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Username Post: A6 AC Compressor Clutch Engaged?        (Topic#366031)
scrambldcj8 
"3rd Year" Silver Supporting Member
Posts: 2663
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
08-06-21 04:27 AM - Post#2824614    

Hey everyone. I am putting this here because I don't know where else to put this.
I have an A6 comp on the SBC in my Jeep to be used one day for on board air. Last fall I finally put a belt to it. I did not notice until I ran it yesterday that the compressor clutch is engaged as I heard a strange pumping sound (rear intake/exhaust fittings have just been cut off so they're open), the comp is connected to a Painless Wiring harness (Jeep w/AC included in the harness) but not tied to any on/off switch at the moment. I have to check back and see if the circuit is in fact hot.
But onto question as I have not really looked into it, just went hmmph? And shut the hood......
.....The power lead is NOW UNPLUGGED but the clutch is still engaged and comp pumping air>>>>Why? I have not tried to "pry" the clutch to disengage it to see if it was Frozen in the engaged position.
I know, not much to go on but to summarize: why could the clutch engaged w/out electrical power being applied?

TIA for any leads I can follow. John



 


Mercedes 
Contributor
Posts: 359

Reg: 07-09-18
08-10-21 03:00 PM - Post#2824891    
    In response to scrambldcj8

If the compressor is running with no power whatsoever to the electric clutch then it is seized together. Probably rusty but you should be able to work it loose.

The only thing that drives the compressor is a friction fit when the compressor clutch engages a metal to metal contact surface. My guess is that rust has accumulated between the surfaces. Run some sandpaper between the clutch plates and free it up.



 
scrambldcj8 
"3rd Year" Silver Supporting Member
Posts: 2663
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
08-12-21 04:04 PM - Post#2825035    
    In response to Mercedes

Thanks for the tip....No electrical power at all....haven't had time to look at it but will have time over the next few days. Thanks!!



 
scrambldcj8 
"3rd Year" Silver Supporting Member
Posts: 2663
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
08-19-21 06:10 PM - Post#2825564    
    In response to scrambldcj8

I was able to pry between the clutch and loosen it. It did seem to want to spring back to being engaged. I will research how/if I can remove it while in the vehicle. Do you happen to know if pulley/belt assembly stays put while outer clutch comes off? If so, I can do your sandpaper trick. Thanks again.



 
Mercedes 
Contributor
Posts: 359

Reg: 07-09-18
08-20-21 05:28 PM - Post#2825623    
    In response to scrambldcj8

The entire clutch assembly can be removed from the compressor shaft and yes, the inner and outer part of the clutch can come apart.

That old A6 compressor was used by nearly every automaker out there, including Ford and Mercedes. There are plenty of free repair guides out there.

Take your time and enjoy.



 
scrambldcj8 
"3rd Year" Silver Supporting Member
Posts: 2663
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
08-23-21 02:42 AM - Post#2825756    
    In response to Mercedes

Thank you, and yes I've seen that comp used on other makes than just GM. I have started to browse some youtube vids....sometimes getting off track. Thanks again.



 
scrambldcj8 
"3rd Year" Silver Supporting Member
Posts: 2663
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
09-03-21 04:59 PM - Post#2826497    
    In response to scrambldcj8

Mercedes, you're spot on. I pretty much have it free without taking anything apart. A bit more sandpapering/clean up and should be good to go. Thanks again!!



 
Mercedes 
Contributor
Posts: 359

Reg: 07-09-18
09-04-21 04:50 AM - Post#2826509    
    In response to scrambldcj8

Glad to be of service. With the engine running, engage the clutch a few times, on and off, to make sure that it moves freely.



 


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