Jeep Wrangler 03 A/C stopped working abruptly

3 posts. the blower resistor, can be bad,
see your other anon posts. it was answered, with a schematic and free manual.

Heater blowing cold air,indicates towards low or no coolant or the coolant flow is getting obstructed or the heater core is clogged or hot to cold moving flap/ door is stuck in cold mode. There are many possibilities, that needs to be checked. Click the link below for step by step details:--- http://technoanswers.blogspot.com/2011/10/heater-blows-only-cold-air.html ---------- This should help.Thanks.Helpmech.

sounds like a broken door in the hvac housing

your heater hose or heater core could be plug, or your flap that opens inside of the heater housing may not be opening like it should. It operates off a vacum line, check all your vacum lines going into your heater housing.
good luck

Have you recently changed / or added coolants? your Coolant system may need to bleed.

this sounds like the recirculation door in the heater box is broken and this is a difficult and can be an expensive repair as the dash has to be removed for access. a quick check for this is if you release the glove box and let it hang you will see the heater box if you reach up to the left top you will feel a grid and the recirc flap is housed there you can operate the blower and hot and cold and see if flap moves

any time you do not have hot water in the hoses to the in side of the vehicle, your water has quit either due to you having only water in the system and it froze in the winter and you started it . or the propeller just broke of old age. make sure u dont have a check valve in the hoses going to the heater core in side the car. valve would be under the hood somewhere in the duration of one of the two hoses, which is the feed. this should do u good

junk it its not worth it one of the sensors that open and shut the door are bad

Tell the guy who fitted your radiator to finish the job, your cooling system needs bleeding

How often has the coolant been changed? My only guess is that it hasn't and the hoses and the heater core are plugged up with goo and a flush is needed