2004 ford expedtion, when a/c clutch is engaged the clutch or compressor is very loud, a/c works great but loud noise coming from compressor, could there be a bad bearing in clutch, can i remove clutch to troubleshoot problem?

Only way to know for sure (is to check system with AC pressure hoses attached. Oh, and check that compressor clutch is engaging and disengaging as it runs( loud clicking noise on compressir and clutch disk spins)

Get out your owners manual and locate the power relay for the AC and remove it, this will stop the AC clutch from engaging the compressor, note, AC is used in winter to help remove moisture when defrost is on you may have to roll window down to prevent fogging, also check for blown fuse in manual bet you find one for instrument cluster, good luck,Bret

Your compressor could be faulty. Check to see if it engages when you press the AC button with the car running.

Air conditioner clutch is going bad and needs to be replaced.

Yes, it could be the ac clutch or the compressor itself.

Hello, This could be an indication your A/C is low on Freon or your Power Steering pump is low on fluid. Both systems are made to increase the idle speed to make the system work better. What happens in the case of the A/C, is the A/C compressor puts a strain on the motor when it engages the electric clutch on the compressor.

The A/C is wired such that when the compressor clutch engages, the engine RPM is increased to maintain the idle speed. The controls do this automatically and when your compressor is low of Freon, there is little resistance and the engine overspeeds. You are burning up your compressor if you lose the lubricant packaged inside it. That noise you hear is a dry compressor.

Turn your A/C or Defroster off and see if the overspeed and the noise stop. The compressor will run in the Defrost cycle too! Eventually your A/C will lose more of the Freon until the low pressure switch cuts the power to the compressor completely.

Some front wheel drive cars have a boost sensor in the power steering assembly for increasing the idle speed when you are turning the steering at low speeds. If the fluid level is low, it tricks the sensor into speeding up the idle to assist steering. Like in the A/C example, you can get overspeed when the fluid levels are low.

I hope my solution is very helpful in fixing your problem. Have your Freon checked or throw in an "OIL Charge" with the proper type of oil for your compressor. Then check your Power steering.

maybe. The compressor uses an electric clutch on the front to engage. when it engages, you should see the inside of the pulley start turning. With the clutch off, the pulley turns but not the inside. If the clutch is clicking but not engaging, it will have to be repaired with special tools.

That is what happens when you try to shift gear with out depressing the clutch pedal while changing gears.

Yea definitely look at if you actually are full of Suva/R134a ( Freon isn't used anymore ;) )

And you are sure the compressor is engaging? You visually see the clutch compressor spinning?

Are you sure its not under/overcharged? It may have pressure switches to protect it.

If it is engaging, does it make any weird noises?

A/C -Heater controls
Has you are aware the A/C Clutch compressor is engaged at all times when the defrost mode is turned on. Turn off all heater controls. If the noise is gone it will be either the Air conditioner compressor clutch bearing or possible the idler pulley bearing .
The Warden