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Jeep Liberty Air Cool not Cold
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murdoc
New User
Jul 10, 2023, 5:46 PM
Post #1 of 6
(1480 views)
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Jeep Liberty Air Cool not Cold
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2009 Jeep Liberty KK 3.7L 150k miles
I had a compressor go bad on me a few months back, so I've been living with no Air Conditioning until I got the money to replace it. Out of an OVER abundance of caution, I replaced everything! The evap core, all three hoses, compressor, expansion valve, and condenser with drier.
When I got the new compressor I drained out the factory oil that it came with. It said it came with 4.4 oz. I for sure got 3oz out into a cup, and probably spilled another oz on the ground. I then carefully added new oil mixed with dye. About 3 oz to the compressor and 2 oz to the evap core. ( The new compressor instruction said to add half to the compressor and half to the rest of the system)
I carefully vacuumed down the system and it held at -29 psi for over 12 hours (got distracted by dad duties). Then attached the Freon (yes it was "Freon" brand R-134a) to the system. I purged the line, and then opened the low side and let the can fill the system with the engine off until it equalized. Then started the car and added the rest of that can, and 6 oz from the next can. That should be 18oz total, which is what the system sticker in the engine bay says it needs.
So here's my problem. With the ambient air temp at 83 degrees F, air conditioner on, fan on high, recirculation on. The air in the center vent only measures about 53-55 degrees F. According to the shop manual, it should be around 45 degrees at that ambient temperature.
Since there was some Freon left in one can, I added that as well. Now the system has about 20 - 22 oz in it, and still has the same
With the engine running, idling, and fully up to temperature, the pressure on the low side reads 30.5 PSI. The high side reads 170psi. These seem low. If I'm reading the Factory Repair and Service manual correctly, the pressures should be 27 - 37 PSI on the Low side and 225 - 325 PSI on the high side. So it seems a little low, right?
Not sure what to do here. From everything I've read it seems the most likely thing I did was add too much oil. I'm not sure what to do from here. Try adding more Freon? How much damage can overcharging the system cause? If I take it to a shop to evacuate and recharge the system will that remove the oil I put in? Kind of a moot point though as shops want $200 - $260 for the service and I don't have that cash right now.
Any input or suggestions would be GREATLY appreciated!
Oh, and I forgot to mention that with the engine off and cool, the pressure in the system is equalized on both sides, and is about the same as the ambient temperature.
Thanks!
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 10, 2023, 6:54 PM
Post #2 of 6
(1468 views)
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Re: Jeep Liberty Air Cool not Cold
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No, definitely don't add more refrigerant. That's the fastest way to total grenading the system. I might even bleed a little off. More does not mean colder.
If you are getting 53-55 degrees at idle on high blower, you are just fine. It will cool further driving down the road as the recirculated air cools down. It has a thermostat in the evap that will shut the compressor down if the temp gets too low.
It will take a little while for the oil to spread through the system.
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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.
(This post was edited by Hammer Time on Jul 10, 2023, 6:56 PM)
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murdoc
New User
Jul 10, 2023, 7:29 PM
Post #3 of 6
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Re: Jeep Liberty Air Cool not Cold
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Thank you. I'll bleed off a bit and drive it for a week or so. Hopefully that helps. Supposed to be hot this week.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 10, 2023, 7:34 PM
Post #4 of 6
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Re: Jeep Liberty Air Cool not Cold
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Hahaha........... you're in Ohio. Come down with me in South Florida in July if you want to see hot.
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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.
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murdoc
New User
Jul 10, 2023, 8:09 PM
Post #5 of 6
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Re: Jeep Liberty Air Cool not Cold
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I'll take a pass on that. The only time you'll catch me in FL is January and February.
So, a person on another forum suggested that I take readings with the engine running at 1800 RPM for 90 seconds. So I did. Below is the results. Not sure what this test is meant to show, but I thought maybe the more data the better and I'd post my results here as well.
Engine warmed up fully. Ambient air temp 81% Humidity 51% - Sun is down:
After holding at 18-1900RPM for 90 Seconds--> Low side = 25psi High Side = 225psi and Vent Temp is 57.5 - 58 Deg F.
Immediately after that test, at idle--> Low Side 32psi | High Side 180psi and Vent temp is 60.5 Deg F
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 10, 2023, 9:41 PM
Post #6 of 6
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Re: Jeep Liberty Air Cool not Cold
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I own this exact vehicle, NOW! That's all it will do it's been 100F where it's parked, color of thing is Black can cook in it. It's lots hotter than
Florida ever gets 100% sun, black car. Can cook in it.
It has electric fan not optional fan clutch idea. holds 17.9 oz 18 should be close enough.
It's NOT hot in Florida compared to here not COLD either in Winter! The performance is all about actual air temp, humidity involved so your results of some real 50sF outputs are on target IMO I watch 100% with a digital thermo am an A/C nut college trained in heat transfers not just some fool thing which Jeeps are! A failure but love affair.
The pattern failure is evap leaks no refrigerant means dry of oil compressor fails take out system.
I need an ounce and that low (my vehicle) scared to mess it up as it works predictably just 2.5 years owed has just 73K on it.
If you want an ice box, freezer Mopars are the wrong vehicles if it drip condensate it's probably all it will do.
OMG this company has been bankrupt more than any human can count what on earth do you expect? Same company make a Gremlin need I say more same in-bred builders, engineers or must be. BTW of 100s of cars I've had it's fun!
Love snow then ice building up between spare out back and swing tailgate can't open it or if so can't close it! How special and still like it??
Raining here big time not unusual love 4X4 not needed it sprays water, dirt all over itself can't see stop and clear off debris and is "trail rated???????????" for what? A dry, groomed dirt road in Montana in July perhaps?
Tom :-) in good fun!
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