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2006 Jeep Liberty compressor not engaging


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96Cobra
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Jun 26, 2012, 10:26 PM

Post #1 of 9 (4088 views)
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2006 Jeep Liberty compressor not engaging Sign In

Hello all, here's the vehicle details: 2006 Jeep Liberty, 3.7L, 134,439 miles. This is my friends vehicle, and she told me that the AC wasn't working, and hasn't been blowing cold air in sometime. She also told me that someone tried to recharge the system (not at a shop) but that it didn't work, about a year ago. Here's what I've been able to figure out: the magnetic clutch on the compressor is not engaging. All of the wiring appears to be in good condition, no burnt wires or frayed ends, no corrosion that I saw on any of the connectors. All of the components of the AC system appear to be in good condition. I hooked up a pressure gauge to the low side with the engine off, and with the engine on with the AC on full, and in both cases it read 0 pressure. I'm having a hard time trying to figure out what's wrong given the amount of possibilities there are. My thought was that the compressor was not kicking on because there was not enough refrigerant in the system, probably due to a leak. However, the when I attempted to add R-134a with dye, onto the low side, it would not take any in. Any thoughts on what I should look to next?


nickwarner
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Jun 26, 2012, 11:02 PM

Post #2 of 9 (4071 views)
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Re: 2006 Jeep Liberty compressor not engaging [In reply to] Sign In

I next thing I would do is stop now before you break something very expensive. You said you are only reading the low side, so I'm guessing you have the little fake gauge that came with the can and reads red, yellow and green. Thats not going to cut it at all. You need true gauges on high and low side. Did the 134 you've added have leak sealer? If so you just did at least $1000 in damage that didn't need to be done. Its called a Death Kit by those of us in the know. I see no mention of using a vacuum pump to place the system in a vacuum prior to your attempt to charge it and you have not replaced the dessicant either so if you somehow get any 134 in it you will create hydrofluoric acid just from the humidity in the air it comes in contact with. Please read the threads locked at the top of this section before doing anything else but I strongly urge you to proceed no further than the nearest AC shop and get an estimate.


Sidom
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Jun 26, 2012, 11:22 PM

Post #3 of 9 (4055 views)
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Just to echo what Nick has already said......You have to start off with the zero pressure......Obviously you have a leak that needs to be found....
That would start off with getting some refrigerant & dye in the system.....If there is a problem with the service port, then that would need to be addressed 1st.
You do want a pro set of manifold gauges, to accurately diagnose the system we would need both high & low reading..

Also for your own safety, you want to know what the high side is doing. Certain malfunctions can cause very high, high side reading.....Without know where the high side is on a running system, you could seriously hurt yourself or someone else






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96Cobra
New User

Jun 26, 2012, 11:34 PM

Post #4 of 9 (4048 views)
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Thanks for the replies guys. I do have access to a set of real gauges for HVAC, but I didn't have the correct adapters for automotive use, but I did have one of the cheap adapter hoses that only hooks onto the low side so that's what I used. None of the refrigerant went into the system, the bottle is still completely full, but you're correct, the system was not placed into a vacuum before that. My friend doesn't have any money to spend on it, so I was just trying to get an idea of what was wrong without investing too much of my own money. Maybe the best thing to do would be to take it in though.


Sidom
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Jun 26, 2012, 11:42 PM

Post #5 of 9 (4042 views)
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If you don't have a manifold set that will work, that might be the best idea. It's very possible the system is full and that the little gauge just isn't reading the static pressure and it's an electrical problem....

Gotta start with an accurate static pressure reading and depending on what you get will determine which direction you go next...






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Hammer Time
Ultimate Carjunky / Moderator
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Jun 27, 2012, 6:35 AM

Post #6 of 9 (4023 views)
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Quote
I do have access to a set of real gauges for HVAC, but I didn't have the correct adapters for automotive use,


That would mean that they are R12/R22 gauges and not R134A as required for this car.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
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Jun 27, 2012, 7:10 AM

Post #7 of 9 (4019 views)
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If good R-12/R-22 gauges a set of three hoses with adaptor fittings and the legal end shut offs are readily available. If your current set isn't in good shape it's time for proper stuff. Low end real gauges seem OK for limited use and not way too expensive,

T
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Long retired now


johnbkobb
Novice

Jul 5, 2012, 3:22 PM

Post #8 of 9 (3934 views)
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(This post was edited by johnbkobb on Jul 10, 2012, 7:02 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
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Jul 5, 2012, 3:28 PM

Post #9 of 9 (3926 views)
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NO! We don't know that yet at all,

T
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Long retired now




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