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Old 05-16-2011, 01:04 AM   #1
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A/C compressor not engaging

2006 Wrangler X
40K miles
4.0l I6
6sp

A/C compressor not engaging.

The other day we had temps meriting the need for A/C and I found that the compressor is not engaging.

I do run the A/C once and a while during the winter to make certain the system remains tip top shape. I do not remember the last time the compressor was functioning. I'd guess late winter.

I spent a considerable amount of time reading and searching Google, JWF and other forums and came up with basic information which was only mildly helpful.

Things tested (with visual and DMM)

* Fuse panel inside "Silver"
* Fuse/Relay box under hood
* Removed dash center stack and checked switches and leads

Each of the above mentioned items have not been at fault as far as I can tell...

I've read about the Low Pressure s/w, but do not know exactly where it is on "Silver".
I've read about adding 134a....
I've read about testing for clutch activity on the compressor...

What exactly is the location of the Low Pressure s/w? (Pic's)

Are there any other points I've missed?

Is it uncommon for a Jeep so relatively new and low mileage to need a refresher of 134a?

C.

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Old 05-16-2011, 08:15 AM   #2
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Umm, does it have adequate freon in it? Did you check it?
Low freon level, aka a leak, will stop the compressor from running.

The low pressure switch on our 97 is mounted right on the Accumulator/receiver dryer.
Big silver sausage looking thing back by the fire wall.

High pressure switch is on the compressor.

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Old 05-16-2011, 02:31 PM   #3
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Thanks for the feed back...
Just getting in from business for the day and thought I could look some more at this situation.
Thanks Shelby427.... Lol! Part of the confusion is that I'm not certain as to what the Low pressure switch on the Accumulator looks like.... Do you happen to have pic's?

C.
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Old 05-16-2011, 02:33 PM   #4
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It's just a sensor with a connector and 2 wires coming out of it. All if does is open/close the circuit depending on the pressure.
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Old 05-16-2011, 02:39 PM   #5
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Ironically there seems to not be any wires or sensors on the metal canister at the firewall...at least with a basic glance...

C.
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Old 05-16-2011, 03:22 PM   #6
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I figured I'd help my cause by placing pic's at your view....
Here are some pic's of the engine bay of "Silver"(2006 X):











C.
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Old 05-16-2011, 05:24 PM   #7
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Anyone have any feedback?

C.
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Old 05-16-2011, 05:28 PM   #8
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Last picture, big a/c line, with the green plug, should be it on yours.

Still though I'd have the pressure checked first tell you right off if you have enough freon in there. After nearly 6 years, there's a good chance it is low.
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Old 05-16-2011, 05:30 PM   #9
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Thanks Shelby

I'm guessing then that the black cap below it is the area to check pressure of line and too add more 134a?

C.
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Old 05-16-2011, 07:36 PM   #10
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NOOOOOOO!!!!!!!!! That's the high pressure line!!!!!! LOL!!!

You add freon on the LOW side, it's the suction side. Follow your line with the sender on to find another matching black cap hook up. That's the one you want. LOW side lines going to the dryer will be the larger of the two.

Low pressure requires more room to move the contents, vs the high side line.

Just to be sure, the low side connection, when you remove the cap, will be a larger diameter then the high side one. The high side is used for checking high side pressure only.

When running correctly, low side will read around 32 psi, the high at least 150.

The tap you want is most likely down by the compressor on yours.
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Old 05-16-2011, 08:07 PM   #11
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If the compressor isn't running you may have a tough time adding freon. On the older models you could jump the terminals on the low pressure switch harness to get the compressor to run so you could add the freon.

But you have to be careful that you don't overcharge the system.

AND I DON'T KNOW YOUR SYSTEM, the switch harness may be exactly the same or it could use a different wiring set up, so I WON'T tell you to jump the harness.
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God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.
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Old 05-16-2011, 10:20 PM   #12
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Thanks.
I do appreciate your help. I think the confusion is cleared up with the s/w. I now have two seperate resources agreeing.

I'm uncertain as to the correct process of getting the compressor too engage with this year jeep.

C.

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