Low Coolant Light Comes On And Off- What Does It Imply?

Do you often get confused as to what that low coolant warning sign fluctuations indicate? 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. For starters, there may be several reasons associated with it. 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 deal with it. So for your convenience, we have listed out a few reasons that could be the reason behind such signal variations.

 Low Coolant Light Comes On and Off – 4 Common Reasons

Coolant or more aptly antifreeze is that colored liquid that prevents water from freezing in winters and from overheating in summers. But when the low coolant sensor turns on and off no matter what the season is, you may have several questions in mind. The first step towards addressing the issue starts with inspecting the coolant levels. If that is not the case, then the following reasons could help you know better.

1. Sensor Malfunctioning

If the coolant level indicator, turns on and off for no real reason this means that your car’s sensors have failed. A malfunctioned coolant sensor may lead to a diminution in fuel efficiency or it may even lead to improper emission readings. The reason behind such defective sensor would be a probable loose connection. 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.

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2. Coolant Leaks

A coolant leak can cause your car’s efficiency to deteriorate. If you have a leaky radiator cap, the coolant gets eliminated from the overflow tube when the coolant expands due to car heat-up. 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. However, the third reason for a leaky coolant could be a physical puncture in the radiator, which is easiest to diagnose. 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.

low coolant light comes on and off
Never Underestimate The Influence Of low coolant light comes on and off. Source: DoItYourself.com

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3. Cold Weathers

When you park your cars in cold or freezing temperatures, the coolant fluid tends to contract. This tightening of coolant leads to lighting up of low coolant sensors. 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. You could either top it off by yourself or let your mechanic do the job for you. Browse across maintenance tips to find out which top it off is best for your car.

4. Faulty Thermostat

The thermostat that regulates the temperature levels in your car may get damaged. 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. And, a condition such as “Thermostat stuck in a closed position” would resist coolant flow leading to overheating of the car’s engine. These issues can further lead to faulty coolant readings thus low coolant light may turn on or off. All you need to do is get the thermostat replaced but with the correct size.

Causes for low coolant light comes on and off
Reasons for a low coolant light comes on and off. Source: Youtube


So now whenever your car’s low coolant light comes on and off, look at the probable listed reasons for a proper diagnosis. 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”.