Asked by: Blandine Pfafflin
home and garden indoor environmental quality

What does the cooling fan module do?

Last Updated: 6th September, 2021

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An A/C fan control module helps to control the blower that supplies air to the cabin of a vehicle, as well as the cooling fans. The module helps to make sure that the cool air that is produced within the A/C system of a car is blown into the cabin.

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Also asked, how does a fan control module work?

The engine control module has two relay-ground terminals—one for the low speed and the other for the series-parallel relay. So voltage flows through the left side cooling fan motor, through one circuit provided by the series-parallel relay contacts, through the right side cooling fan motor to ground.

Likewise, where is the radiator fan control module? Location. The Coolant Fan Control Module is located in the left front of the engine compartment next to the radiator. The Coolant Fan Control Module is located in the left front of the engine compartment next to the radiator.

In this manner, when should the cooling fan come on?

To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective.

How can you tell if a fan relay is bad?

Symptoms of a Bad or Failing 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.
  2. Cooling fans do not function. Non-functional cooling fans are another common symptom of a potential problem with the cooling fan relay.
  3. Cooling fans stay on at all times.

Related Question Answers

Suying Wiesejahn

Professional

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

Symptoms of a Bad or Failing AC Fan Control Module
  1. Cooling fans running for a long time. The cooling fans under the hood of your car are designed to keep the components of the system at a lower temperature.
  2. Cooling fans not running at all. If the cooling fans are not coming on at all, then this may also be a sign that the fan control module is damaged.
  3. Weakened air flow.

Camen Kubusch

Professional

How do you test a fan control module?

How to Test the Fan Control Module
  1. Start and idle the vehicle.
  2. Check for 12 volts at the T14 connector pin No.
  3. Check for 12 volts at pin T14/9.
  4. Check for 12 volts at pin T14/4.
  5. Check for a good ground at pin T14/6.

Macarena Tiemann

Explainer

How much is a fan relay?

To get your cooling fan relay replaced, you will pay, on average, $80-$160, depending on the type of car you have and the mechanic's fees. The labor should cost around $70, while parts should run you $10-$50.

Airidas Mayrle

Explainer

What does the fan relay do?

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.

Vicencia Moratinos

Pundit

How do you test a radiator fan switch?

  1. To test stage 2 of the fan switch, using a suitable ohmmeter or continuity tester check for continuity between the fan switch terminals 1 and 3 .
  2. Allow the engine to reach a coolant temperature as follows. The fan switch should have continuity (switch closed) at this temperature:

Loana Eizik

Pundit

Where is the cooling fan sensor?

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.

Zonia Zwierlein

Pundit

Should radiator fan run when AC is on?

Both radiator fans should always run when the AC compressor is engaged. Both radiator fans should always run when the coolant temperature sensor in the bottom tank of the radiator reaches about 212*F.

Saule Sluijters

Pundit

How do I know if my coolant temp sensor is bad?

Signs of a bad Engine Coolant Temperature Sensor
  1. Poor Mileage.
  2. Check Engine Light Activates.
  3. Black Smoke from the Exhaust pipe.
  4. Engine Overheats.
  5. Poor Idling.
  6. Do not Use Tap Water to Refill Radiator.
  7. Fix Oil Leaks and Gasket Immediately.
  8. Check for Coolant Leaks.

Duguneh Quarantanove

Pundit

Does the coolant temp sensor control the fan?

The sensor works by measuring the temperature that's being given off by the thermostat and/or the coolant itself. The temperature is then sent to the on-board control system. As the control system receives the temperature from the CTS, it may trigger the cooling fan to either shut off or turn on.

Abdiel Askew

Teacher

Can a bad thermostat cause radiator fan not to work?

If the thermostat is stuck open (allowing coolant to flow) it can cause the engine to run cooler than normal so obviously the fan wouldn't come on..but not like the engine/coolant can be running too hot and the thermostat somehow effects the sensor reading or operation of the fan.

Karamjit Steinhardt

Teacher

Can you drive a car without a radiator fan?

Yes, you can drive your car without a radiator fan, but you never should. Your vehicle's cooling system is crucial to its performance, and every time your engine overheats, you cause damage.

Nouradine Eichmayr

Teacher

Does the radiator fan have a fuse?

A radiator fan is necessary to keep your car cool. The fuses inside of the radiator fan must be in good working order to make sure that the engine is able to stay cool. Without these components your car overheats.

Hamilton Dzhahbarov

Beginner

Can relays overheat?

The only reason a DC relay would overheat is that it's being run above its rated voltage. An AC relay, on the other hand, draws a variable current. Initially, when it's open, the inductance is low so the current is high. The only reason a DC relay would overheat is that it's being run above its rated voltage.

Humberta Rief

Beginner

What makes the cooling fan come on?

Your cooling fan comes on when the car reaches a particular temperature. The trigger is the thermostat in the radiator of your vehicle. It is what sends the signal for the fan. Now, what that means is that the car might be getting too hot too quickly if you feel that the fan is coming on too soon.

Many Strater

Beginner

Are both cooling fans supposed to run?

cooling fans
The answer to your question is yes both fans will run when your at 230 degrees, if you have the parking lights on and your at 212 degrees one fan will come on, and when you have the air conditioning on you have one fan on as well.