The coolant helps regulate internal engine temperature and when it runs low, it causes engine overheating, setting off the engine warning light. Low coolant level in your car radiator can trigger check engine light. Now you know the relationship between low coolant and check engine light. The best thing to do here is to check the coolant level when your engine is cold and top it up if necessary. When you start the car, the coolant heats up and expands and its level raises, making the sensor “think” there’s enough coolant, so it goes off. When the coolant in the radiator is cold, the coolant level sensor activates the warning light. This happens because the coolant has a variable volume that varies with engine temperature. If the coolant light comes on when you start your car and then goes off once you start driving, it’s another sign that the coolant level is low. Why does my coolant light come on when I start my car? Remember, the coolant system is pressurized, and opening it too soon may result in hot liquid and steam gushing and causing scalding.ģ. DON’T open the reservoir cap until you have given the reservoir sufficient time to cool down (this should be between 15 and 30 minutes, depending on the engine size). In ideal conditions, the coolant levels should fall between MIN and MAX markers that are on the side of the tank. If you can’t see any steam, go ahead and pop open the hood and inspect the coolant reservoir tank level. If steam is escaping from under the car hood, then it’s even risker and you should wait until it subsides. The fact that the low coolant triggered the CEL means it’s extremely hot, so we don’t advise you to go anywhere near it immediately after you pull over. Asses the traffic conditions to help you know when and where to safely pull over and switch off your car engine. This step is necessary to help transfer some of the heat produced away from the engine and prevent damage. Turn on the heater immediately at maximum temperature and maximum fan speed. This is common with Audis and VW cars.Step 1. If you turn the car off and on and the message goes away. Sometimes there is nothing wrong with your Audi cooling system and the check coolant level message can be caused by a false alarm. Wrong Coolant Type:Īlthough this rarely causes the problem if you have recently changed your coolant, then make sure that you have used the right type of coolant for your car a G12 Coolant is recommended for Audis. Since a car cooling system is a high pressure even the tinniest hole in the cap will leak coolant and create a check coolant level message. If there is no leak, then you need to replace the cap with a new one. If you have recently checked your coolant level and it was full, then you should check the cap for any leaks (usually around the neck area). Leaking Coolant Tank Cap:Ī leaking coolant tank cap can cause a low coolant level message on the Audi dashboard. Then the problem is caused by the sensor rather than low coolant. If the coolant level sensor malfunctions, this will cause a low coolant level message on your Audi dashboard.Ī simple way to check if the error is caused by a bad coolant level sensor is if you check your overflow tank (Coolant Reservoir) and if the coolant level is above the minimum mark. It measures how much coolant is in your car’s cooling system and sends this information to your vehicle’s computer. Bad Coolant Level Sensor:Īnother common cause is a bad coolant level sensor which is located under your Audi expansion tank (Coolant Reservoir).Ī coolant level sensor is a small electrical component that is attached to the cooling system. The first and most common cause of a low coolant message is simply that your coolant level is below the minimum required level, This is straightforward check your coolant reservoir, and if it is below the minimum, top up with anti-freeze. Now, lets look at the common causes of a low coolant level message. Switch Off Engine and Check Coolant Level Coolant Causes This doesn’t necessarily mean that you need to replace all of the coolant, what it means is that you should check where your current level is at and top up if necessary, however, this is not only caused by low coolant, other things like a leak in a cooling system. The first thing is that the message means that your coolant level is low and needs topping up. What to Do if the Turn off engine and check coolant level comes on your Audi?Īlthough the message is pretty straightforward, there are some things you should keep in mind when dealing with this issue.Switch Off Engine and Check Coolant Level Coolant Causes.Audi ” Switch off engine and check coolant level” meaning.
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