When do you need to replace a cooling fan relay?

The relay controls the engine’s cooling fans as well as the fan for the A/C condenser. It also saves electricity. Since excessive heat will damage the vehicle’s parts over time, a bad relay must be replaced as soon as possible. The relay is a critical part of a cooling system.

How can you tell if a fan relay is faulty?

You’ll know the cooling system relay is faulty if the fan works with the substitute relay. You can also measure the relay coil’s resistance. A normal relay’s resistance will read between 40 to 80 ohms. Higher resistance levels warn that the coil has started to fail while lower readings mean the relay has broken down.

Where is the low speed radiator fan relay located?

The low-speed radiator fan relay is plugged into the Integrated power module. That is the fuse box under the hood. The high-speed relay is to the left of the radiator. Both of those are controlled by that module.

How can I find the correct blower motor relay?

Locating the correct relay can be tricky. Look for terms such as a blower, AC, or cooling fan relay on your schematics to point you in the right direction. Bring your damaged relay with you to the automotive or electronics shop to ensure you’re getting the right part for your blower motor.

When do you turn on the fan relay?

When the correct parameters are met, a temperature switch or the computer will activate the relay, which will allow power to the fans. The relay will usually be activated once it is detected that the vehicle’s temperature approaches excessively high temperatures.

What are the symptoms of a bad cooling fan relay?

1. Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.

How does the cooling fan relay work on a car?

The cooling fan relay is the relay that controls the engine’s cooling fans. When the correct parameters are met, a temperature switch or the computer will activate the relay, which will allow power to the fans. The relay will usually be activated once it is detected that the vehicle’s temperature…

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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 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 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 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 radiator cooling fan relay located?

The radiator coolant fan relay is located on the inside front of the engine compartment near the left headlight assembly. You have to remove the air filter assembly, then look for a simple square relay with 4 wires running into it. It is mounted with 2 screws. It is the only relay at that location.

What controls the AC fan relay?

The condenser fan relay is the electronic relay that controls the power to the AC condenser cooling fan. When the relay is activated the AC condenser fan is switched on so that it can keep the AC condenser cool. The AC condenser is designed to cool down and condense incoming refrigerant vapor into cooled liquid and uses the fan to help keep it cool. The fan’s power is controlled by the condenser fan relay.

Where is the cooling fan relay?

When the cooling fan relay gets its signal from the ECM, the wiring diagram will typically resemble the following illustration. 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.

Why does my Fuse for the radiator fan keep blowing?

BUT, if there is a short circuit before the fan, it will blow the fuse. Check the wiring is not chaffed or worn between fuse box and fan, or switch to fan. Unplug the radiator fan, replace the fuse and see if it blows again. If not, then its likely the radiator fan is shorted. Use an ohm meter and see what the resistance is.

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 do you replace a cooling fan relay?

The cooling fan relay has an electrical connector that will need to be disconnected and switched over to the replacement cooling fan relay. Most commonly used connectors are a push type connector. Disconnect connector and remove cooling fan relay. Step 3: Compare the replacement cooling fan relay to the one being removed.

When do you need to replace a cooling fan relay?