The Freon probably needs to be recharged. Any repair shop should be able to do this. They should also test the system for leaks to see why the Freon leaked out to begin with.
A vehicle air conditioner has two basic components; the compressor, and the fan, or blower. If the compressor is working, the air coming out of the vents will be cold, but if the blower is not working, the air will not come out very fast. Hot wire the blower to the battery, to bypass any fuses or switches, and see if the blower will run. If it does, but will not run when connected normally, check the fuse for the blower. If it is good, you would be wise to take the vehicle to an automotive electrical specialist to have them troubleshoot it.
If you have no air coming out of the vents then you need a new blower. If you have air but no heat its either the hot cold selector not moving the flap or its the heater matrix. First things first. Check the fuse for the blower (if you get no air). Everything except the fuse need a mechanic or very keen DIY expert with a Haynes manual to hand.
You're blower fan isn't working at all, but when you're driving air will still come in through the vents. Obviously, the faster you go the more air will come in. If you're just parked, no air will come in. Check you're fuse, blower motor, relay, switch, and resistor. It could be any of those. Sorry I can't be anymore specific. I'm just basing this on what you described.
Check blower motor fuse Blower motor resistor pack? Fan switch? Selector switch? ---- Is the Blower Motor Working? I'm not sure if the question is that the blower motor is working and "no air is blowing thru the vents'! If the blower is working and no air is blowing thru the vents then you could have a broken Recirculation Door. That is another common heating problem with the 99/04 Jeep GC. The recirc door brakes and falls down blocking the blower which will reduce or block the air flow completely. Normally the dashboard would have to be removed to replace the broken recirculation door. See the Link below for a NO Dash Removalrecirculation door fix. ----
NO never close off your cold air return.this causes the blower fan to "starve" for air reducing the units efficiency. it may feel like cold air is coming out of the registers,but in-fact the cold air is being pulled into the register from the room so it can be heated by the unit. hope this helps..... HVAC tech.
That's nice. I'm guessing you want to fix it now?This can't be done until you do that essential first step - diagnose the problem. HOW is it not working? Is it just not delivering cold air, is the blower motor not working, is air not coming through certain vents, is your AC compressor clutch not engaging and/or disengaging?You might be getting in over your head trying to do it on your own - AC systems really aren't a DIY task to begin with. If your blower is blowing air, I'd recommend you take it to a shop to have a system performance test done. That'll help diagnose what the problem actually is. "AC system not working" is far, far, far too vague for any accurate diagnosis to be given.
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