Betcha 20 bucks your AC system is low on refrigerant, causing the evaporator to freeze (ice-up), blocking the flow of air. I know this sounds counter-intuitive, but I have had this exact thing happen more than once.

Like @Mark_ says, don't try recharging it yourself, unless you know what you are doing.

 

Oh right... I had this happen with my Cherokee too. Ice build-up on a low charge. What I remember about that was... loud blower noise but hardly any air coming out of the vents. And then... I had ice chunks flying out of the vents (no s**t) ; family members were... impressed... Shut the system down for 10 minutes to let the ice melt (on the evap coil) and got the system to work for the rest of the trip. When we got back, had the system checked and indeed the charge was low (leak).

 

Hi there,

When you say 'Then, the air completely stops blowing but the AC system is still on', what does that mean exactly ? I mean how can you tell it is still 'on' if the fan stops blowing ?

One possibility with the air blowing strongly then weakly could be the system going from normal to recirculate, to normal, etc... Mine does that when it's really hot and it is designed to work that way. Recirculate allows quicker cabin cooling, and it blows harder than in 'normal' mode.
But you mention it stops blowing, which is never normal...

Either way, you'll need a dealership or competent A/C shop to look into this, these newer systems are not DIY-friendly, so don't even try to recharge it yourself..

 

Try using "AUTO" A/C mode. When in "AUTO" the system has a mind of its own. Try using the "AC" mode button. Adjust the temperature up and down. Change the fan speed. Has the cabin air filter ever been changed? One time I didn't sync driver and passenger settings and set drivers side to AC and the passenger side to HEAT, the poor HVAC system went crazy trying to fight itself. Check how you have set the Uconnect settings. I have a 2014 so 2019 may work differently. Refer to your 2019 Owner's Manual and follow the instructions. If some feature does not work according to how the Manual says they should work then go to your Jeep dealer and have them fix it accordingly.
And, my usual rant: get your battery tested for free someplace. I know from prior bad experiences that batteries do not like heat. The HVAC system puts a real strain on the battery and alternator. Personally I only recommend the X2 Power AGM battery from Batteries Plus Bulbs.
This is my attempt to improve battery life: Service Transmission light ON 2014 TH
Probably not necessary where I live, moderate temperatures all Year. Back in the last Century I would actually go to Phoenix, AZ in August, it was brutal.
My X2 Power battery goes out of its 5 Year Warranty period next week. Just had it tested twice and the CCAs are the lowest they have ever been, but still ok. I don't have ESS which is a great battery saver.
My other 'trick' is whenever I stop the Jeep I immediately open the engine hood to let the heat out.
When I am off road I always use the AC and never turn the engine OFF while I am out of my Jeep for any reason.
Once you turn the Jeep OFF it is a crap shoot if it will actually restart again.
This is my favorite stop for Indian jewelry: Gallup, New Mexico Trading Post: Tobe Turpen's Have you been there recently?

If a 2019 is your new Jeep then you must have bought it used. Have your Jeep dealer print a VIP report and review it with you. Look for any HVAC issues. Get a CarFax report for free someplace. Look for any old issues of concerns.

 

Thanks! I will try that.

 

Did you ever get it figured out HAVING THE EXACT SAME ISSUE

 

Hey @craigalbury,

Welcome from NY to the Forum! When this happens, open your hood and look at the two aluminum refrigerant pipes and the expansion valve and see if you see frost on them. (see photo below example from the V6 engine Cherokee. If you have the 2.4 or 2.0T the piping arrangement will be a little different but the expansion valve (circled at the rear of the photo) should be in the same place)

If so, you likely have a leak somewhere in the system and the refrigerant level is low. When this happens, you will see frost on the aluminum parts due to condensation and freezing of the moisture in the air. The evaporator (which is in your dashboard inside the car and responsible for cooling the cabin air) also is aluminum and as @Mark_ pointed out in his post above, eventually the frost will turn to ice blocking the airflow of the in-cabin A/C.

 

PS: Also, if you turn your Cherokee on "MAX A/C" does the problem go away (this bypasses any automatic temperature control however I'm assuming you're already using Max A/C, correct?)

 

My defrost will blow full blast , but when I switch to AC nothing blows out of my front vents. I still hear what should be air blowing, but I get nothing out if my dashboard vents!? Help