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Discussion Starter #1
Drove the car 8 hours today, had to travel for work, and about halfway through the trip, I noticed that my A/C wasn't working. I could hear the fan blowing, but nothing was coming out of any vents. I tried switching over to manual, but repeated setting changes failed to restore function. Even setting the system to recirculating internal air didn't do anything, so it's not that the intake is blocked. Something inside the plenum isn't opening to allow airflow. Eventually, after shutting the car off a few times, something shifted enough to allow at least some air, but even with the fan on Max I'm only getting a gentle breeze through the dash vents and it comes out of some vents more strongly than others.



Has anyone else seen this? Does anyone know what door is the likely culprit, and is it something I might be able to reach and free up? I'm on the road until Friday, so I can't drop it by a dealer for a warranty repair that might take days to diagnose and get parts for.
 

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Discussion Starter #3
Could be a bad actuator. Not sure if there is the HVAC module has a self diagnostic test that can be without a dealer scan tool.

Thanks for that. The doc you included says any problems will store a code, and IIRC there is a way to see diag codes in the dash display, so I'll look tomorrow to see if the system recorded any issues.
 

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Thanks for that. The doc you included says any problems will store a code, and IIRC there is a way to see diag codes in the dash display, so I'll look tomorrow to see if the system recorded any issues.
Not sure if a generic scan tool can pull the code as it is stored in the BCM but worth a try. On my old JGC you could access the codes through the HVAC module but I don't think it can be done on the +2015 challenger models, although I never really looked into it. There are tests you can do by pulling connectors and testing voltages but it's pretty lengthy. Check out the online chiltons manual through the link below. I think it is the same as in the sticky in the maintenance section.

https://www.roswell-nm.gov/1112/Chilton-Auto-Repair-Library
 

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Does your car have a cabin air filter? I've seen dirty filters greatly reduce air flow on other vehicles.
 

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Discussion Starter #8
Does your car have a cabin air filter? I've seen dirty filters greatly reduce air flow on other vehicles.
That was the first thing I thought of. I checked it two ways: first, I tried to switch over to cabin recirculation, which shouldn't be trying to pull air in from outside, and then I physically checked the filter, which looked fine.


As it happened, this morning, everything seemed to be working fine, and when I went into the dashboard system and had it check diagnostic codes, there were no codes showing. I should have thought to check yesterday when the problem was occurring to see if it was a transient code that cleared itself later. I'll have to keep an eye on it and make a point of checking the diag codes immediately if it happens again.
 

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Not sure if this is any use to you, but i had the same thing happen with my 2013 Caravan. I haven't gotten it fixed yet, but i have found a work around.

When it happens while driving, turn off the AC, turn the temp controls to mid position, and turn the fan speed to mid. After about 10 minutes, operation should return to normal. At least it does in my situation.
 

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Discussion Starter #10
Problem identified. In my case, the humidity sensor has an intermittent short. When it works correctly, the A/C functions as normal. When it flakes out, the various doors inside the plenum stop letting cool air into the cabin. Since I'm about to move to Houston, having a functional humidity sensor is going to be fairly critical, so it's on order at the dealer, and should be in tomorrow. Install takes about an hour (probably less, but the "book" will say an hour I'm thinking).
 

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Problem identified. In my case, the humidity sensor has an intermittent short. When it works correctly, the A/C functions as normal. When it flakes out, the various doors inside the plenum stop letting cool air into the cabin. Since I'm about to move to Houston, having a functional humidity sensor is going to be fairly critical, so it's on order at the dealer, and should be in tomorrow. Install takes about an hour (probably less, but the "book" will say an hour I'm thinking).
Hi The Mountain,

Glad to hear the source of your concern was able to be identified! If you are still experiencing any concerns once you have your Challenger back, feel free to send us a private message. Our team is always happy to provide an additional layer of assistance.

Mark
Dodge Social Care Specialist
 

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Discussion Starter #12
Well, the dealership dropped the ball. Even though I told them the day of the service to get started on getting the warranty approval, because they told me they could have the part next-day, they never called the warranty company. I had to call three times the next day for them to even get on the phone to the warranty people, and they didn't try to order the part until after 3pm. I guess someone else got to that sensor before me, because the service guy said they wouldn't get the new sensor for 3-5 days. Since I'm leaving for Houston on Saturday and not coming back, that is of no help to me. So now I'm out the diagnostic fee until I can convince some dealer down in TX to do the work, and I have to do the drive with the AC on the fritz.

If you're in the New England area and need service, I would recommend staying away from Lia Dodge in Northampton MA.

They forgot to reset the oil life meter when they changed my oil, too.
 

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Discussion Starter #13
Update: I wrote a polite and detailed email to the dealership General Manager, with a CC to the Service manager, explaining what had happened. The General Manager responded within an hour even though it was after business hours, and apologized for the whole thing. She will refund me the cost of the diagnostic AND the oil change, and is at least going to see if there's any way to get that humidity sensor in time to repair before my trip. She said the dealership was "making some changes to personnel in the Service Department", apparently because of issues with performance standards.

I will go tomorrow to collect the refund, which I'm grateful for. Hopefully she'll get lucky (another dealer in the area claimed to be able to get the part within a day, but had no appointments available until well into next week). In any case, I appreciate the effort, and I would say give them a little time to get the right people in, but they might still be worth your time once they're ready, given the GM's seeming interest in running a reliable shop.
 

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Not sure if this is any use to you, but i had the same thing happen with my 2013 Caravan. I haven't gotten it fixed yet, but i have found a work around.

When it happens while driving, turn off the AC, turn the temp controls to mid position, and turn the fan speed to mid. After about 10 minutes, operation should return to normal. At least it does in my situation.
I have the same issue with my 2012 Challenger. I do the same thing and mine returns to normal
 
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