Adding AC cooling fluid to AC wich line does it go in. It doesn't feel cold enough for all of this heat we are getting.

 

There are two sides to your A/C system. A high pressure side and a low pressure side. The only way you can truly return refrigerant to the A/C system is to take it somewhere that has an A/C machine that will recover the old and replace it with new refrigerant. This will also let you know if you have any leaks which can sometimes contribute to the feeling that you are not getting enough cold air out of your system. I know there is off the shelf ways to do this, but honestly it is a lot better to have it done at a shop somewhere than trying to recharge your system with the take home kits.

 

^^Well put. The problem with the auto part store cans is that you don't know how much refrigerant is already in your system or how much you are actually adding. Too much refrigerant can be a lot worse for your system than too little.

 

the other posts have it nailed pretty good... also it may be the computer that is your nemesis and not the A/C being low on 134a...

the thing about *ALL* air conditioning and refrigeration systems is that if it is truly low on gas there *IS* a leak... it may be small.. but that refrigerant goes around in circles and should never need 'topped off'...

to be low in a vehicle that is 3 years old or less is not normal... and from what ive seen in person these jeeps are known to have issues with the fittings around the compressor allowing them to leak....

the other thing is the air temperature from the vents in our jeeps is controlled by a thermistor connected to the computer... that thermistor is located in the evaporator coil.. Jeep doesnt let the coil temperature get down very cold before it cycles out the compressor... adding refrigerant to the system will not help you if thats the case...

overcharging is *BAD*.. (slugging the compressor is already an issue with these systems... too much slugging and bye bye compressor)

if you know what you are doing you can add just a tad at a time and try it.. yes the large line (smaller fitting) should be cold when the A/C is running properly....

so first thing start your jeep turn the A/C on 3rd fan speed, open the hood, let it sit for 5 minutes.. see if the large A/C line is cold.. (suction line.. it goes from the compressor to the firewall)..

if its cold, have someone rev the engine to 2500 RPM and see if it stays cold and watch the compressor to see if it kicks in and out at rapid intervals... if the line stays cold and the compressor only kicks out say every 20-30 seconds.. stays off for 5-10 and then back in (or stays in longer) then you likely are fine...

thats a *poor man's* way of checking an A/C and by no way takes the place of a shop investigation....

hope that helps you a little
-Christopher

 

Downshift and/or turn of the OD to keep your engine around 2500-3000rpm when using the A/C. Turn on the A/C MAX. See if the air is cold. The A/C doesn't seem to work well under 2000rpm.

 

Spray the mud of your condensor.(in front of the radiator) If You not getting good air flow your not removing the heat.

 

my A/C is wicked cold down to about 1000 RPM's.. (usually pushing 40-45 degree air from the vents on a 90+ degree day with top down and doors off)...

if you are having to rev it to get cold air it very well could be overcharged with refrigerant.....

-Christopher

 

Also be sure your fan is working properly (engine bay 2 speed fan)
at lower speeds or idle it is what pulls air across the condenser coil

 

Best thing to do for starters is get a thermometer and stick it in the vent to see what is coming out. AC units do not USE refrigerant unless they have a leak. Adding too much will cause the pressures to exceed normal and it will shut off and stay off. AC systems can build up to and exceed 300 to 400 psi. This is not for the inexperienced.

 

Thanx for the replys, I took it to the dealer and had them fix it.