Loud fan noise, continues when car is turned off

There are a few possible reasons why your car might be producing a very loud, continuous sound that can only be stopped by disconnecting the battery. Some potential causes include:
1. A faulty starter motor: If the starter motor is faulty, it can cause a loud grinding or buzzing noise when attempting to start the car.
2. A malfunctioning alternator: If the alternator is not functioning properly, it can cause a loud whining or grinding noise.
3. A stuck fan belt: If the fan belt is stuck or has become worn and is slipping, it can cause a loud squealing noise.
4. A stuck horn: If the horn is stuck, it can cause a loud, continuous honking sound.
To determine the cause of the loud noise, it is recommended to have the car checked by a professional mechanic. They will be able to diagnose the issue and suggest the appropriate repairs. In the meantime, to stop the noise, you can try disconnecting the battery as a temporary solution. However, it is important to identify and fix the root cause of the issue to avoid further damage to the car.

Please take a look at your Engine's RPMs when this is happening and let us know, as it will help with the diagnosis. If the Engine RPM is stable (not high during the periods of the racing engine sound), then it sounds like your Radiator Fan clutch may be going out. The noise you are hearing is the fan kicking in and blowing a lot of air, which in turn sounds like the engine is racing.

If the RPMs are increasing with the racing engine sound, it could be the transmission/(clutch if manual trans) slipping.
Hope this helps!

Hello. I want to know more first, does it only make noise in motion or all the time?

-No.
-Make sure the battery is full and high CCA in order to be able crank at this cold weather.


Good luck


Mai

You may need to remove the blower motor and check for debris in the box, or a failing bearing on the motor.

It appears your fan itself burned out. When a field coil of an electrical fan burns out it usually makes a lot of smoke. The noise could be something that fell in there that stopped the fan from turning freely. I can imagine it heated up under the strain and burned out.

When you restarted it was burnt out so hence no noise and no fan.
The smell of the smoke should also be clue. Electrical field coils burning has an awful soury type of smell.

turn the key on and see if your fan or fans are running. if its fairly load the fan motor may be going out

1. Could be a caught foreign object between A/C (air conditioning) fan and cooling radiator, producing this loud noise.
2. Could be a damaged fan blade, mowing the cooling radiator.
3. Could be a loud noise comming from the fan's electrical motor.
4. Could be a broken off fin (small wing) of the cooling radiator, striking the A/C fan, producing this loud noise.

My first guess is a front wheel bearing is going bad.

If the noise going away every time u turning off the ac it's probably your ac compressor belt.however i will suggest to take some vaseline and rub it all over the exposed parts of your drive belt.