Which relay is for radiator fan?

The fan relay is usually located near the bottom of the engine compartment on a metal frame member. The metal acts as a heat sink to keep the fan relay cool. So, unplug the connector at the relay and repeat the check for power. If you get power, you’ve got a bum relay.

What are the symptoms of a bad cooling fan relay?

Bad Cooling Fan Relay Symptoms

• The engine runs hot or overheats.
• The cooling fans don’t work.
• The cooling fans keep running.
• Warning lights.
• Poor air conditioning performance.
• Swapping Relays.
• Measuring the Relay Coil’s Resistance.
• Listening for Noises.

What do fan relays do?

The cooling fan relay essentially functions as the switch for the engine’s cooling fans, and is therefore an important electrical component of the vehicle’s cooling system. They will be able to look over your vehicle and replace your cooling fan relay if necessary.

Should radiator fan turn on when AC is on?

Both radiator fans should always run when the AC compressor is engaged. 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.

What sensor controls the radiator fan?

coolant temperature sensor
On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor.

How do you check if a fan relay is bad?

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.

How do you test a fan relay?

How to Check a Fan Relay

1. 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.
2. Connect the leads of an ohmmeter to the power terminals on the relay.

Do I need a relay for electric fan?

Most parts stores carry toggle switches and/or push-pull switches that will handle anywhere from 30-60 amps, so that would work. If you’re using one of those thermostatically-controlled deals (or a low amp rated manual switch) you should use a relay.

How do I know if my fan control module is bad?

Symptoms of a Bad or Failing AC Fan Control Module

1. Cooling fans running for a long time. The cooling fans under the hood of your car are designed to keep the components of the system at a lower temperature.
2. Cooling fans not running at all.
3. Weakened air flow.

Why does the radiator fan turn on when the AC is on?

The A/C runs on a separate circuit and is triggered by A/C system. The engine cooling system is normally triggered by the temp control sensor/sending unit or ECM/PCM depending on system, but virtually works under the same premise. Once it reaches a 200 plus or minus depending on vehicle the fan will kick on.

Does the coolant temperature sensor control the fan?

The sensor works by measuring the temperature that’s being given off by the thermostat and/or the coolant itself. The temperature is then sent to the on-board control system. As the control system receives the temperature from the CTS, it may trigger the cooling fan to either shut off or turn on.

Do you need a relay kit for a cooling fan?

A relay kit, our part number CCFKRL, will include everything you need to properly wire up your electric cooling fans, with the exception of additional wiring needed to complete all of the circuits. The first part of the installation is to install the electric fan to your radiator, and remove the mechanical fan.

What kind of fan does a thermo fan use?

The thermo fan wiring Discussed within this document includes, but is not limited to, EFs 3 Mode (4 Relay) Fan system. ELs 2 Mode (3 Relay) Fan System. AUs 2 Mode (3 Relay) Fan System. BAs 2 Mode (3 Relay) Fan System.

Where is the fuse on an electric fan relay?

The orange wire on the relay should see a 12 volt signal when the ignition switch is turned on. The other two wires on the relay are the meat and potatoes of the system, with the yellow wire connecting to the battery along with the supplied fuse mounted within 12 inches of the battery.

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.