ac not working properly and turns off on its own - JeepForum.com

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post #1 of 23 Old 06-04-2016, 12:24 PM Thread Starter
katiefran
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ac not working properly and turns off on its own

Hello, For 2 years I've had trouble with the AC button sometimes not going on and other times going off after I turn it on. If I turn the knob to vent it always works but not always on AC. It is getting harder to even turn it on. Any help gladly appreciate. It's a 2001 GC Lorado and when it turns on AND STAYS on it is nice and cold. I added 2 pictures of knob. Thanks

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post #2 of 23 Old 06-04-2016, 12:36 PM
MrRoundel
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You may have an A/C relay in your PDC in the engine compartment. I could be wrong about it though. To me, that sounds like it could be the problem, especially with the light going off when it gets funky. Good luck.

Last edited by MrRoundel; 06-04-2016 at 12:39 PM. Reason: Change to possibility of having relay.
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post #3 of 23 Old 06-04-2016, 01:04 PM Thread Starter
katiefran
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Thank you. So r u saying if I do have a A/c Relay it is bad and I need to replace it??
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post #4 of 23 Old 06-07-2016, 11:32 AM Thread Starter
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Is an A?C relay the same as a FUSE? Thanks
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post #5 of 23 Old 06-09-2016, 04:48 PM
WJChris
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no relay is a relay, a fuse is a fuse.

You could also potentially have low pressure in your AC system or a faulty pressure switch. Have a qualified AC tech check your system. You also could have a faulty AC button. The contacts wear out and the button itself could be failing. Good luck, as troubleshooting those require the tech to actually care. Most will just tell you to replace the entire AC control unit, which is also an option. They may be cost effective from a junk yard, or look up on here, there are many who regularly part our WJ's.
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post #6 of 23 Old 06-10-2016, 09:25 PM
Dan_in_MN
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Does your rear defrost come on when the AC button light goes out?

2000 WJ Grand Cherokee Black 233,000+ miles
Needs: Left rear wheel bearing. Front right CV joint.
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post #7 of 23 Old 06-12-2016, 09:02 PM Thread Starter
katiefran
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When the ac light goes out and the air isn't cold if I turn the knob to the defrost the light does come back on. Then if I turn it back to ac it goes out. Back to defrost back on.
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post #8 of 23 Old 06-12-2016, 09:04 PM Thread Starter
katiefran
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Also no I turned the rear on so u could see the lights. I changed the only fuse that said ac and problem still there. I never found info that said relay is there.
Also I am trying to avoid the cost of mechanic. Thanks
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post #9 of 23 Old 06-13-2016, 02:34 AM
PolkaPower
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Quote:
Originally Posted by katiefran View Post
Hello, For 2 years I've had trouble with the AC button sometimes not going on and other times going off after I turn it on. If I turn the knob to vent it always works but not always on AC. It is getting harder to even turn it on. Any help gladly appreciate. It's a 2001 GC Lorado and when it turns on AND STAYS on it is nice and cold. I added 2 pictures of knob. Thanks
Its possible the controls themselves are failing.
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post #10 of 23 Old 06-14-2016, 09:57 AM Thread Starter
katiefran
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Thank you. Is there a way to test the controls?
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post #11 of 23 Old 06-14-2016, 10:42 AM
Dan_in_MN
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Thinking about this a bit more, I'm thinking that the selector switch might need to be cleaned/replaced. Might be part of the control unit.

What you stated that the AC sometimes works and not at other times, lead me to this thinking.

2000 WJ Grand Cherokee Black 233,000+ miles
Needs: Left rear wheel bearing. Front right CV joint.
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post #12 of 23 Old 06-15-2016, 09:23 AM Thread Starter
katiefran
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Thank you Dan a mechanic told me the same thing. Without looking at it but by the symptoms. He said I might be able t even just take it out and file and clean and rust. If that is the problem it might be o.k. with a cleaning. I will see if I can find a video on how to take it apart. Thank again. Do you think selector switch is easy to get at?
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post #13 of 23 Old 06-15-2016, 09:32 AM Thread Starter
katiefran
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Thanks Polka
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post #14 of 23 Old 06-15-2016, 09:34 AM Thread Starter
katiefran
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Thanks for all the help. I am going to try and take it apart today and see if I can clean the selector knob control and hope thats the fix.
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post #15 of 23 Old 06-15-2016, 11:13 AM
Dan_in_MN
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Quote:
Originally Posted by katiefran View Post
Thank you Dan a mechanic told me the same thing. Without looking at it but by the symptoms. He said I might be able t even just take it out and file and clean and rust. If that is the problem it might be o.k. with a cleaning. I will see if I can find a video on how to take it apart. Thank again. Do you think selector switch is easy to get at?
I would highly suggest buying contact cleaner instead of using a file. There isn't a whole lot extra metal in switch contacts.

Be careful not to get it in your eyes. Use safety glasses.

Post up a few pictures of the switch before you clean it. I probably can tell if your switch is the problem.

2000 WJ Grand Cherokee Black 233,000+ miles
Needs: Left rear wheel bearing. Front right CV joint.
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