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Discussion Starter · #1 · (Edited)
Unusual, I think my AC Compressor is stuck on because the clutch won't disengage.

1. It's not on defrost
2. The AC green light is off
3. I'm getting cold air
4. I can feel the "drag" on the engine
5. the obvious spinning of the pulley and clutch engaged.

Question is: What is the best route to diagnose? Anyone else have this happen and figure something out?

Update: I see the compressor clutch is available to buy through rock auto, does anyone have a write-up or can send me any info on changing out the clutches?
 

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1997 Corolla
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What if you disconnect the wire from the compressor?
 

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1994 Corolla DX
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Hm, likely a problem with the magnetic clutch relay then... Try to pull it and see if the AC clutch disconnects. I think it's the one in the relay box next to the battery that says AC MG.
 

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Discussion Starter · #6 ·
Hm, likely a problem with the magnetic clutch relay then... Try to pull it and see if the AC clutch disconnects. I think it's the one in the relay box next to the battery that says AC MG.
I pulled the relay everything is still engaged and my AC will still turn on/off in the car. Looking at it just now I noticed quite a wobble I wonder if the bearing has gone. Would that lead to a lock up?

What if you disconnect the wire from the compressor?
Hard to see right now exactly what wire I found a grey connector single wire but I'm not sure if that was it or not.
 

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I pulled the relay everything is still engaged and my AC will still turn on/off in the car. Looking at it just now I noticed quite a wobble I wonder if the bearing has gone. Would that lead to a lock up?
It could cause problems. If you need to drive it and you're sure something is mechanically wrong with the pulley you should remove the belt, or if it's old cutting it off would be easier. You need to take the alternator belt off first to take the AC belt off, unless you cut it off.
Hard to see right now exactly what wire I found a grey connector single wire but I'm not sure if that was it or not.
Yes, the wire right under the alternator.
 

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Discussion Starter · #8 ·
It could cause problems. If you need to drive it and you're sure something is mechanically wrong with the pulley you should remove the belt, or if it's old cutting it off would be easier. You need to take the alternator belt off first to take the AC belt off, unless you cut it off.

Yes, the wire right under the alternator.
Yeah been there with the belts! I'm assuming that the clutch and pulley/bearing needs to be replaced, is that all possible without unbolting the compressor or am I going down the new compressor new accumulator route?
 

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I pulled the relay everything is still engaged and my AC will still turn on/off in the car. Looking at it just now I noticed quite a wobble I wonder if the bearing has gone. Would that lead to a lock up?
If the bearing is seized it will lock it up. But usually they get very noisy before that happens. You can test by disconnecting the battery to eliminate the electro-magnet as a source of trouble, remove the belt, and try to spin the pulley. If it doesn't freely spin the bearing has seized.

Yeah been there with the belts! I'm assuming that the clutch and pulley/bearing needs to be replaced, is that all possible without unbolting the compressor or am I going down the new compressor new accumulator route?
Yep, fully possible without unbolting the compressor. I replaced the bearing on mine: http://www.toyotanation.com/forum/1...ion-when-ac-clutch-engages-6.html#post7903250

For the bearing parts numbers: http://www.toyotanation.com/forum/1...ion-when-ac-clutch-engages-5.html#post7823545
 

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Plenty of room to get a socket in and loosen that bolt which secures the pulley. Then you can pop off the pulley - sometimes some light tapping from behind it will help it off.

Then you will need some snap-ring pliers to pull the clutch, but it's really just that simple.
Do you think you might've over-tightened the belt or something? Hopefully the compressor itself is still OK. I over-tightened mine, and fried both the clutch and the compressor. I got a compressor at the junk yard, and tried moving the clutch over, but it still was noisy, so I put the clutch back on the JY compressor and installed it, (also not very difficult) and charged it with products from Autostoned. I even rented their manifold and gauge set. It's still working fine some fourteen months later.

Here's my thread on it:
http://www.toyotanation.com/forum/130-7th-generation-1993-1997/1085361-7th-gen-ac-gurus-here.html
 
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Discussion Starter · #11 ·
Well wasn't too bad had to cut the wires off the new unit and connect to the previous connections as the ground was riveted to the compressor and the positive pigtail didn't match. Very easy no puller required just big snap rings. I also had to get a 1/2 inch smaller belt because the pully size must of changed. I ordered my clutch from Rock Auto. Here is what the old clutch looked like


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In a newer computer controlled car I would think the climate control is messed up. (I did have that in my sweeties Honda!) In these old beaters the clutch has probably welded it self together. Since the AC still works, replacing the clutch should solve your problem. Its just that replacing it IS A PROBLEM! You should be able to do the work without disconnecting hoses.

-SP
 
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