![]() The engine computer sees something is wrong. It cannot flow smoothly to all engine parts. So the coolant boils at too low a temperature. With a loose radiator cap, there is not enough pressure in the radiator. Less pressure means a lower boiling point. More pressure means a higher boiling point. A loose radiator cap also stops the right pressure from building up inside the radiator. Air in the coolant can damage the engine. If it is loose, air can leak into the radiator. ![]() Loose radiator cap affecting coolant pressure in the cooling system ![]() If the coolant level is low, that could be why the check engine light is still on. You’re starting to worry a little.īefore you start to feel scared, first check if you filled the coolant to the right levels in your car. You saw the check engine light was still on after you filled the coolant or did a coolant flush. You’ve been driving your car for some time now. 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. Often you’ll just need to connect it to the port at the bottom left of the driver side dash.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. You can scan your car with a basic OBD-II scan tool. Usually the computer turns the cooling fans or a light on the dash on if there’s a problem with how the engine is running. While not common, there can be more than one sensor in some cars and trucks, and one of these may turn the cooling fans on if there’s a problem. The computer takes a reading of its temperature to adjust the engine’s performance. The coolant temperature sensor (CTS), also known as an engine coolant temperature sensor (ECT), resistance changes depending on its temperature. More on how to check for a coolant leak 2. If the coolant level is too low, the radiator cooling fans may stay on. You could also have an overheating engine from a coolant leak. More on inspecting cooling fans and an overheating engine at idle ![]() The airflow from driving will help cool the system down, but removing this when at idle can cause the engine to heat up. If you have a car that overheats when at idle but not as much when driving, there may be an issue with the radiator fans. This can be noticeable at idle, which is when the car is running but parked or braked and sitting still. The engine could be overheating from a problem with the cooling fans. If there is an issue with any of these parts, the computer can turn the radiator cooling fans on high to prevent the engine from overheating. Top Causes of a P0128 Code or a Radiator Fan That Won’t Turn Off The coolant is not getting up to the correct temperature, and the computer can’t tell if there’s a problem with the coolant temperature sensor, the engine not working, or the thermostat. In the video featured above, code P0128 appeared, which is related to the radiator cooling fans. Causes and Fixes of a Radiator Fan That Won’t Turn Off or a P0128 Code
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