It’s normal for some vehicles to have a fan run for a few minutes after the car is shut off, generally to keep the engine cool. However, if the fan is running for an extended period, the fan itself can become damaged due to overuse. … It’s possible you may have a module or relay failing in your car.
An electric fan SHOULD NOT run all the time. A mechanical fan WILL spin as long as the engine is running, but it will only ‘lock up’ when needed. … Both radiator fans should always run when the coolant temperature sensor in the bottom tank of the radiator reaches about 212*F.
Thereof, How do you test a cooling fan relay?
Also to know is, How do you test a fan motor relay? Connect a test light or multimeter to the ground (black lead). Turn the ignition key to the on position (engine off), and remove the relay. Using the probe, test all terminal sockets in the relay connector. Two of the four should have power.
Subsequently, question is, Why Does My Car fan come on when I stop? Troubleshooting Tips If the fan turns off, that means the relay is at fault. Furthermore, check for low coolant level and possible leaks that may be causing it. Usually, a low coolant will equate to a hotter engine. Therefore, it will activate the fan more often.
Also, Why does my cooling fan stay on all the time?
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 a fan relay to go bad?
Cooling fan relays can stop working for any number of reasons. Common causes for relays going bad include: Overheating caused by the relay or a part mounted on or near the radiator.
How do you test a blower motor relay?
What are the symptoms of a faulty cooling fan switch?
– Engine overheating. Engines generate an enormous amount of heat and as a result are subjected to very large temperature swings if this switch does not operate effectively. …
– Check Engine Light comes on. …
– Broken or shorter signal wire.
Where is the blower motor relay?
Locate your vehicle’s blower motor relay. In the vast majority of vehicles, you can access the relay through the glove compartment.
How do you test a cooling fan switch?
– Connect your test light to battery ground.
– Start and idle the engine, and backprobe the connector terminals with the test light. …
– Wait for the engine to reach operating temperature.
– Now backprobe the other wire at the connector.
Why does my fan stay on when I turn my car off?
It’s normal for some vehicles to have a fan run for a few minutes after the car is shut off, generally to keep the engine cool. However, if the fan is running for an extended period, the fan itself can become damaged due to overuse. … It’s possible you may have a module or relay failing in your car.
How do I test a fan relay with a multimeter?
– Look at the markings on top or side of the relay case and locate the two control circuit terminals, which connect to the relay’s coil, and the two power circuit terminals, which let electrical current pass to the fan. …
– Connect the leads of an ohmmeter to the power terminals on the relay.
How do you test a blower motor?
What can cause a blower motor relay to go bad?
Blower motor relays tend to wear out over time from the stress of constantly flicking back-and-forth. These signs indicate a possible issue with the blower motor relay. When the blower motor does not respond at all, it may not be due to mechanical failure within the motor itself.
How can I tell if my blower motor is bad?
– Weak airflow from the vents. One of the first symptoms of a potential problem with the vehicle’s heater blower motor is low airflow from the vents. …
– Fan only blows at certain speeds. Another symptom of a bad or failing heater blower motor is a motor that only functions at certain speeds. …
– No air from the vents.
How do you check if a relay is working?
The only tool required to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located).
How do I know if my blower motor relay is bad?
– Blower motor does not function. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. …
– Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. …
– Melted relay.
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