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Unread 07-12-2013, 02:39 PM   #1
RockyClymer
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AC quit!

Driving into Denver today and the AC just quit. I checked and the clutch on the comp does not lock in when AC light is on. Could not easily find the right fuse and do not have the manual with me. Any ideas to check before seeing a shop?

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Unread 07-12-2013, 09:09 PM   #2
jmb6420
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If you have gauges you can check your AC charge. Could be low, or the low pressure switch might be bad.

Fuse is:
ac-fuse.jpg

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Unread 07-13-2013, 09:15 AM   #3
RockyClymer
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Thank you, could not find that easily on the cover in the heat...will check it this morning.
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Unread 07-13-2013, 12:18 PM   #4
RockyClymer
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M15 is labelled as something else in my 08. Still looking for HVAC or AC fuse. M34 seems to have something to do with it.
edit: checked both fuses, all OK, got to be something else that up and quit.
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Unread 07-13-2013, 12:45 PM   #5
COLOUXJ
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I would try to jump the low pressure switch and get a reading on how much fluid you have in the system. Jumping the switch will tell you if your compressor is working. If you dont have enough fluid in the system it will not run either. Had an AC problem on my XJ and just gave up after awhile.
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Quote:
Originally Posted by cyberpyrot View Post
is it a plink plink kerrrrdunk? or more of a brrrrrconk doc doc miiiidge pang!!!? or is it a badonk ka donk? if it is the latter its just the normal fat *** of the JK

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Unread 07-13-2013, 12:51 PM   #6
jmb6420
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Quote:
Originally Posted by RockyClymer View Post
M15 is labelled as something else in my 08. Still looking for HVAC or AC fuse. M34 seems to have something to do with it.
edit: checked both fuses, all OK, got to be something else that up and quit.
You are correct, M34 is also AC related. I missed it. Both pics are out of my 08 manual.
jk-ac.jpg

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Unread 07-13-2013, 04:08 PM   #7
SubAtomicGenius
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****! Too bad, Rocky, let us know what you find out... not the right season for the AC to ****-the-bed!!!
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Unread 07-13-2013, 04:49 PM   #8
rirrgang
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A/C systems are designed to leak a little. The oil in the 134 keeps the bearings lubed and one in particular is the outer bearing near the clutch.
Buy a can of 134a re-charge and see if it helps. It's cheap and the easiest way to see if low pressure is your only problem.
Mine's a 07 and I've added a couple of cans over the years.
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Unread 07-14-2013, 12:29 AM   #9
Repauli1
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Quote:
Originally Posted by rirrgang
A/C systems are designed to leak a little. The oil in the 134 keeps the bearings lubed and one in particular is the outer bearing near the clutch.
Buy a can of 134a re-charge and see if it helps. It's cheap and the easiest way to see if low pressure is your only problem.
Mine's a 07 and I've added a couple of cans over the years.
Who told you they are designed to leak a little is full of BS, been in the industry for thirty years, new one on me!!!!
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Unread 07-14-2013, 07:37 AM   #10
rha600
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Even if there was a leak, it wouldn't just stop all the sudden would it?
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Unread 07-14-2013, 08:00 AM   #11
rirrgang
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Quote:
Originally Posted by Repauli1 View Post
Who told you they are designed to leak a little is full of BS, been in the industry for thirty years, new one on me!!!!
I'm happy to give you his number.
AAA Automotive Service
3030 Stanton St Ave
Springfield, IL 62703
I don't mean leak as in profusely leaking, I mean leak as in weep. So, you have never noticed a little oil behind the clutch on the compressor?
You are the expert and you must be right.
I've added two cans over 6 years. You think I have a problem with my A/C?
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Unread 07-14-2013, 08:08 AM   #12
COLOUXJ
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Quote:
Originally Posted by rirrgang View Post
A/C systems are designed to leak a little. The oil in the 134 keeps the bearings lubed and one in particular is the outer bearing near the clutch.
Buy a can of 134a re-charge and see if it helps. It's cheap and the easiest way to see if low pressure is your only problem.
Mine's a 07 and I've added a couple of cans over the years.
That is not the best way to see if you do not have pressure. Adding too much R-134 will do the same thing as having too little. They have ways you can measure without adding.
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Quote:
Originally Posted by cyberpyrot View Post
is it a plink plink kerrrrdunk? or more of a brrrrrconk doc doc miiiidge pang!!!? or is it a badonk ka donk? if it is the latter its just the normal fat *** of the JK

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Unread 07-14-2013, 08:14 AM   #13
jabsther
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i used to do HVAC years ago too.
One of the big culprits with car AC units is not running the compressor enough to keep the o-ring/seal lubricated. This is usually seen with oil by the compressor seal.
I had a slow leak on my old ZJ, added a can every other year. I believe it was called Stop Leak from Autozone. $25 can for 2oz. Not the 4oz cans.
Never added another can of freon again for the next few years before I traded it in for my JK.
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Unread 07-14-2013, 08:20 AM   #14
donny90yj
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Is your radiator fan working? Mine just went out (again....for the 3rd time) and the A/C doesn't work when it does. Easy test is turn the A/C on, the fan should come on as soon as you turn the knob. And an easy indicator is that your engine temp will be getting high when not moving.....
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Unread 07-14-2013, 08:55 AM   #15
rirrgang
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Quote:
Originally Posted by COLOUXJ View Post
That is not the best way to see if you do not have pressure. Adding too much R-134 will do the same thing as having too little. They have ways you can measure without adding.
My can came with a gage. I attach it to the proper port and the gauge shows whether or not I have adequate pressure.
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