2000 jeep wrangler a/c wont work

Was the servicing done properly? A too low pressure will prevent the compressor to kick in. On your jeep i believe that a too high pressure will do the same ( later models use a temperature sensor in the evaporator)

you have a bad blower resistor

check the driveshaft end joints (check when not in tension) and check for excessive play in the differential yokes. Aside from up and down play make sure they do not turn excessively before wheels begin to turn. If you find no problems there then you may have a transfer case problem. End joints fail far more frequently than do transfer case internals or differentials (unless you run them low on lube) So it's a good idea to check them before worrying about large items.

The blower resistor has failed. the resistor is located under the dashboard on under the glove box. below the blower to the lower left side you will see the resistor which is approx 3" in length x 3/4" . it will have atwo mounting hex screws holding it. tight conditions. unconfortable to reach. Rsistor can be purchased at auto parts store approx $25

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

replace switch

Replace the blower motor resistor. You can unplug the fan till you get one. Usually located behind the glove box.

if this is happening while the selector is in defrost mode it normal... if it happening while in any mode other than defrost or a/c then check the compressor relay or control head

This may be the AC compressor cycling switch is defective. It is located in the larger of the 2 AC lines coming from the compressor, it has a wire connector to it with 2-3 wires. To verify this is the issue jumper the connector with a small piece of wire and see if the compressor runs.

may be a pressure switch. that will keep the compressor from kicking in.