First start it up and turn AC to maximum setting, if compressor is not kicking in you either are very low on refrigerant or have a power supply issue.
If it does kick in and air is not cold, then you probably just need to charge the AC, if your jeep has not be converted over to R134A already then that would have to be done first.
There could be a leak in your a/c system. Does your a/c compressor engage when the a/c is turned on? To check, locate the compressor, its a big cylinder on the serpentine belt, you should see the wheel engage(spin) and disengage(stop) when the a/c is activated. If it doesn't move, then your compressor is bad. If it does move, then there is a leak in the system that will need to be repaired.
The AC compressor looks like this:
http://www.partsgeek.com/gbproducts/MC/2226-07026167.html?utm_source=google&utm_medium=ff&utm_term=1991-1993+Jeep+Cherokee+A%2FC+Compressor+Four+Seasons+57632+91-93+Jeep+A%2FC+Compressor+1992&utm_content=MC&utm_campaign=PartsGeek+Google+Base&fp=pp
SOURCE: 2005 jeep grand cherokee ac blows cold only on drivers side
I agree, these vehicles have a problem with the blend doors and since the accuators hit the door when it opens and closes, it breaks the doors. and it's a huge job to replace them.
SOURCE: Jeep AC blows cold air at defrost and feet but not through vents
There is a flap that directs the air. the flap is controlled by a vacuum actuator. This is located inside the venting. The actuator is connected to little vacuum hoses that attach to the temperature control switch. Either the flap is stuck, or the actuator has gone bad.
SOURCE: '00 Jeep Wrangler with no heat and AC not blowing
Ok, if you are trying to use your AC and its not turning on, odds are your refrigerant levels are low, the system will not turn on when low fluid levels are present so the system doesnt burn up the compressor.
If your blower motor is not operating, you may have a fuse blown that needs to be replaced, or the control chip that plugs into the blower motor (for fan speed settings) has burned up (easy fix).
If your climate control is not throwing out heat when you change the settings to hot, you have a leaky vaccume line and the vaccume pressure is not strong enough to open or close (depending on setting) your blender box. Although typically when a vaccume line springs a leak you will have issues with your selector switch as well (defrost, vent, floor)
Also pay attention to your temp gauge to make sure the thermostat is operating properly, and the engine is not over heating ro getting excessivly hot! If it is, then you need to replace the thermostat ($8 part)
and go from there. Also you should check your heater core, if it gets clogged or has restricted coolant flow, your system wont have the heat it normally did (if any) when it worked properly.
This is just a quick summery of the area's you should be looking into for the problems you are having! thanks for using Fixya.com and good luck, I hope I have helped make resolving your problem alittle easier
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