A low coolant level can cause the engine to run hot, resulting in the need for the fan to run more frequently to keep the engine cool.
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It’s best to have a professional mechanic diagnose the problem and suggest the appropriate solution. Electrical issues can also cause the fan to stay on after turning off the ignition. The A/C system also can cause the fan to stay on to dissipate the heat from the condenser. Cooling system issues like a malfunctioning thermostat, a clogged radiator, or a failing water pump can cause the engine to overheat and the fan to stay on. The engine fan in a car may stay on after the ignition is turned off due to a variety of reasons such as a malfunctioning cooling system, the A/C system still being on, electrical issues like a malfunctioning relay or a short circuit in the fan circuit and also the computer could control it. Why does the engine fan in my car stay on after I turn off the ignition? Running cooling fans help cool down the engine even after you turn off the car.
When the engine is turned off, the coolant doesn’t circulate, and the heat stays trapped, therefore prolonging the engine from cooling. When the engine runs, the coolant circulates and flows to the radiator, where heat is dissipated. If there is an electrical issue, the fan may stay on all the time, even when the engine is cold, until it drains the battery.
The radiator fan may run up to five minutes and sometimes longer. This is normal in many vehicles, such as BMW or Mercedes-Benz.
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