Why does my cooling fan keep running?
Cooling fans stay on at all times If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times.
What causes cooling fan to stay on after car is off?
Why does my Cooling Fan Keep Running After the Car is Shut Off? The cooling fan in your car keeps running long after the car is shut off due to a overheating or fault with the relay. The reason behind this could be faulty temperature sensors or some issue with the cooling fan or ECU unit.
Why does VW fan stay on?
The fan controller, its wiring, connectors, and sensors default to ‘fans always on’ if there’s a fault or broken wire to protect the engine. The coolant temperature gauge doesn’t always use the same temperature sensor – that may work ok.
Why does my car fan keep turning on?
Engines operate at their most efficient when they’re hot but not too hot. The fan turns on when you’ve stopped driving because no more cooling air is flowing into the engine bay. This causes the temperature to rise, automatically triggering the fan.
Why does my TDI cooling fan run after shutting the engine off?
Rest assured—this is in fact normal operation. The after-running of the cooling fans is deliberate and can sometimes last up to 16 minutes after switching the engine off. The after-running process prevents excessive engine compartment temperatures caused by the diesel particulate filter regeneration cycle.
When should the cooling fan come on?
To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective.
Why does the radiator fan come on?
The fan’s job is to keep the radiator fluid/water mixture cool while you drive. If, for example, you’re stuck in traffic, you will not have enough air circulating over the radiator to cool the fluid and engine. The fan turns on to circulate additional air.
Why does the fan come on in a diesel car?
The after-running process prevents excessive engine compartment temperatures caused by the diesel particulate filter regeneration cycle. The cooling fans may continue to run even after driving less then 3.2 km.
What causes the radiator fan to come on?
You may hear the fan running when you shut off the engine after driving. This is normal. But the fan should shut off after several minutes as the engine cools down. The fan also comes on when the A/C is turned on to provide additional airflow through the condenser for good cooling performance.