Jump to content

A/C Unit Wont Disengage

Recommended Posts

Hello All,

My 72 510 wagon's ac unit is recharged as of recently and now im running into some problems with it. Since the AC unit wont disengage its leeching my hp badly. Its also making the engine run much hotter than it should. 


Do you guys have any similar experiences or suggestions? 


NOTE: I unplugged the control wire (Not sure if thats the technical term for it) from the A/C while the car was running (AC also in off position from the dash) and the problem continued to persist. 

Link to comment
  • Replies 2
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

What type of AC compressor do you have? The old box-shape York piston type or maybe a large rotary? With those the center part of the clutch should stop turning if there is no electrical power to the clutch (AC switch OFF or wire to the clutch unplugged). I believe with the engine turned off you should be able to rotate the center part of the clutch by hand. There will be some resistance to turning if you have a good charge of coolant in the system. If there is no electrical power to the clutch and the center turns when the engine is running, the clutch is dragging and needs replacing. These can be replaced without removing the compressor or losing the AC charge. There is something I'm vaguely remembering about too much coolant in the system causing clutch problems, but maybe that is one of those false memories I keep having.


However, there is the newer small style rotary compressors which I know little about. Somehow I got the idea those type of compressor clutches turn all the time the engine is running.  They don't kick out like the older style clutches. I'm sure someone will correct me on that one if I'm wrong.


If you can post a pic of your compressor it would be good.



Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.