(I included this in another thread but thought I should put in a separate one instead.)

I'm having a problem with a loud hard to describe noise, kind of like chattering noise, coming from the A/C compressor on a 2011 Ranger with a 4 L engine for just maybe two seconds when the A/C is activated, only the first time when the engine is running when it's cold out. I replaced the A/C clutch cycling switch since according to a Tech it had a problem but apparently it wasn't causing the clutch chattering problem. It sounds like it is being rapidly turned on and off for around two seconds, only the first time when it's cold out. After the 2011 Ranger sets for at least a day, as I recall, then it will do it again.

Do you know what a person need to do to fix it?

Thanks

 

I tried to edit my previous post but although it said I may, there was no option found.

I wanted to attach a sound recording of the noise so I will see if I can. It looks like it worked. You may need to turn up your sound.

 

How about posting a video where we can see and hear the compressor clutch when it is first turned on.

If this was my truck I would start by finding out if the compressor clutch is getting the proper voltage when you turn on the AC. also inspect the ground.

Once you know the power and ground is good and the Compresoor clutch still chatters ( kicks on and off ) on when you first turn it on then you will need to diagnose the issue.

I would remove the belt and spin the ribbed pully and listen for noise also try and wiggle this pully to see if it has play. you can also try and check for play at the clutch disk.

If everything sounds and looks good to this point you will need to measue the Air Gap between the disk and pully if the gap is excessive you may need to remove the disk and adjust the gap by removing one or more of the shims, it may be nessasary to replace the shim with one that is thinner if you only have one shim.

The specifications for the Air gap can be found in most service manuals.

Here is a helpful link to troubleshooting information which shows some of the tools you may need.

If this system has been serviced by a untrained person whom may have overfilled the system with too much oil, the compressor clutch can have weird problems like yours when it is first turned on. ( this information should be also in the link I provided )

http://www.cpsproducts.com/wp-conten...00A_manual.pdf

 

The clutch operates normally but makes the chatter/rattle sound as mentioned. This is a Ranger with only approximately 23,500 miles on it. So far, a Tech with an automotive degree just looked at it and determined the noise source and a Tech with an automotive degree and ASE certification checked the A/C pressures but it hasn't been checked for electrical issues yet.

 

According to an experienced A/C Tech, the A/C compressor makes a loud racket when turned on the first time when cold out because it is slugged by liquid refrigerant which forms in suction hose when cold. This is damaging to the compressor. The suction hose is too low in the system due to poor design!