How do I know if my radiator 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.

Is there a relay for the 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.

Why is my radiator fan making noise?

Worn bearings, bent or broken blades, and unbalanced rotating assemblies can cause a fan to screech, howl, or otherwise make noises it shouldn’t. Fortunately, switching out a worn fan for a new one isn’t a huge ordeal.

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

Symptoms of a Cooling Fan Module Failure

  1. An overheating engine. When the cooling fan module fails completely, the cooling fans will not work at all.
  2. Cooling fans running non-stop.
  3. Poor circulation of fresh air in the cabin of the car.

How does radiator fan relay work?

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.

How does a radiator fan relay work?

What does a faulty radiator fan sound like?

A loud whirring Noise. In some cases, when the radiator cooling fan motor fails, you’ll notice a loud clicking or whirring noise that changes as you rev your engine.

How do I stop my car fan from making noise?

Here are three ways to make it happen:

  1. Spec a larger fan and run it a lower speed. It’s no secret the fan can be the largest source of engine noise in an application.
  2. Pair the fan with a variable-speed drive.
  3. Choose a fan designed to emit less noise.

How much does it cost to replace a fan relay?

A relay switch controls your furnace’s blower motor. The average cost to repair or replace a relay switch is $150–$300.