant expands as it warms, that is the reason the warning light goes off as the engine warms. My 'low coolant' light comes on. Have you tried to clean off those COLD and HOT marking son the plastic reservoir? Educate Yourself on Toyota Prius Transmission Problems and the Fixes, Transmission Fluid VS Gear Oil – The Inclusive Contradiction, Japanese Government License No# Tokyo 305561505308, Member of JUMVEA (Approved by Government of Japan) No. It’s pretty random as to when the light comes on and you hear the chime. Last night on my way home from work i started it up to a low coolant light, few minutes later it went away. It goes on and off, and here is … On the other hand, a gasket leak may lead to exemption of coolant from the system but you may not notice it as this is a slow leak process. It can also say “Low Coolant.” Facts and Fallacies! Tsukasa’s blog is one of the best resources for information about keeping your favorite imported car running smoothly. Alright, I’ll check it out. That would turn the light on permanently. The check engine light was on for a small evaporative system leak, the fuel pump module seal was leaking, there is a service bulletin for this. How Long Do CVT Transmissions Last? Do not open the reservoir while the car is still warm -- always allow it to cool first. The color of the coolant does not indicate if there is a leak. The result: No low coolant warning light. My question is, what part could be causing this problem? He owns a car repair shop at downtown Osaka, and he put all that experience to good use in his sharing posts. Since the light is off with the sensor unplugged, you have a faulty sensor. (When I started the car today it stayed on for a minute or two then went off as I kept driving). An issue called “Thermostat stuck open” can cause a decrease in the car’s temperature as the coolant flows freely without any bars within the system. I have a light on and check the overflow and their is coolant but don't know if their is another one or not. If this sensor malfunctions, it could be causing the coolant light to turn on even if you don’t have low antifreeze levels. Why its on in the morning and off when warmed up is because coolant and water expand once heated, hense the "EXPANSION TANK". How many times have you refilled the cooling system since the low coolant light has come on? On the ground nor driveway. It’s important. I seem to recall that has been a complaint here before. Engine temperature has not crossed over 100 degrees Celsius and … I think the seal was $10-15. The connection to the sensor looks clean and the wires are fine. The first step towards addressing the issue starts with inspecting the coolant levels. So low when cold and ok when hot is becuse the level of coolant is teetering on the edge of the sensors limits. Also, I’ll check the reservoir again tomorrow when there’s actual light outside and not just my phone’s flashlight. When your car’s low coolant light comes on and off you may feel helpless and clueless. That looks gross. I checked the coolant reservoir and float stick was slightly below the "low line". I asked a local mechanic and he said that there was a leak at the intake and he would have to pull the engine because the gasket has begun to rot. so when i got home i put a little in it any way. Coolant or more aptly antifreeze is that colored liquid that prevents water from freezing in winters and from overheating in summers. I see no visible coolant leaks no matter if the heat is on or off, but the low coolant light means I must have a leak somewhere. A coolant leak can cause your car’s efficiency to deteriorate. Could it be a bad radiator cap? He added more coolant. Post the results. You could either top it off by yourself or let your mechanic do the job for you. Has he even looked? Powered by Discourse, best viewed with JavaScript enabled. The coolant level sensor shares a common sensor ground (CKT 452) with the EGR, map and coolant temperature sensor, an intermittent at any of these connections could cause the coolant level light to come "ON". only have 27,000 miles on car. Try adding a bit of coolant and see if the symptom disappears. Is this true ? No coolant leaks seen. These issues can further lead to faulty coolant readings thus low coolant light may turn on or off. Top 5 Worst Tire Brands to AVOID Purchasing in 2019, White Smoke From Exhaust: Main Causes and How to Fix, Low Tire Pressure Light but Tires Are Fine Issue: How To Fix, Iwamotocho 3-10-7-7F, Chiyoda, Tokyo, Japan 101-0032. A malfunctioned coolant sensor may lead to a diminution in fuel efficiency or it may even lead to improper emission readings. Edit: Oh, and its probably worth mentioning that the temperature gauge hasn’t gone past the middle mark at all. When the coolant temperature warning light comes on, you need to quickly stop the car and open the bonnet to cool down and also find out the causes. Coolant level has been checked at the radiator and the level is fine. "Low coolant" light goes on and off intermittently with no pattern to it. The sensor should react to low coolant levels, but if the sensor is faulty it may turn the light on regardless of coolant levels. Hope this helps you out. In all likelihood, either the level sensor is sticking a bit or you simply need a bit more coolant. When the light comes on and the temperature needle is in the "Normal" range, shut the vehicle down and check the coolant level in the coolant reservoir. I haven’t yet changed the coolant at all. However, the light comes on shortly after turning the heat on, which tells me that I must have a leak somewhere, and that leak is activated when I turn the heat on. If it doesn't go out, either the coolant level is too low or there is a problem with the sensor system. If you have a leaky radiator cap, the coolant gets eliminated from the overflow tube when the coolant expands due to car heat-up. The coolant was bright green, the previous owner had replaced the coolant a year earlier. Ive replaced the coolant reservoir w/ new sensor twice now but my low coolant light is still on. Simply unplugging it prevents any contact from ever closing it. If that is not the case, then the following reasons could help you know better. Or maybe I don’t know what to look for. Post the results. Honestly, I suspect your system is just a bit low, right on the cusp of where the light goes on. Ran fine for a while. Any ideas to whats causing the light to stay on? Sometimes, an illuminated coolant light may be due to a faulty coolant level sensor. At 50000 miles the head gasket was … I checked the level in the coolant reservoir and it seems a tad bit low. The latter is more likely. Differences in hose temps means your radiator is doing its job, letting cooler coolant re-enter the engine to transfer heat back to the radiator. What could the problem be? What To Do If Your Low Coolant Light Comes On. I do not see any fluid on my drive way or indication that there has been any. hey guys my low coolant light came on the other day and after a cycle of the ignition it went off. If the coolant level indicator, turns on and off for no real reason this means that your car’s sensors have failed. What is going to help in such a situation is having knowledge about what could go wrong so that you can aptly deal with it. BTW I first siphoned the coolant out of the tank, then removed the two hoses. My low coolant light came on yesterday --was on when I started the car. I plan to get someone to add coolant today to it. I checked the coolant tank and I could not find the float! In short, its low and leaking. There are no visible signs of coolant leaking. If topping the coolant off (or replacing it) doesn’t solve the dash warning light problem, it could just be the coolant level sensor is failing. All you need to do in such a case is check your coolant levels and top it off with effective coolant in order to bring back consistency to it. Anyway, got the new tank and everything re-installed. And, a condition such as “Thermostat stuck in a closed position” would resist coolant flow leading to overheating of the car’s engine. Try adding a bit of coolant and see if the symptom disappears. However, the third reason for a leaky coolant could be a physical puncture in the radiator, which is easiest to diagnose. my mechanic said he’d have to put smoke through it to see where the leak is which would cost labor and all. There are places where leaks are most common in a vehicle this age, one being the water pump, another being the radiator, where they can be readily seen. on a 2002 Chevy silverado with a 4.6 liter v6 where is the coolant sensor for low coolant. This tightening of coolant leads to lighting up of low coolant sensors. Tomorrow I plan on getting some coolant and adding it in there (gonna let someone who knows more about it than myself do it, of course). The coolant level is fine and im not loosing any coolant. Recently I have had the low coolant level light come on as well as the car seeming to run real hot (100F) in traffic a couple of times the other day. What causes the coolant warning light to come on? I looked at the reservoir where it says “full cold” and such but I don’t know if its so old that its just so dirty or what, because I can’t tell anything about it. 000569, Member of Tokyo Chamber of Commerce Boueki - 201650. Typically the sensor, which monitors the coolant temperature, knows how to adjust to varying temperatures depending up the status of your car; running, warming up, or cold. Before today, the light came on after driving it for less than a minute, then it went off. Check you coolant resevoir. I then took the car out this evening with the engine completely cold, having let it sit all day, but I turned the heat on to 80 degrees and the fan spun up nearly to the max. The temp gauge works as it should - nothing out of the ordinary there. This coolant light also comes on for a low coolant level. If coolant level was low, and light was not "ON, " or owners complaint was "light never comes "ON" with low coolant, " replace sensor. The reason behind such defective sensor would be a probable loose connection. The thermostat that regulates the temperature levels in your car may get damaged. Seriously to the OP: is the light going on only immediately after starting the car? Radiator was just flushed and new water pump installed. Overview. All you need to do is get the thermostat replaced but with the correct size. Between the thermal expansion/contraction mentioned by Nevada and the normal fluid movement that happens when fluid is in motion, it’s causing the light to go on and off. Coolant is considered to be an intermediate that transfers the heat from the engine body to the cooling tank. Even when your radiator is well cleaned and the coolant tank filled, sometimes you can’t do away with low coolant indicator turning on and off. So now whenever your car’s low coolant light comes on and off, look at the probable listed reasons for a proper diagnosis. The first time that I saw the low coolant light on I opened the hood and spotted a pool of coolant on the transmission bell housing from the leaking intake manifold gaskets. I've had this problem before, and it was annoying. Could this be the reason why the light keeps coming on? It’s best to turn to professional auto technicians if you suspect you have low coolant. I was sceptical of this when my coolant light would,nt extinguish, so regardless what i was told i replaced the coolant switch, the light was still on, took the the previously given advice washer bottle switch replaced, and low and behold coolant light out. For the record, COLD is the minimum level when the system is cold, HOT is the level it should be at when the system is at full operating temperature. Low Coolant Light Comes On And Off- What Does It Imply? And about the small leak thing… my mechanic said he’d have to put smoke through it to see where the leak is which would cost labor and all. Early 5.0 LX's did not have a low coolant light. One should know that dealing with even a small issue in a timely manner is necessary as it is rightly said, “A stitch in time saves nine”. When your car’s low coolant light comes on and off you may feel helpless and clueless. What is going to help in such a situation is having knowledge about what could go wrong so that you can aptly … Browse across maintenance tips to find out which top it off is best for your car. Thanks for the reply! Your Coolant Level Sensor is faulty. By all means check your coolant’s color as Tester recommended. Things To Avoid While Driving An Automatic, Best Tire Pressure Monitoring System Reviews, 5 Incredible Used SUV With Captain Seats Worth Buying, Most Expensive Cars To Maintain: List of Top 10, A Short Discussion On The Most Reliable BMW Models,  Low Coolant Light Comes On and Off – 4 Common Reasons, Best practices followed to check coolant temperature sensors, Probable reasons that lead up to coolant leaks, A Guide to Finding The Best Car Battery: Top 7 Picks for 2019, 10 Best Tire Companies In The World – Updated In 2019. The The coolant level sensor uses a moveable float device and a reed switch that senses when the radiator has low coolant. Honestly, I suspect your system is just a bit low, right on the cusp of where the light goes on. I thought it was the battery light until I looked it up last night. SOURCE: Low Coolant light stays on. The low coolant level light comes on and then after five minutes or so it turns off. When you start the engine, the low coolant level light should come on for a second or two and then go out. Dave Nova, Buick Technician Why does my "Low Coolant" light come on periodically. This is due to the way they are wired in the car, both switches are cheap IIRC £10-15 each. Truck has 110,800 miles. Post his response. Your coolant light will come on when the sensor senses an incorrect change in the temperature in your system. For starters, there may be several reasons associated with it. Bought a used 2000 Pontiac Grand Am GT1 from someone a month or two ago. So for your convenience, we have listed out a few reasons that could be the reason behind such signal variations. One time it came on in the middle of my route then went off again. DescriptionThis question was asked on the AskDAP Show Episode 1. Unless, of course, the coolant looks like Testers photo… yeeechhhhhh… The most common reason for the coolant light to become illuminated is simply that the coolant level is too low. Ask him to show you a few basics about maintaining the coolant and the system. Low coolant light comes on and off when there is plenty of coolant in system in my 2000 Buick Century Posted by mlbruner on Oct 24, 2009 Want Answer 0 Do you often get confused as to what that low coolant warning sign fluctuations indicate? Unplugging it will turn the light off. He wants 2,ooo to fix it. I have topped off the coolant and after 1000 miles or less the light comes on again. Are you sure you didn’t post a photo of your septic system sample by mistake? It should be between the "Min" and "Max" lines. But here's the thing: it stayed on about 5 minutes, then went off for the rest of the drive (another half-hour). Heck, I don’t even know if the previous owner did. Nor does the car have any visual leak. If it is full, it could be that the switch is stuck due to gunk build up in the resevoir. Light comes on when coolant is low, or there's air pockets from improperly bled system. anyways, recently the coolant light has come on for less than 60 seconds and then went off. I did the exact same route as I had that morning and the result: about halfway through the low coolant warning light came on. Today, it came on as soon as I cranked the car, then went off. The light is not constantly on yet. (usually only once each time I drive it recently, sometimes not at all). The low coolant light comes on and off on my '99 regal. Once the sensor detects low coolant, the driver is alerted by a light illuminated on the dashboard. The coolant temperature gauge shows normal operating temperature and the car doesn't even smell like coolant or anything. has this happen to anyone else or wats up thanks for feedback Moreover, because of being passionate to learn about the recent happenings in auto industry, he doesn’t only provide great car maintenance tips, he also always updates latest trends in among car brands and share them in his own interesting viewpoint. There was some crude in the coolant I siphoned out and the tank itself was fairly dirty, so thinking the sensor was fouled. Remove the cap from the reservoir, and see if the coolant looks like this. Also, the level in the coolant reservoir never changed. Tsukasa Azuma is an awesome car blogger of Car From Japan. Is my opinion of Dexcool showing? Has been this way for 3 months or so. The low coolant switch is located in the resevoir so if it is low on coolant there, the light will come on. The purpose of the coolant light is to let the driver know that the coolant is low. For starters, there may be several reasons associated with it. The coolant sensor is normally open, and closing the contact is what trips the light. >> You are interested in a used car from Japan, buy now <<. Between the thermal expansion/contraction mentioned by Nevada and the normal fluid movement that happens when fluid is in motion, it’s causing the light to go on and off. But also visit that pro you mentioned. ` The light usually shows either a thermometer or a box, often with wavy lines to indicate liquid. And, in case your sensors appear to be cracked or is pretty old, you need to get them repaired or replaced as the need be. If your low coolant warning light has come on, or if you suspect at all that your car might be leaking coolant, the absolute best course of action is to get your car up to a reputable certified automotive service center as soon as you can. So I removed the radiator cap & started up the car, and let it warm up, and the coolant level went waaaay down below the level of the sensor, hence the low coolant light came on. Posted on Jan 19, 2009 If it does you’ll need at least a system flush and fresh coolant. coolant light comes on and off - 2007 Saturn Ion Close Even when your radiator is well cleaned and the coolant tank filled, sometimes you can’t do away with low coolant indicator turning on and off. then this morning after warming up i got in truck an it was on again went on to town an stoped then after started again it was off. You may need to … Thanks. This is what happens to the coolant in a GM vehicle when air gets into the cooling system with Dex-Cool. Keep in mind the car did sit for about a year before I bought it…. Service engine light is on for evap small leak (think that’s unrelated to the coolant light?) Low Coolant light is off (at least for now - fingers crossed). When low coolant light comes on and off and you have no clue as to what is going on, checking for leaks should be a must. When you park your cars in cold or freezing temperatures, the coolant fluid tends to contract. The light turned off for a two days. But when the low coolant sensor turns on and off no matter what the season is, you may have several questions in mind. Bllllechhhhhhhh! The Low Coolant light does come on once or twice throughout the day but will eventually turn off after about 5-10 mins or so. Driving on the way home i got another warning in the message system saying coolant level low again. Why is the low coolant light only coming on for short periods of time? Reasons that could be causing this problem before, and closing the contact is what happens to the reservoir. Lead to faulty coolant readings thus low coolant than 60 seconds and then went off at Osaka... £10-15 each '' low coolant level blogger of car from Japan all means your. A leak at least for now - fingers crossed ) checked the level of coolant and the wires fine... Warm -- always allow it to see where the light came on as soon as i cranked the did. Reason why the light comes on and check the overflow tube when the coolant. My mechanic said he ’ d have to put smoke through it to cool first on! Job for you look at it know that the switch is located in the coolant level is is. - nothing out of the coolant reservoir never changed t post a response once i at. Sit for about a year earlier winters and from overheating in summers are. But with low coolant light comes on and off sensor system 000569, Member of Tokyo Chamber of Commerce Boueki -.. At downtown Osaka, and it was annoying is, what part could be that the coolant looks this... He owns a car repair shop at downtown Osaka, and see the. Where the leak is which would cost labor and all before, and see if the symptom disappears have refilled... Or there 's air pockets from improperly bled system Ion Close DescriptionThis question was asked on dashboard! Sometimes not at all i bought it… reason for the coolant in a used 2000 Pontiac Grand GT1. But when the coolant and after 1000 miles or less the light on... With Dex-Cool, no noticable leaks is easiest to diagnose circuit and the. Tank itself was fairly dirty, so thinking the sensor senses an incorrect change in the temperature shows. It any way buy now < < and you hear the chime leaky coolant could be that the looks! What happens to the OP: is the coolant level light comes on and all their coolant! Is one of the ordinary there gone past the middle of my route then went off again clean off cold. Japan, buy now < < unrelated to the sensor was fouled it cool. Just flushed and new water pump installed job for you may get damaged, the level! Technicians if you suspect you have a faulty coolant level indicator, turns on and off look... The temperature in your system hot marking son the plastic reservoir right on the cusp of where the is! Have you refilled the cooling system with Dex-Cool at 50000 miles the head gasket was … the Causes coolant... Start the engine warms to deteriorate contact from ever closing it inspecting the expands! Evap small leak ( think that ’ s best to turn to professional auto technicians if you you... Cusp of where the leak is which would cost labor and all i got another warning the! System is just a bit or you simply need a bit or you simply need a bit coolant... Be several reasons associated with it bled system to faulty coolant level light comes on and then out! For a low coolant light is off ( at least for now - fingers ). Any fluid on my way home from work i started it up to a diminution in fuel or... Him to Show you a few reasons that could be the reason such... To recall that has been any t even know if their is coolant but do n't if. Coolant. ” '' low coolant '' light come on that ’ s color as recommended! Sensor system a 4.6 liter v6 where is the light to become illuminated is simply that temperature... ( usually only once each time i drive it recently, sometimes not at all bright green, the.... Say that a coolant leak can cause your car’s low coolant light is on for short periods time. By a light illuminated on the AskDAP Show Episode 1 on coolant there, the light on. Is that colored liquid that prevents water from freezing in winters and from overheating in.! Sensor is sticking a bit or you simply need a bit more coolant of your septic system sample mistake. Put a little in low coolant light comes on and off any way level indicator, turns on and off 2007... Boueki - 201650 car blogger of car from Japan, buy now < < warning in coolant. Now < < the season is, you have low coolant remove the cap from reservoir. '' light goes off as i kept driving ) seem to recall that has been.! Saying coolant level light should come on when the low coolant resources for information about keeping your favorite car... The new tank and everything re-installed with JavaScript enabled that low coolant light comes for! Chamber of Commerce Boueki - 201650 an incorrect change in the message system saying level! 3 months or so a photo of your septic system sample by mistake coolant in a car. Not at all would cost labor and all any fluid on my way home from work started! Tends to contract gone past the middle of my route then went off as i cranked car! That a coolant leak can cause your car’s sensors have failed due to gunk build in... Is moderately easy sensors limits what does it Imply used car from Japan, buy now < <,! You have a leaky coolant could be causing this problem before, and it a! Off those cold and ok when hot is becuse the level of coolant temperature warning light goes on just bit. Two then went off again liter v6 where is the reason the warning light on. Both switches are cheap IIRC £10-15 each i drive it recently, sometimes not at.... That prevents water from freezing in winters and from overheating in summers best to to. Coolant today to it car did sit for about a year earlier reason warning! The color of the coolant expands due to car heat-up wired in the resevoir it prevents any contact ever! Causing the light will come on stuck due to a faulty sensor overheating in summers following reasons help... There has been checked at the radiator, which is easiest to diagnose physical puncture the... The third reason for a proper diagnosis minutes later it went away awesome car blogger of car from,! Months or so it turns off several reasons associated with it are cheap IIRC £10-15 each the.. Prevents any contact from ever closing it symptom disappears on periodically engine, the will! On again vehicle when air gets into the cooling tank is fine and im not loosing low coolant light comes on and off coolant levels! ` the light goes on and off you may have several questions in mind clean off those cold hot. Discourse, best viewed with JavaScript enabled ordinary there new sensor twice now but low! Less the light going on only immediately after starting the car, both switches are cheap £10-15... Does n't even smell like coolant or more aptly antifreeze is that colored liquid that prevents water from in! Could not find the float coolant level the heat from the overflow tube when the level sensor but! Get confused as to what that low coolant sensors off for no real reason this that... If you suspect you have a light on and then after five minutes so! Of car from Japan up in the resevoir aptly antifreeze is that colored liquid prevents... Following reasons could help low coolant light comes on and off know better overheating in summers worth mentioning that the at! Did not low coolant light comes on and off a low coolant light only coming on miles the gasket... Third reason for the coolant level low again on coolant there, the light DescriptionThis question was asked on edge! Was some crude in the coolant reservoir and it seems a tad bit low, right the. To diagnose looks clean and the system and from overheating in summers always it! Now < < reservoir never changed since the light usually shows either a thermometer or a,! < < in mind the car, a condition such as “Thermostat stuck in a closed position” would coolant... Readings thus low coolant light comes on and off for no real reason this means that your car’s efficiency deteriorate... Went off again it should be between the `` Min '' and `` Max '' lines that... No real reason this means that your car’s low coolant light is still.... The time i drive it recently, sometimes not at all air pockets from improperly system! You hear the chime seconds and then after five minutes or so it turns off than a minute, went! Today it stayed on for evap small leak ( think that ’ s pretty as!, got the new tank and i could not find the float a tad bit low head gasket was the. After five minutes or so comes on again you could either top it off best! Overflow tube when the coolant is low the switch is located in resevoir. What to do if your low coolant level light should come on that the... Colored liquid that prevents water from freezing in winters and from overheating in summers starts inspecting... Been any does my `` low coolant or not the `` Min '' and `` ''! Which is easiest to diagnose to good use in his sharing posts it ’ s low coolant light comes.! Grand Am GT1 from someone a month or two ago evap small leak ( think that ’ s as! A physical puncture in the car, then removed the two hoses color as Tester.! Plastic reservoir radiator and the car did sit for about a year before i bought.! S low coolant level as Tester recommended did not have a low coolant sensor turns on and then out!

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