How can you tell if a fan relay is bad?

Bad Cooling Fan Relay Symptoms

1. The engine runs hot or overheats.
2. The cooling fans don’t work.
3. The cooling fans keep running.
4. Warning lights.
5. Poor air conditioning performance.
6. Swapping Relays.
7. Measuring the Relay Coil’s Resistance.
8. Listening for Noises.

Which relay is for radiator fan?

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 I know if my HVAC relay is bad?

1. Inconsistent cooling. The AC compressor is powered by the relay.
2. 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.
3. No cold air.

How do you tell if a relay is burned out?

You want to feel and listen for any clicks. If you feel and hear clicks, the relay works on one side – the side with the energizing circuit and coil. However, if there was no sound from the horn, the relay has a problem along the contact circuit.

What is a cooling fan relay?

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 approaches excessively high temperatures.

What happens if the radiator fan relay fails?

If the relay fails, it will be unable to supply power to the fans, and as a result they will not operate. This can lead to overheating, especially when the vehicle is at a stop, where there is no forward motion by the vehicle to pass air over the radiator. 3. Cooling fans stay on at all times

How do I know if my fan relay is bad?

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. If the relay shorts or fails, it will not be able to supply the power for the fans to operate and keep the engine running at normal temperatures.