AC not real cold -
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post #1 of 9 Old 07-16-2014, 08:44 AM Thread Starter
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AC not real cold

My 2014 Unlimited's AC does not cool off to my satisfaction. I can get the temp in the vent down to 46 degrees. That sounds decent but my 4 other cars the temp in the vent gets down to 40, 39, 38 and 39 degrees. I know if I take it to the dealer their going to tell me that it's within their tolerances. Is there something I can do for this? A local mechanic checked it and said the system is charged properly.

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post #2 of 9 Old 07-16-2014, 09:21 AM
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It does sound like it is within specifications.
Why are you comparing the temperatures? Does it feel like it takes a long time to cool down the vehicle? Or doesn't it get cold enough? Do you have a soft top or a hard top?
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post #3 of 9 Old 07-16-2014, 10:50 AM Thread Starter
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I have a hard top on it right now. I have to run the fan on max the entire time with all the vents blowing toward me. This is annoying because of the noise and I haven't had anyone in the back seat yet so I don't know how uncomfortable it is back there. My 2004 Rubicon was so cold I ran that on the lowest setting. My 2013 Ram is also very cold. I had this problem with my 2004 Ram and after multiple trips to the dealer and local mechanics with no improvement I just suffered until I bought my new one.
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post #4 of 9 Old 07-16-2014, 11:07 AM
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A: no insulation. the cold gets out like the heat gets in.
B: expect about a 20-30 degree diff between in and outside.

07 Sahara Unlimited
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post #5 of 9 Old 07-16-2014, 12:21 PM
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My 2011 was much colder at the vents then my 2013.
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post #6 of 9 Old 07-16-2014, 01:10 PM Thread Starter
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I was thinking of getting the insulation panels for it. I understand about the 20 degree difference from inside to outside but why do all of my other cars drop the temp. more? They were all measured on the same day.
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post #7 of 9 Old 07-16-2014, 02:42 PM
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Mine gets 38-44 at the vent. My xj blows ice its 36f and i got it to 34.5 spraying water at the condenser lol. What is the ambient temp when you see 46 at the vents? Also if its real humid its less efficent, you could always recover a little out of the system so it doesnt even get 50 and take it in, they will recharge it. Could be over or under chanrged enough from the factory. A little makes a big difference when your only dealing with a pound or so. Also try 3/4 instead of full fan speed that will help and make sure its on recirculating air. I to noticed mine was not like my tj but its been 100+ out the last 2 weeks and blows nice and cool.
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post #8 of 9 Old 07-16-2014, 04:15 PM
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To test the A/C performance, operate the A/C system under the following conditions.

Engine at idle and operating temperature
Doors or windows open
Transmission in Park or Neutral with parking brake set
A/C heater controls set to Recirculation mode (max-A/C), full cool, panel mode, high blower and with A/C compressor engaged.

Here are the A/C output temperature ranges at various ambient temps.
The ambient readings at the left are the "feels like" temps which factor in the relative humidity.

Ambient Temp..... Temp at Center Outlets

70 F........................42 - 59 F
80 F........................45 - 64 F
90 F........................48 - 69 F
100 F......................52 - 72 F
110 F......................56 - 75 F

Some people have added a resistor in the evaporator temp sensor circuit to lower their A/C output temps.
You have to be careful not to go so low as to let the evaporator freeze up.

2008 JKU Rubicon
42RLE Auto
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post #9 of 9 Old 07-16-2014, 05:44 PM Thread Starter
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Wow, that's a big range. according to that i'm actually on the low end of the temp. range with my jeep. I'll have to look into the resistor thing. I'm also going to look into the roof panel insulation.
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