Where is the coolant relay?

Table of Contents

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.

How do you test a radiator relay?

So just take the leads turn those three and five and we should hear an audible alert.

Is there a relay for the radiator fan?

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.

How do I know if my AC fan relay is bad?

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.

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.

Is there a fuse for cooling fan?

Check Fuses
The first thing you want to do when your radiator fan is not spinning is to check the fuses. There will be a large fuse for the fan itself that you want to check. It will be between 30 and 50 amps, and it is usually a larger fuse located in the engine compartment.

What sensor turns on the radiator fan?

On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor. If it’s not working, the fan won’t turn on when it needs to, which means the engine might overheat.

How do you check if a relay is good?

Grab a multimeter and set it to Ohms. Touch the leads across the electromagnet coil pins and measure resistance. Anywhere from 50-120 ohms is OK. Out of range or open means a bad electromagnet coil winding and time for a new relay.

How do you check if a relay is bad?

Easiest Way to Check a Relay – YouTube

How do you know if a fan relay is stuck?

How Do You Know If Your Relay Is Stuck And Needs To Be Fixed?

The air conditioner doesn’t turn on when you try to use it.
The air conditioner turns off unexpectedly.
You hear a clicking noise coming from the air conditioner.
Visible damage or debris on the relay.

Can a bad thermostat cause radiator fan not to work?

If this thermostat doesn’t open when the engine reaches the working temperature, the coolant will stay inside the engine block and the engine will start to overheat. This will result in the radiator fan not working.

What are the symptoms of a faulty coolant temperature sensor?

What Signs May Signal Your Coolant Temperature Sensor May Be Failing?

Poor Fuel Economy.
Irregular Temperature Readings.
Black Smoke from Your Exhaust.
Your Engine is Overheating.
Your Check Engine Light is On.

What causes cooling fans not to come on?

Six things may prevent an electric cooling fan from coming on: Defective temperature switch, coolant sensor or other sensor. Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan) Faulty fan relay.

How can you tell if a fan fuse is blown?

Look at the fuse wire. If there is a visible gap in the wire or a dark or metallic smear inside the glass then the fuse is blown and needs to be replaced.

What causes a radiator fan to not turn on?

The most common reasons why a radiator fan is not working are due to a blown fuse, a bad relay, or a broken wire. It can also be caused by a faulty coolant temp sensor, low coolant level or the fan itself can be damaged.

Does the coolant temp sensor control the fan?

What are the common faults of relays?

The two most common failure mechanisms of relays are contamination and mechanical wear of the internal switching elements discussed as follows: a. Contamination is a major cause of early life failures.

Is there a way to test a car relay?

How to Test Car Relays – YouTube

What happens when a relay goes bad?

If the relay fails it will cut off power to fuel pump and ignition system, which will result in a no power, and therefore no start condition. You may find that turning the key may power on the accessories, and may even crank the engine.

Do relays click when they go bad?

If your starter relay has gone bad, the electrical signal will never make it from the battery to the starter motor. As a result, your engine won’t turn over – no matter how many times you turn the key. A faulty relay often produces an audible clicking sound when you turn your car.

How does a thermostat relay work?

A 24V thermostat circuit sends electricity to the relay coil. That coil changes the 24V into magnetism. Inside the relay, that magnetism flips the switches to turn line voltage HVAC equipment on and off. A relay usually has multiple switches.

What fuse controls the radiator fan?

If your car’s radiator fan is not working, check your car’s owner’s manual and find the fuse for the radiator fan controller or the fan. The fan itself often uses a large fuse of around 50A, while there may also be a separate small fuse for the fan control module.

How do I know if my thermostat is stuck open?

Remove the radiator cap and idle the engine. If the coolant flows right away, your thermostat is stuck open. If it is not flowing, wait until your engine warms up. The coolant should warm to the right temperature and begin to flow after 10 to 20 minutes.

How do I know if my temperature sensor is working?

Submerge your temperature sensor in the hot water and wait a few seconds to let your multimeter take a reading. Write down your reading so you can easily reference it. A hot water reading should give you around . 25 volts.

How can you tell if your thermostat is stuck?

If it is not flowing, wait until your engine warms up. The coolant should warm to the right temperature and begin to flow after 10 to 20 minutes. If it does not start to flow, but the temperature gauge on your dashboard rises, your thermostat is stuck closed.