Why Radiator Fan Stays On After Car Is Off?

The motor contains an ignition chamber where blasts occur to give force and warmth to the vehicle. These blasts cause the motor to warm up incredibly rapidly and can now and then prompt overheating. This is a motivation behind why the radiator fan turns on when the vehicle begins.

The coolants move all through the radiator and into the motor to keep the temperature at a useful level. The work of the radiator is to keep the coolant at the right temperature with the goal that when it heads out back to the motor, it can take on more warmth, and keep the motor from getting excessively hot. But what when the radiator fan stays on after car is off?

Why Radiator Fan Stays On After Car Is Off?

At the point when the motor is running, the coolant courses from the motor and streams to the radiator. Where warmth is disseminated. At the point when the motor is killed. The coolant doesn’t circle, and the warmth stays caught, accordingly delaying the motor from cooling. Running chilling fans help cool off the motor even after you turn off the vehicle. Here are some possible causes of why the radiator fan stays on after car is off.

1. Low Coolant Level

Check the motor coolant level. In the event that your motor coolant’s excessively low, it implies that the cooling fan should work more enthusiastically to keep the motor at an ordinary temperature.

2. Faulty Temperature Sensor

The sensor peruses the framework’s temperature and decides when to turn the fan on. In the event that it isn’t working as expected, odds are that the fan will not turn on. And the vehicle may overheat, therefore. All things considered, try to check the sensor found in the indoor regulator cover. Do as such by separating the wiring from the sensor and contacting them together. On the off chance that the fan begins, it just implies that the sensor needs substitution.

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In most present-day vehicles, the cooling fan is constrained by the Engine Control Unit (ECU) which gets a sign from the coolant temperature sensor. On the off chance that it’s not working, the fan will not turn on when it needs to, which implies the motor may overheat.

3. Defective Fan Relay

The fan hand-off controls the capacity of the cooling fan. In the event that there’s an issue with the transfer, the fan will be influenced. It might make the fan cut in and out, or not please by any means.

4. A Wiring Issue

The initial segment to check is the fan wiring when the fan isn’t working. Start by unplugging the positive and negative feed wires (should put out around 12 volts DC). Then, at that point, verify whether there’s at present accessible with a voltmeter. If not, investigate the wires and the fan transfer under the vehicle’s hood. On the off chance that there’s a voltage from the fan to the hand-off, the odds are that the fan might be flawed and should be supplanted.

5. Fan Clutch

The fan grip shouldn’t be disregarded too, as it keeps the fan on the motor and helps it turn. Odds are that the springs inside the fan grip may consume or wear out after some time. On the off chance that any remaining parts appear to be working ordinarily. The fan’s disappointment is in all likelihood brought about by the grasp. In the event that it undoubtedly is the guilty party, it ought to be supplanted right away.

Ordinary vehicle examination, remembering for the cooling fan, is principal to the vehicle’s life expectancy. In the event that the cooling fan quits working, try to check the parts referenced previously. On the off chance that it’s as of now old, broken, and dry. It is crucial that you supplant it right away.

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Remember that the cooling fan is one of your vehicle’s most indispensable parts. Without it, your motor will overheat rapidly and ruin it accordingly.

6. The Radiator Hose Is Broken

The radiator hose can be broken in a wide range of ways. In the event that you feel happy with investigating it yourself, check for spills, expanding, openings, imploded, broke, or a delicate hose. When you notice any of these, your radiator hose should be supplanted on the grounds that it has turned sour.

What To Do When Radiator Fan Stays On?

Did you notice that your radiator fan stays on after car is off here is the step to step guide of what to do in this situation?

Step 1

Open the hood and find the wire transfer box on the driver’s fender well. Eliminate the top.

Step 2

Peer within the top and for the planning of the wires and transfers with their area. Pull the cooling fan hand-off out of the container.

Step 3

Supplant the cooling fan hand-off with another one. A stuck shut transfer is a solitary thing that can work the cooling fan persistently with the key off. The PC loses power with the key off and the equivalent applies to the coolant temperature sensor. The hand-off, nonetheless, has direct capacity aside, equivalent to a light switch. The PC sends capacity to the hand-off to initiate it and turn the fan on. Once initiated, in any case, assuming the hand-off sticks in the shut position, the fan will run until the battery is completely released.

How Much Is A Radiator Fan Relay?

By and large, $80-$160, contingent upon the kind of vehicle you have and the technician’s charges. The work should cost around $70, while parts should run you $10-$50.


I hope from this article you have the answer to the question of why the radiator fan stays on after car is off. The radiator fan is an urgent piece of your vehicle that is accountable for cooling the vehicle and keeping the tenants at a typical temperature level. These cooling radiator fans are basic when your vehicle is running gradually or standing by, as outer wind current won’t travel through the grille and cool off the travelers.

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