Why does the fan come on when the engine is turned off?
Why does the fan come on when the engine is turned off?
When the engine is turned off that pump is not working and the water is not moving so if the engine has been running warm the water is hot and needs to cool down and the fan will come on for a short time. Keep this in mind if you may to be working in the engine compartment and stay clear of the fan. If that fan comes on it can take your fingers.
When does a car cooling fan turn on?
The cooling fans are designed to turn on once a certain temperature has been reached inside of your vehicle, or certain conditions have been met. If the cooling fan is failing or damaged, the engine temperature will continue to rise, and eventually overheat.
How long does it take for the radiator fan to turn on?
Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. This typically takes about 15-20 minutes for the engine to reach the right temperature for the radiator fan to turn on in older cars.
Why does my radiator not turn on when I start the car?
However, if you are able to notice the telltale signs and symptoms of a bad or failing radiator fan motor, you might be able to stop the problem before it gets worse. The most common symptom of a faulty cooling radiator fan motor is that the cooling fan does not come on when you start the car.
Why does the engine fan turn on when the ignition is turned on?
Therefore when the ignition is turned on and the engine is cold, both relays are energized, and the Cooling Fan Motor (9) does not receive any current as the contacts in Radiator Cooling Fan Relay (8) are held open.
Can a car fan still run after the engine is turned off?
Then you notice the engine cooling fan is still running even though the car is turned off. It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. Your car fan will run for a few minutes after you turn off the car then turn off. This is normal in many vehicles, such as BMW or Mercedes-Benz.
When do you turn on the fan relay?
When the correct parameters are met, a temperature switch or the computer will activate the relay, which will allow power to the fans. The relay will usually be activated once it is detected that the vehicle’s temperature approaches excessively high temperatures.
Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. This typically takes about 15-20 minutes for the engine to reach the right temperature for the radiator fan to turn on in older cars.
