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Unread 06-11-2013, 03:59 PM   #1
MyJKU14
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A/C not that cold?

It hit 103 here today and my AC just hasn't been cold enough lately. It's more of a nice breeze. Am I just this intolerant of the heat or is my AC starting to go?

Facts on the kk:

08 Sport
92,000 miles
Routine maintenance done
Spark plugs changed last summer and fuel injector replaced.

Thanks buddies!

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Unread 06-11-2013, 04:10 PM   #2
tinktinkTJ
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Your a/c probably needs to be recharged.
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Unread 06-11-2013, 04:43 PM   #3
JSAN
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Best way to test is, to measure Ambient temperate then start your car, let it cool the interior for 5 minutes (Keep the windows up). Get the temperate reading from your center dash vent. Your dash vent temp should be ~40 degrees less than Ambient.


Your dash temp should be around 46-50F degrees

This is just general diagnostic, not specific to Liberty. Also it could be low on refrigerant or your Heater Core valve could be partially open. This would allow the blower blowing though the heater core as well.
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Unread 06-13-2013, 09:53 AM   #4
mrbeal
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Go to WalMart and get a recharge kit and hook it up. It's pretty self explanatory and you'll know in a hurry if you have a problem that needs to be sorted out. You probably either have a leak and recharging will help for a while or something is faulty and charging won't help at all. You could go to an A/C place and have them pressure test your system but it's probably cheaper to get the recharge kit at WalMart and try the fix yourself. I had bad A/C in my '93 Miata... R12 mind you... and I charged the system with R134a and my A/C blew ICE cold until I sold the car. Give it a shot.
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Unread 06-13-2013, 10:48 AM   #5
tjkj2002
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Fix the AC correctly.That junk sold at places like wallmart almost always have a stop leak in it which plays havoc with your AC system and a shops AC machine.A sure fire way to spend $1000+ on your AC system also.


A 30-40 degree drop in temp from ambient temp is about as best as it's going to get in most cases depending on humidity level.There also will be a difference in output temp from being stopped to cruising at 45mph+.The more airflow over the condensor the cooler the output air temps will be.
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Unread 06-13-2013, 11:25 AM   #6
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Apparently I just hate the heat. It's probably too much to ask that it blows out 20 degree air when it's 100+ out huh?! I'm going to take it by aamco though because they're advertising free ac checks right now. Thanks everyone!
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Unread 06-13-2013, 11:35 AM   #7
JSAN
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let us know what they find
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Unread 06-13-2013, 12:56 PM   #8
tjkj2002
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Quote:
Originally Posted by KK_Katie View Post
Apparently I just hate the heat. It's probably too much to ask that it blows out 20 degree air when it's 100+ out huh?! I'm going to take it by aamco though because they're advertising free ac checks right now. Thanks everyone!
The Evaporator would freeze if it blew out 20 degree air through the vents and the AC would simply stop working.The AC will shut off when the evap temp is close to 34-35 degrees to help prevent it from freezing.A low charge will cause the evap to freeze over regardless.
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Unread 06-13-2013, 08:13 PM   #9
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There are several TSB's on 08's

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Unread 06-14-2013, 06:24 AM   #10
BenHoleton
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Dave, got any links? Mine seems like it should be colder, too. I have an 08 Sport with 42k that I just bought
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Unread 06-14-2013, 10:30 AM   #11
Slayers
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Quote:
Originally Posted by mrbeal View Post
Go to WalMart and get a recharge kit and hook it up. It's pretty self explanatory and you'll know in a hurry if you have a problem that needs to be sorted out. You probably either have a leak and recharging will help for a while or something is faulty and charging won't help at all. You could go to an A/C place and have them pressure test your system but it's probably cheaper to get the recharge kit at WalMart and try the fix yourself. I had bad A/C in my '93 Miata... R12 mind you... and I charged the system with R134a and my A/C blew ICE cold until I sold the car. Give it a shot.
I would never try to do this.

Each a/c system has to be filled to a certain pressure and without having the proper tools there is no way to make sure you have enough.
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Unread 06-14-2013, 07:47 PM   #12
Dave_B
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TSB section top of the forum page
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Unread 06-15-2013, 07:46 AM   #13
BenHoleton
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Thanks. I often look at this on my iPhone and forget to toggle to the stickies tab
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Unread 06-16-2013, 11:01 PM   #14
ASK87
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Quote:
Originally Posted by mrbeal View Post
Go to WalMart and get a recharge kit and hook it up. It's pretty self explanatory and you'll know in a hurry if you have a problem that needs to be sorted out. You probably either have a leak and recharging will help for a while or something is faulty and charging won't help at all. You could go to an A/C place and have them pressure test your system but it's probably cheaper to get the recharge kit at WalMart and try the fix yourself. I had bad A/C in my '93 Miata... R12 mind you... and I charged the system with R134a and my A/C blew ICE cold until I sold the car. Give it a shot.

Agreed on this !

but make sure you will use a good brand like HoneyWell lets say ,

don't buy cheap gas , as it will Ruin your Compressor !

during charging the gas make sure your Cylinder is in Horizontal Position , ( Sleeping on a Side ) ,

Most of ACs require pressure of 30 psi , after you reach his pressure , hold on to that pressure for like 15 mnts , if pressure drops , then you Got a Leak , Charging Will do for a month or so , but eventually you should go pay your mechanic a Visit .
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Unread 06-16-2013, 11:21 PM   #15
ASK87
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Quote:
Originally Posted by Slayers View Post
I would never try to do this.

Each a/c system has to be filled to a certain pressure and without having the proper tools there is no way to make sure you have enough.
you are right slayer ,

each gas has its own density , using deffierent gas density would compromise your Compressor , Piping , Valves and other parts of the System .
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