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fired up the car this morning to take it to a dealership in another town 45 miles away for a fourth opinion and after driving for awhile decided to turn the heater on... instantly something didn't seem right...

1. the fan speed works fine... the faster the fan speed, the more "whistling" sounds come out the vents, etc... but you can't actually feel any air movement... just hear high pitched whistling/weezing

2. you can turn from cold to hot but there isn't any hint of temp change coming from the vents, etc because you can't feel any air movement from them...

3. tried turning the selector knob from vent all the way clockwise to whatever setting that is with no changes at all... turned it back and forth a bunch of times with no change... just the weezing whistling sounds that increase and decrease with fan speed...

anybody have any ideas what i could possibly try? if not i'll end up taking it to my local dealership and let them have a look at it... i bought an extended warranty that i think is good till sometime in 2015 so i should be ok with that... last time i had the heat going was last fall when i put it away and everything worked fine then... 4800 miles and HVAC broken... :4-dontknow: cars!
 

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I've read where owners have had problems with either the actuator or the louver door linkage was not working properly.The door would get stuck on either the heat or ac side.
 

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Try pulling the fuses (rearest row) in the trunk or neg cable for a minute and give it try
SPOT ON MY MAN! :smileup: ended up pulling the negative battery lead off... it was too dark to see what i was doing with the fuse box cover to get it off plus the negative battery lead was easiest to get at... 10 mm wrench and a couple of turns... pulled the lead to the side, let it sit like that for a few minutes, re-tightened the lead, fired up the engine and tried the knobs... i actually instantly heard the blend door/damper door actuate the second i rolled the key to the on position... everything seems to be working as it should! thanks again for the great advice! probably saved me or the dealership from tearing the dash apart looking for a non existent problem... :4-looney:

which brings me to the question, what the hell? :4-dontknow: obviously something electronic resets itself but geez, that's strange... even though i start the car periodically over the winter, the battery did get run down enough that i had to jump it a few weeks ago and that probably had something to do with it... thanks again! :4-wavey:

:rep:

I've read where owners have had problems with either the actuator or the louver door linkage was not working properly.The door would get stuck on either the heat or ac side.
well that's what immediately came to my mind... a "plastic" linkage to the actuator door must have snapped due to coldness or something of the like... it just seemed (well it actually was) in a closed position and nothing i could do would change anything... glad it was just a simple fix and not had to tear anything apart... disconnecting the battery on a challenger is like duct tape... it'll fix everything! except maybe my timing chain recall...lol :smiledown: thanks for commenting! :wavey:
 

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SPOT ON MY MAN! :smileup: ended up pulling the negative battery lead off... it was too dark to see what i was doing with the fuse box cover to get it off plus the negative battery lead was easiest to get at... 10 mm wrench and a couple of turns... pulled the lead to the side, let it sit like that for a few minutes, re-tightened the lead, fired up the engine and tried the knobs... i actually instantly heard the blend door/damper door actuate the second i rolled the key to the on position... everything seems to be working as it should! thanks again for the great advice! probably saved me or the dealership from tearing the dash apart looking for a non existent problem... :4-looney:

which brings me to the question, what the hell? :4-dontknow: obviously something electronic resets itself but geez, that's strange... even though i start the car periodically over the winter, the battery did get run down enough that i had to jump it a few weeks ago and that probably had something to do with it... thanks again! :4-wavey:

:rep:



well that's what immediately came to my mind... a "plastic" linkage to the actuator door must have snapped due to coldness or something of the like... it just seemed (well it actually was) in a closed position and nothing i could do would change anything... glad it was just a simple fix and not had to tear anything apart... disconnecting the battery on a challenger is like duct tape... it'll fix everything! except maybe my timing chain recall...lol :smiledown: thanks for commenting! :wavey:
Although rare, its nice when it turns out to be something simple.
Glad that was the case. :smileup:
 

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I also had a similar problem that happened with the HVAC controls on my 2010 R/T. After a couple of times, the dealer ended up replacing the HVAC control head unit which seemed to resolve the problem. That was under the warranty period, so no clue what it would have cost. Maybe they can check to see if there is a tech service bulletin for that issue? I also had another electronic issue where the sun roof stopped working and the solution was to "reflash" the computer. Sounds like maybe this model year had bunch of electronic bugs?
 

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Discussion Starter #7
Although rare, its nice when it turns out to be something simple.
Glad that was the case. :smileup:
very rare indeed! another great example of the help and knowledge that comes from such a good group of people that make up the Z...

I also had a similar problem that happened with the HVAC controls on my 2010 R/T. After a couple of times, the dealer ended up replacing the HVAC control head unit which seemed to resolve the problem. That was under the warranty period, so no clue what it would have cost. Maybe they can check to see if there is a tech service bulletin for that issue? I also had another electronic issue where the sun roof stopped working and the solution was to "reflash" the computer. Sounds like maybe this model year had bunch of electronic bugs?
did you by chance try the battery disconnect when you were having HVAC problems or no? i would have never tried it myself if it were not for the suggestions on this forum... i'm just glad i didn't have to go through the hassle of having the dash tore up this time around... i still haven't had the sun roof quit working on me yet but i do remember reading the threads about it and i think about that every time i slide it back! :str:

because i have a custom tune on the car i surely don't want the dealership reflashing anything! boy would that create a lot of problems... :shakehead: i always tell them NOT to flash the car when it's in their care... hopefully they know better... but you never know... :4-dontknow:
 

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I did do the "reset" trick a couple of times. After I griped to the dealer about it, that is when they replaced the HVAC head unit which solved the problem. Don't know if there was a short or bad connection or whatever, but the issue never repeated itself.
 

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I had a similar problem, but it was just a temperature issue. The dealership knew exactly what it was and problem fixed in about 30 minutes. The Shop Foreman told me that somewhere along the Factory Production Line when the A/C & Heater Assembly is installed, the system would not be properly seated or installed. He said this was seen a lot in the 2013 models. But he didn't say anything about resetting the fuses or Negative terminal on the battery. He had to actually go into the ventilation system and reset the temperature control . . . whatever that means.

Anyways, glad your system works again. I swear, the guys here are probably Dodge Techs as they know their S*#%!
 

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