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post #1 of 11 Old 08-04-2020, 09:53 AM Thread Starter
territory145
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A/C Compressor

Hi all,
Newbie here with a new to me 2006 Liberty LTD.
The A/C compressor is always on EXCEPT when I remove the large black fuse in the fuse box under the hood.
If I leave the fuse in overnight the battery is dead in the morning. When I reinstall the black fuse under the hood the compressor clutch moves to the on position?????
How do I fix this problem.
PLEASE

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post #2 of 11 Old 08-04-2020, 10:20 AM
RussB81
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Look at the accumulator and make sure the low pressure switch hasn't been disconnected and jumpered. If that is good try a new relay.
Did the last owner wire the compressor to always be on? I've seen that before.

'04 KJ
'91 XJ, government fleet model with 0 options, 2 wheel drive, 4 cylinders, and 5 speeds
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post #3 of 11 Old 08-04-2020, 11:00 AM Thread Starter
territory145
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Thanks RussB81
Where do I find the relay to replace it?
Mitch
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post #4 of 11 Old 08-04-2020, 02:03 PM
RussB81
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The relay should be at any auto parts store. Just take it in and they will find one that works. You can also pry the black cover off your relay and check it to see if the contacts are messed up before you go buy another one.

'04 KJ
'91 XJ, government fleet model with 0 options, 2 wheel drive, 4 cylinders, and 5 speeds
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post #5 of 11 Old 08-04-2020, 03:13 PM Thread Starter
territory145
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a/c

Hey Russ,
I went to advanced auto parts and bought a new relay. I put it in the slots under the hood and it didnt work. The one I took out is the only one that will work. I tried other relays from the box under the hood with the same numbers on it and they dont work either????
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post #6 of 11 Old 08-04-2020, 03:22 PM
jtec
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Did you ask where on the jeep is the AC relay?
Attached Thumbnails
AC relay in underhood fuse box.JPG  

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #7 of 11 Old 08-05-2020, 11:18 AM
RussB81
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So, I'm thinking the old relay is definitely welded shut forcing the compressor on. That relay is bad. The reason the compressor won't cycle with the new relay is because you might have a problem elsewhere. Is the AC switch pressed in on the panel? Put the new relay in, and then take off the connector from the pressure switch on the accumulator. Insert a little wire to jumper the contacts and the compressor should kick on. If it does then you need to add R134 to your system assuming you don't have any leaks.

Don't use that "stop-leak super-cool" kind of R134 in the flashy can. That stuff clogs your orifices. Use the plain can R134 that is cheap. R134a is a highly regulated formula and works best without the additives and marketing.

And relays are relays. There are two basic types. Always open or always closed. The AC relay is an always open, and the 'on' signal makes the contacts close.

'04 KJ
'91 XJ, government fleet model with 0 options, 2 wheel drive, 4 cylinders, and 5 speeds
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post #8 of 11 Old 08-06-2020, 12:54 PM Thread Starter
territory145
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Hey Russ,
I had the accumulator changed and now it seems to be working fine. I'll keep in touch. Thank you very much for the very valuable knowledge that you shared with me, I owe you.
Mitch
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post #9 of 11 Old 08-11-2020, 06:29 PM Thread Starter
territory145
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So, the compressor is leaking and thats why its not working after a few days. Getting the compressor changed out tomorrow. I'll let you know how it goes. Thanks everyone, especially Russ.
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post #10 of 11 Old 08-12-2020, 09:42 AM
RussB81
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Yeah man. I try to go after the compressor itself last if it is spinning and working.

'04 KJ
'91 XJ, government fleet model with 0 options, 2 wheel drive, 4 cylinders, and 5 speeds
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post #11 of 11 Old 08-13-2020, 08:30 AM Thread Starter
territory145
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It only spins when there is enough freon in the unit, as soon as it leaks out it stops.
Thanks again
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