What does the relay on a cooling fan do?
The typical electric cooling fan circuit includes a temperature sensor, a relay, a control module and the fan motor. The relay is the component that fails most often; so be sure to test the relay as well as its power supply and ground connections.
What to do if your fan relay is broken?
Replace the relay. Another simple relay test is to shake it. If you hear something rattling inside, the relay armature is probably broken. The armature closes when the coil is energized to route power to the fan motor. The armature is normally closed and is pulled open when energized.
Can a bad fan relay cause an engine to overheat?
However, a bad cooling fan relay isn’t the only culprit for excessively high engine temperatures. Many other issues can cause the engine to run hot or overheat. Rather than uncommonly high engine temps, the driver may notice that the cooling fans have stopped running.
What happens when a radiator relay goes bad?
A faulty or broken relay cannot deliver power to the cooling fans. In turn, the unpowered fans won’t run, leaving the radiator to its own devices. Deprived of the helpful influx of air from the cooling fans, the radiator cannot remove as much heat as it usually does.
What is the relay for the AC compressor?
No cold air Almost every single electrical system on a car is powered through some kind of switch or electrical relay, and the AC system and compressor are no exception. The AC compressor relay is responsible for supplying power to the AC compressor and clutch.
When to turn on the cooling fan relay?
The cooling fan relay is an electromagnetic switch that controls the power supply to the engine’s cooling fans. It ensures that the energy-intensive devices only run when needed, usually when the vehicle is immobile. When the engine temperature approaches unsafe levels, the vehicle’s computer or temperature switch turns on the cooling fan relay.
How can I tell if my AC relay has a problem?
AC compressor is not turning on. One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all. In most cases, when the AC is turned on you will be able to hear the compressor switch on.
Is the radiator and condenser fan the same relay?
Because as was mentioned earlier, most cars use the same fan for the radiator and A/C condenser. There are, however, some models that use a dedicated second unit to the condenser. In such a scenario, the condenser fan and radiator fan may or may not share the same relay.
Can a fan be connected to more than one relay?
For smaller fans, both fans can be connected to a single relay as shown above, and the proper fuse should be installed to protect the circuit while at the same time providing enough current to flow without exceeding the fuse rating.
Why are my cooling fans running at all times?
3. 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.
Where does the battery connect to a cooling fan?
For a remote battery, it can be connected to a power port in the engine compartment, but it should be fused. The red wire from our relay connects directly to the cooling fan, and the black wire from the cooling fan connects to ground, both wires will utilize our supplied fan harness.
What is the function of a radiator fan relay?
The function of the cooling fan relay is to convert a low voltage signal from either the electronic control module (ECM) or a thermostatically controlled sensor. The cooling fan relay takes the low voltage signal and internally switches the relay “on” to allow battery voltage to be supplied to the radiator cooling fan.
Where is the coolant fan relay located?
The cooling fan relay is normally located in either the underhood fuse and relay center or mounted to the electric fan assembly behind the radiator. To replace the cooling fan relay, there are two methods that we will cover for the positions mentioned above.
Where is the fan relay?
Fan relay is located one of two places — inside the fuse box, or on the front radiator crossmember, down low, visible from underneath the vehicle, usually on driver’s side.
How to make a temperature controlled fan using Arduino?
Connect the GND pin of relay module to the GND of Arduino. On the output side of Keyes_SR1y relay module, connect the negative of the 9V battery to the Common (C) of relay module and connect the NC of relay module to negative of fan. Then connect the positive of battery to the positive of fan.
Where does the cooling fan in the engine go?
The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. A main cooling fan for the radiator. A second fan for the condenser.
How can I tell if my cooling fan is working?
The quickest way to tell whether or not the electric fan (s) are working is to start the engine; let it reach normal operating temperature and then turn the A/C on. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. A main cooling fan for the radiator.