Issue with a/c clutch intermittently rotating with no power going to the compressor.

[deepseacruiser]

I recently removed the entirety of my A/C system to replace o rings and convert. The system is currently empty and I reinstalled the compressor to get the truck up and running while I was waiting to get some new lines made. While on a short drive I noticed a squelling noise coming from the engine bay and upon inspection noticed the A/C clutch was intermittently rotating with the pulley. There is no power going to the compressor in any way.

Does anyone have a clue what could be causing this?

 

[roscoFJ73]

Is the bearing seizing? If it is, you can replace the bearing.

 

[deepseacruiser]

Not sure haven't had a chance to remove and recheck. Haven't even had him to check this thread for replies...lol

 

[OGBeno]

Because no one comes here anymore for tech anyway.

 

[JuanJ]

Hello,

It might sound obvious, but the v-belt may be loose. Checking the tension is a good starting point.

A little grease on the bearing can help as well.

The magnetic clutch plays this trick when it is not properly lubricated.

Hope this helps.





Juan

 

[JuanJ]

Hello,

A little troubleshooting guide.






Juan

 

[fjc-man]

Is there an "air gap" between the the clutch and the face of the pulley? If you replaced the compressor shaft seal maybe you lost a shim. Should be approx. 1mm (don't know the spec.) gap.

 

[FJ73Texas]

My A/C clutch pulley seized up earlier this year (bad bearing). Thanks to @beno for helping me that day cutting the belt off.

NACHI bearing P/N: 40BGS12DS is what the clutch pulley uses on my Denso unit. No idea if that works for others.

 

[deepseacruiser]

Dang. Thank you everyone for the suggestions. I'll see if I got time to check it out this weekend otherwise gonna have to wait another week for another work trip.

Loose belt could be it. I installed see belts recently and have not gone back and retightened them after they've broken in.

I didn't do anything to the compressor besides remove and drain the old oil out before reinstalling.

 

[deepseacruiser]

Finally got a chance to check the compressor out. I replaced the bearing and there were 2 shims but there is still no gap. Parts manual show 3 different size shims

Does anyone know where to get the shims i tried ordering but they show discontinued everywhere.

On a side note beneath the hub was a small piece of felt and thin metal in between the bearing?

On a side note

 

[OGBeno]

88335-14020

 

[deepseacruiser]

Thanks beno!

 

[deepseacruiser]

So the gap or lack there of was the problem.

88335-14020

Unsure if the part number is correct and my compressor is aftermarket but the ID of the washers were to small. I carefully reamed them out to make them work though.