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Steve
Steve, Honda Mechanic
Category: Honda
Satisfied Customers: 3460
Experience:  13+ years with Honda,ase certified over 25 years
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Civic: We just replaced an ac coil and clutch on my 2009 honda

Customer Question

We just replaced an ac coil and clutch on my 2009 honda civic ex
Now the clutch is always engaged, need help
Submitted: 1 year ago.
Category: Honda
Expert:  Steve replied 1 year ago.
Did you just bolt it all together?
The clutch clearance needs to be set to 0.35-0.65 mm. This is done with the thin washers(shims) that should have come with the new clutch.
If the clutch clearance is correct you might have a sticking relay.
Customer: replied 1 year ago.
It has been shimmed correctly but there is 12v current to the coil even with the ac switch off
Expert:  Steve replied 1 year ago.
I must say that you have a sticking compressor clutch relay. It is one of the black relays in the underhood fuse box. Seems to be a common item to fail.
Customer: replied 1 year ago.
I bought a new relay and installed it and still is the same
Customer: replied 1 year ago.
What else could it be?
Expert:  Steve replied 1 year ago.
Did you try moving the relays around to be sure you changed the correct one? Let me look into it a little further for you.
Expert:  Steve replied 1 year ago.
If you remove the relay there should be no power at the clutch coil unless you have a short in the wiring.
Customer: replied 1 year ago.
The power to the clutch cuts off when the relay is out
Expert:  Steve replied 1 year ago.
The relay is grounded by the PCM. You should have 12 volts on 2 terminals in the fuse box and one should show an open if the ac is off. The other will show resistance because it goes to the clutch coil.
If you need diagrams I should be able to post some for you.
Customer: replied 1 year ago.
Yes please send diagrams
Expert:  Steve replied 1 year ago.
I will this evening. I can not send them here at work.
Expert:  Steve replied 1 year ago.
Sorry I got tied up last night but here are a couple diagrams that I hope help you out.
https://www.dropbox.com/s/aalzzebhp117ept/09%20CIVIC%20AC.jpg?dl=0
and
https://www.dropbox.com/s/h55ljau5wpikddq/09%20CIVIC%20AC.1.jpg?dl=0