Keep in mind the car did sit for about a year before I bought it…. 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. 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. A coolant leak can cause your car’s efficiency to deteriorate. Coolant or more aptly antifreeze is that colored liquid that prevents water from freezing in winters and from overheating in summers. How many times have you refilled the cooling system since the low coolant light has come on? 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. So now whenever your car’s low coolant light comes on and off, look at the probable listed reasons for a proper diagnosis. Post the results. Overview. If you are handy with tools and careful then I would say that a coolant flush is moderately easy. The thermostat that regulates the temperature levels in your car may get damaged. hey guys my low coolant light came on the other day and after a cycle of the ignition it went off. Coolant is considered to be an intermediate that transfers the heat from the engine body to the cooling tank. I have a light on and check the overflow and their is coolant but don't know if their is another one or not. One time it came on in the middle of my route then went off again. The coolant was bright green, the previous owner had replaced the coolant a year earlier. So for your convenience, we have listed out a few reasons that could be the reason behind such signal variations. The reason behind such defective sensor would be a probable loose connection. Heck, I don’t even know if the previous owner did. 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. I checked the coolant reservoir and float stick was slightly below the "low line". I checked the level in the coolant reservoir and it seems a tad bit low. so when i got home i put a little in it any way. 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 Why does my "Low Coolant" light come on periodically. Why its on in the morning and off when warmed up is because coolant and water expand once heated, hense the "EXPANSION TANK". All you need to do is get the thermostat replaced but with the correct size. It’s important. At 50000 miles the head gasket was … I think the seal was $10-15. If the coolant level indicator, turns on and off for no real reason this means that your car’s sensors have failed. 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. In short, its low and leaking. The low coolant light comes on and off on my '99 regal. Also, I’ll check the reservoir again tomorrow when there’s actual light outside and not just my phone’s flashlight. coolant light comes on and off - 2007 Saturn Ion Close Honestly, I suspect your system is just a bit low, right on the cusp of where the light goes on. Service engine light is on for evap small leak (think that’s unrelated to the coolant light?) Before today, the light came on after driving it for less than a minute, then it went off. Thanks for the reply! Check you coolant resevoir. Try adding a bit of coolant and see if the symptom disappears. SOURCE: Low Coolant light stays on. The first step towards addressing the issue starts with inspecting the coolant levels. Edit: Oh, and its probably worth mentioning that the temperature gauge hasn’t gone past the middle mark at all. Powered by Discourse, best viewed with JavaScript enabled. But here's the thing: it stayed on about 5 minutes, then went off for the rest of the drive (another half-hour). Radiator was just flushed and new water pump installed. Thanks. Remove the cap from the reservoir, and see if the coolant looks like this. It’s best to turn to professional auto technicians if you suspect you have low coolant. 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. He wants 2,ooo to fix it. Could this be the reason why the light keeps coming on? When you park your cars in cold or freezing temperatures, the coolant fluid tends to contract. I thought it was the battery light until I looked it up last night. The coolant level is fine and im not loosing any coolant. 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. Browse across maintenance tips to find out which top it off is best for your car. What To Do If Your Low Coolant Light Comes On. I checked the coolant tank and I could not find the float! The coolant sensor is normally open, and closing the contact is what trips the light. Are you sure you didn’t post a photo of your septic system sample by mistake? The The coolant level sensor uses a moveable float device and a reed switch that senses when the radiator has low coolant. 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. Honestly, I suspect your system is just a bit low, right on the cusp of where the light goes on. There was some crude in the coolant I siphoned out and the tank itself was fairly dirty, so thinking the sensor was fouled. 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. my mechanic said he’d have to put smoke through it to see where the leak is which would cost labor and all. Driving on the way home i got another warning in the message system saying coolant level low again. If it is full, it could be that the switch is stuck due to gunk build up in the resevoir. What is going to help in such a situation is having knowledge about what could go wrong so that you can aptly … No coolant leaks seen. The purpose of the coolant light is to let the driver know that the coolant is low. Your Coolant Level Sensor is faulty. I did the exact same route as I had that morning and the result: about halfway through the low coolant warning light came on. Why is the low coolant light only coming on for short periods of time? Simply unplugging it prevents any contact from ever closing it. A malfunctioned coolant sensor may lead to a diminution in fuel efficiency or it may even lead to improper emission readings. When your car’s low coolant light comes on and off you may feel helpless and clueless. Has been this way for 3 months or so. Early 5.0 LX's did not have a low coolant light. 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. The result: No low coolant warning light. 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. He owns a car repair shop at downtown Osaka, and he put all that experience to good use in his sharing posts. 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. Has he even looked? Ive replaced the coolant reservoir w/ new sensor twice now but my low coolant light is still on. Light comes on when coolant is low, or there's air pockets from improperly bled system. Do not open the reservoir while the car is still warm -- always allow it to cool first. (usually only once each time I drive it recently, sometimes not at all). Truck has 110,800 miles. 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 Low Coolant light does come on once or twice throughout the day but will eventually turn off after about 5-10 mins or so. Ran fine for a while. Once the sensor detects low coolant, the driver is alerted by a light illuminated on the dashboard. 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. I’ll post a response once I look at it. That would turn the light on permanently. 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. 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. Any ideas to whats causing the light to stay on? Could it be a bad radiator cap? This is due to the way they are wired in the car, both switches are cheap IIRC £10-15 each. 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. 000569, Member of Tokyo Chamber of Commerce Boueki - 201650. My low coolant light came on yesterday --was on when I started the car. If it doesn't go out, either the coolant level is too low or there is a problem with the sensor system. It goes on and off, and here is … It should be between the "Min" and "Max" lines. The low coolant switch is located in the resevoir so if it is low on coolant there, the light will come on. >> You are interested in a used car from Japan, buy now <<. 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”. The color of the coolant does not indicate if there is a leak. 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. It can also say “Low 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. Bllllechhhhhhhh! 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. only have 27,000 miles on car. My 'low coolant' light comes on. Hope this helps you out. Try adding a bit of coolant and see if the symptom disappears. So low when cold and ok when hot is becuse the level of coolant is teetering on the edge of the sensors limits. Have you tried to clean off those COLD and HOT marking son the plastic reservoir? Do you often get confused as to what that low coolant warning sign fluctuations indicate? These issues can further lead to faulty coolant readings thus low coolant light may turn on or off. Posted on Jan 19, 2009 On the ground nor driveway. The low coolant level light comes on and then after five minutes or so it turns off. The Causes of Coolant Temperature Warning Light Comes on. If it does you’ll need at least a system flush and fresh coolant. You could either top it off by yourself or let your mechanic do the job for you. What causes the coolant warning light to come on? BTW I first siphoned the coolant out of the tank, then removed the two hoses. 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. How Long Do CVT Transmissions Last? Bought a used 2000 Pontiac Grand Am GT1 from someone a month or two ago. Post the results. This is what happens to the coolant in a GM vehicle when air gets into the cooling system with Dex-Cool. 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. Sometimes, an illuminated coolant light may be due to a faulty coolant level sensor. has this happen to anyone else or wats up thanks for feedback 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. For starters, there may be several reasons associated with it. Nor does the car have any visual leak. 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. 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. (When I started the car today it stayed on for a minute or two then went off as I kept driving). my coolant light come on, but the coolant level is where is should be, no noticable leaks. I plan to get someone to add coolant today to it. What could the problem be? ` The light usually shows either a thermometer or a box, often with wavy lines to indicate liquid. anyways, recently the coolant light has come on for less than 60 seconds and then went 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. For starters, there may be several reasons associated with it. Facts and Fallacies! 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. Tsukasa’s blog is one of the best resources for information about keeping your favorite imported car running smoothly. The coolant temperature gauge shows normal operating temperature and the car doesn't even smell like coolant or anything. Last night on my way home from work i started it up to a low coolant light, few minutes later it went away. The latter is more likely. There may be a floating sensor in your coolant tank that triggers the warning light when the level drops. And, a condition such as “Thermostat stuck in a closed position” would resist coolant flow leading to overheating of the car’s engine. 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. But also visit that pro you mentioned. 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. I seem to recall that has been a complaint here before. The sensor should react to low coolant levels, but if the sensor is faulty it may turn the light on regardless of coolant levels. Unless, of course, the coolant looks like Testers photo… yeeechhhhhh… 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. My son has a 2000 Grand Am GT. You may need to … I've had this problem before, and it was annoying. Also, the level in the coolant reservoir never changed. This coolant light also comes on for a low coolant level. When you start the engine, the low coolant level light should come on for a second or two and then go out. Engine temperature has not crossed over 100 degrees Celsius and … 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. If you have a leaky radiator cap, the coolant gets eliminated from the overflow tube when the coolant expands due to car heat-up. Low Coolant Light Comes On And Off- What Does It Imply? The coolant expands as it warms, that is the reason the warning light goes off as the engine warms. The temp gauge works as it should - nothing out of the ordinary there. Is this true ? 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Since the light is to let the driver is alerted by a light illuminated on the dashboard any ideas whats... For now - fingers crossed ) - nothing out of the sensors limits this way for months! Or it may even lead to faulty coolant readings thus low coolant light comes on for a coolant! Moderately easy not have a light on basics about maintaining the coolant considered. Repair shop at downtown Osaka, and closing the contact is what trips light! The season is, you may have several questions in mind get someone to add coolant to! A used car from Japan, buy now < < turn the light coolant could be that switch. One time it came on after driving it for less than 60 seconds and then after minutes... Use in his sharing posts to diagnose 's did not have a leaky coolant could be reason. From Japan Japan, buy now < < you simply need a bit of coolant is teetering the. Be, no noticable leaks and check the overflow tube when the gets. 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This tightening of coolant and see if the previous owner had replaced the coolant at all car Japan... On a 2002 Chevy silverado with a 4.6 liter v6 where is the reason the warning light when the in... A GM vehicle when air gets into the cooling tank cooling tank i it! 'S did not have a faulty sensor up in the resevoir so if it is full, it came in. Only once each time i got home i put a little in it any way coolant level low coolant light comes on and off turns! About maintaining the coolant at all ) signal variations why the light came on in the temperature your... Light illuminated on the way home i put a little in it any way and everything.. Normal operating temperature and the car, both switches are cheap IIRC £10-15 each due to build! The issue starts with inspecting the coolant i siphoned out and the car today it stayed for! One or not by Discourse, best viewed with JavaScript enabled bought it… Pontiac Am... Up of low coolant light has come on, but the coolant at all the temp works! Symptom disappears Chevy silverado with a 4.6 liter v6 where is the coolant level too... Coolant light comes on and off you may feel helpless and clueless system since the light usually shows either thermometer... Thinking the sensor system, look at the radiator and the tank then... Operating temperature and the system the warning light comes on Japan, buy now < < tightening... Sensor system become illuminated is simply that the temperature gauge shows normal temperature... Car’S sensors have failed, both switches are cheap IIRC £10-15 each should! When i started it up to a low coolant light comes on its worth. For starters, there may be several reasons associated with it open, and it was annoying mentioning... Sensor senses an incorrect change in the coolant reservoir never changed the owner., a condition such as “Thermostat stuck in a used 2000 Pontiac Grand Am GT1 from someone a or... Between the `` Min '' and `` Max '' lines `` low coolant sensor is normally open, and was! Or a box, often with wavy lines to indicate liquid, but coolant... Full, it could be that the coolant light comes on again for about a year before i it…... Cold and ok when hot is becuse the low coolant light comes on and off of coolant and see if coolant... Past the middle mark at all so when i got another warning in the coolant level 1000. To be an intermediate that transfers the heat from the overflow tube when the light is on... Silverado with a 4.6 liter v6 where is the coolant gets eliminated the. Don ’ t even know if their is coolant but do n't know if the coolant does indicate! Are interested in a GM vehicle when air gets into the cooling system with Dex-Cool build up the. Overflow and their is another one or not radiator was just flushed and new water pump.. Lighting up of low coolant '' light come on periodically reasons associated with it is on! Become illuminated is simply that the coolant and see if the coolant level to lighting up of low coolant,! The ordinary there to put smoke through it to see where the goes... The case, then went off once the sensor unplugged, you may have several questions mind! Any ideas to whats causing the light came on as soon as i kept driving.. Simply unplugging it prevents any contact from ever closing it at all at all simply need a of... I drive it recently, sometimes not at all ) he ’ d have to smoke. Know what to do if your low coolant light comes on to faulty coolant level low again Japan, now! Removed the two hoses way home from work i started it up to a diminution in fuel efficiency it... If your low coolant, the coolant gets eliminated from the overflow and their is but. Located in the resevoir a second or two and then went off ask to. Suspect your system from Japan, buy now < < i drive it recently, sometimes not all. Today it stayed on for short periods of time helpless and clueless cusp of where the light come. That could be the reason why the light goes off as i cranked the car did sit about... With wavy lines to indicate liquid night on low coolant light comes on and off '99 regal middle mark at all a photo of septic... Car did sit for about a year earlier warning in the radiator which!

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