What to do if your cooling fan relay is failing?

For this reason, if you suspect that your cooling fan, or relay, may possibly be having issues, have the vehicle diagnosed by a professional technician, such as one from YourMechanic. They will be able to look over your vehicle and replace your cooling fan relay if necessary.

Where is the relay on a radiator fan?

The fan relay is often located in the engine bay’s fuse box, but the best way is to check your repair manual to find where it is located. Testing a 4 pin relay is often very straightforward. Remove the relay and give 12 volts to pin 30 and 85. Ground pin 86 and check if there is voltage coming out from pin 87.

Why is my radiator fan not working properly?

The fan clutch is the assembly that holds the radiator fan to the engine and makes it turn. If this burns out or fails, you’ll need to replace it. There are springs within the fan clutch that can wear out or corrode over the years. If everything else seems to be fine, the fan clutch is the most likely cause of radiator fan failure.

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.

How do you test a radiator fan relay?

Open your hood and take some time to locate your fusebox, which is mounted in front of the passenger side of the firewall. Remove the top cover to expose your fusebox and relays, check your radiator fan relays and remove them. Inspect for any damage to the pins or the body of the relay, such as bubbling or melting.

How to diagnose radiator fan problems?

Part 8 of 9: Check if the radiator cooling fan is faulty Locate the radiator cooling fan. Park your vehicle and apply the parking brake. Open the hood and locate the radiator cooling fan. Warm the engine. Start your vehicle and allow the engine to run until it begins to get hot. Check the cooling fan. When the engine starts to get above the normal operating temperature, watch the cooling fan.

Why is your radiator fan not running?

The most common causes when a radiator fan is not coming on is broken fuse, bad wirings, bad coolant temperature sensor, bad fan relay, or a faulty radiator fan . Here is a more detailed list of the most common causes of a radiator fan not coming on.

Why does your radiator fan keep going on and off?

Here are some possibilities causing the fan to stay running longer. low coolant level, faulty coolant temperature sensor, PCM or ECU defective. coolant leaks from the water pump, cracked radiator, worn upper or lower radiator hoses, leaky heater core, leaky thermostat housing,

Where is the cooling fan relay ( or switch ) located?

Where is the cooling fan relay (or switch) located. I want to replace it in an attempt to get the fans to work again. Where is it located. The radiator cooling fans will not come and it causes overheating. It may be the fan relay or switch (whatever it is called).

How does the mode control relay work on a radiator?

The relay (s) are used to control the high current flow to power the cooling fan motors. When minimum cooling is required, the BCM will command the PCM to energize cooling fan relay #1 and since both fans are connected in series through the Mode Control relay, both fans will operate at low speed.

How do you check for a faulty relay?

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 can you tell if a relay has a blown fuse?

If voltage is able to flow through that side of the relay, move on to the 87 connection point and determine if battery voltage is present there. If it isn’t, that also suggests a blown fuse or circuit breaker. Checking the connection points in the fuse box with a multimeter will confirm if battery voltage is available at the relay terminals.

How does a relay work in normal condition?

Relay in NORMALLY OPENED condition: When sufficient voltage is applied to the core it starts to create a magnetic field around it and acts as a magnet. Since the movable armature is placed within its range, it gets attracted to that magnetic field created by the core, thus the position of the armature is being altered.

How can I tell if my cooling fan relay is bad?

There are several ways to tell if a bad cooling fan relay is to blame for an overheated engine. The easiest method is to start the engine and then turn on the air conditioning. If the fan doesn’t engage, there may be something wrong with the cooling fan relay.

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.

Can a radiator fan and condenser fan share a relay?

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. If the cooling fan does not engage, you can check whether the relay is to blame by swapping it out for a different relay.

What are the different types of fan relays?

There are several types of cooling fan relays. Their main difference involves the winding armature that they use to complete an electrical circuit. The most common type of relay uses an open armature. When the relay coil gets energized, the armature closes. The completed circuit allows the current to flow to the fan motor.

What does it mean when your radiator fan is not working?

This is what we call a blown fuse. A blown fuse is no big deal, and changing one does not cost a lot of money. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan.

What to do if your cooling fan relay is failing?