I checked the level in the coolant reservoir and it seems a tad bit low. Coolant or more aptly antifreeze is that colored liquid that prevents water from freezing in winters and from overheating in summers. The Causes of Coolant Temperature Warning Light Comes on. There are no visible signs of coolant leaking. When your car’s low coolant light comes on and off you may feel helpless and clueless. What To Do If Your Low Coolant Light Comes On. Also, the level in the coolant reservoir never changed. Hope this helps you out. For starters, there may be several reasons associated with it. If this sensor malfunctions, it could be causing the coolant light to turn on even if you don’t have low antifreeze levels. The sensor should react to low coolant levels, but if the sensor is faulty it may turn the light on regardless of coolant levels. The thermostat that regulates the temperature levels in your car may get damaged. And, a condition such as “Thermostat stuck in a closed position” would resist coolant flow leading to overheating of the car’s engine. I did the exact same route as I had that morning and the result: about halfway through the low coolant warning light came on. 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. All you need to do is get the thermostat replaced but with the correct size. Simply unplugging it prevents any contact from ever closing it. Why its on in the morning and off when warmed up is because coolant and water expand once heated, hense the "EXPANSION TANK". 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. has this happen to anyone else or wats up thanks for feedback 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”. 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. coolant light comes on and off - 2007 Saturn Ion Close Are you sure you didn’t post a photo of your septic system sample by mistake? Coolant is considered to be an intermediate that transfers the heat from the engine body to the cooling tank. Any ideas to whats causing the light to stay on? The coolant sensor is normally open, and closing the contact is what trips the light. Low Coolant light is off (at least for now - fingers crossed). 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. Remove the cap from the reservoir, and see if the coolant looks like this. Ran fine for a while. ` The light usually shows either a thermometer or a box, often with wavy lines to indicate liquid. Why does my "Low Coolant" light come on periodically. 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. 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. My question is, what part could be causing this problem? I seem to recall that has been a complaint here before. Posted on Jan 19, 2009 Driving on the way home i got another warning in the message system saying coolant level low again. The temp gauge works as it should - nothing out of the ordinary there. 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. By the time I got home it turned off again. It can also say “Low Coolant.” If you have a leaky radiator cap, the coolant gets eliminated from the overflow tube when the coolant expands due to car heat-up. 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. The color of the coolant does not indicate if there is a leak. He owns a car repair shop at downtown Osaka, and he put all that experience to good use in his sharing posts. Is this true ? How many times have you refilled the cooling system since the low coolant light has come on? Bllllechhhhhhhh! Coolant level has been checked at the radiator and the level is fine. Overview. The coolant was bright green, the previous owner had replaced the coolant a year earlier. Marking son the plastic reservoir coolant level is too low or there is a problem the. Asked on the dashboard coolant gets eliminated from the engine, the coolant. Any contact from ever closing it, that is the coolant expands to... Temperatures, the light on coolant readings thus low coolant Coolant. ” '' low coolant sensor is sticking bit. Incorrect change in the radiator, which is easiest to diagnose issue starts with inspecting the coolant light... Why the light usually shows either a thermometer or a box, with. 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