![]() ![]() So, if the radiator cap is loose, there will be insufficient pressure inside the radiator which will cause the coolant to boil at lower temperatures. The lower pressure inside the system will cause liquid to boil at lower temperatures. The greater the pressure builds up inside the system, the higher will be the boiling point. The pressure inside a closed system affects the boiling point of the liquid. Moreover, a loose radiator cap will prevent the necessary pressure to build up inside the radiator. A tight or loose radiator gap causes air to leak into the radiator and form air bubbles in the coolant that can make their way to the engine and damage it. If you see coolant boiling inside the overflow tank, chances are that a radiator cap is loose which will cause the check engine light to turn on after topping off the coolant. A coolant leak also causes white smoke from the exhaust.įurthermore, you should check the coolant level in the coolant reservoir the next few times you drive your vehicle after topping off the coolant. When the engine is running, the high pressures cause the water pump to reseal.Īnother way to check a coolant leak is to open the oil filler cap and see if you are observing a milky texture or smelling a maple syrup-like smell. A cold engine will only show signs of a water pump leak as a slight dripping on the pulley attached to the water pump. Some vehicles are known to have water pump problems/leaks. Without the engine running, you should check the water pump. Lastly, after you have filled the coolant to a certain level, make sure the coolant is not leaking from anywhere in the engine. It is not advisable to fill the coolant up to the MAX level of the overflow tank as the coolant expands when the engine is heated while it is running. ![]() If you have not properly filled in the coolant, the coolant pressure sensor will detect abnormalities, due to which the engine computer will cause the check engine light to turn on. If you do a coolant flush and add a new coolant, you need to add coolant in the overflow tank as well as in the radiator. If you have not filled the coolant to the appropriate levels, the engine computer will think that the engine is running low on coolant, due to which it will turn on the check engine light to prevent engine damage from overheating. Can Too Much Coolant Cause Check Engine Light?Ĭauses Of Check Engine Light Still On After Filling CoolantĬheck engine light still on after the coolant flush is due to the following reasons: 1.Codes Unrelated To The Engine Cooling System Malfunctioning Engine Coolant Temperature Sensor Causes Of Check Engine Light Still On After Filling Coolant.You should have an OBD2 scan tool to pull the trouble codes so that you can find the root cause of the check engine light still on after filling the coolant. But, the cause of the check engine light was something else. So, you filled the coolant and expected that the CEL will go off. You thought that it was because of a low coolant level. Furthermore, there is a possibility that the check engine light of your vehicle was on at the same time when the coolant level was low. If the check engine light is still on after filling coolant, the chances are that the coolant thermostat is stuck open or coolant temperature sensor is faulty. If the level is low, it could be the reason the light is still on. Before you start to panic, first, you can check if you have filled the coolant to the proper levels in your car. You’re not sure what to do and you’re starting to get a little worried. You’ve been driving your car for a while now and you’ve noticed that the check engine light is still on after you’ve filled the coolant or have done a coolant flush. ![]()
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