How do you diagnose a bad cooling fan?

How do you test a bad cooling fan relay?

The quickest way to tell whether or not the electric fan(s) are working is to start the engine; let it reach normal operating temperature and then turn the A/C on. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser.

What causes cooling fans not to come on?

Six things may prevent an electric cooling fan from coming on: … Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan) Faulty fan relay. A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.)

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.

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What are the symptoms of a faulty cooling fan switch?

Symptoms of a Bad or Failing Thermo Coolant Fan Switch

  • Engine overheating. Engines generate an enormous amount of heat and as a result are subjected to very large temperature swings if this switch does not operate effectively. …
  • Check Engine Light comes on. …
  • Broken or shorter signal wire.

12 янв. 2016 г.

Should radiator fan run all time?

An electric fan SHOULD NOT run all the time. … The fan turning on is normal and a consequence of the hot coolant, not a cause. The coolant may not be moving due to a water pump problem, blockage in the radiator or hoses, or a stuck valve, i.e., the “thermostat” in the coolant line.

When should the radiator fan kick on?

Your radiator fan should kick in at about 200 degrees Fahrenheit. If you notice your vehicle is overheating or at the very least running hotter than it normally does, listen for the fan to see if you can hear it.

How can you tell if your thermostat is stuck?

If you see your temperature gauge going into the red within the first 15 minutes of driving, your thermostat may be bad. Generally, if your vehicle is overheating within 15 minutes or so of driving it, this may be a sign that the thermostat is stuck. Step 2: Check the radiator hoses.

How do you fix a fan that stops working?

Floor Fan Stopped Working? Your Troubleshooting Guide

  1. Check the Cord. It sounds simple, but your first step should be to make sure the cord is securely plugged in. …
  2. Check Your Circuit Breaker. …
  3. Check for Power to Your Outlet. …
  4. Check the Fan Fuse. …
  5. Replace the Cord. …
  6. Clean the Fan. …
  7. Grease the Motor. …
  8. Call Customer Support.
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8 мар. 2018 г.

Should radiator fan turn on when AC is on?

Both radiator fans should always run when the AC compressor is engaged. … 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.

How much does it cost to fix a radiator fan?

The Best in Auto Repair

The average cost for radiator fan motor replacement is between $591 and $624. Labor costs are estimated between $111 and $140 while parts are priced between $480 and $484. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.

Does a car thermostat control the fan?

The fans are controlled either with a thermostatic switch or by the engine computer, and they turn on when the temperature of the coolant goes above a set point. They turn back off when the temperature drops below that point. Rear-wheel drive cars with longitudinal engines usually have engine-driven cooling fans.

How do you test a radiator fan motor?

Unplug the fan connector closest to the fan. Make up some jumper cables. Then connect them directly, from the battery to the fan motor, to see if it spins. Consequently, if it does not spin it is blown.