when switching to "recirculate" instead of outside air

[Haas]

Every auto I've owned in the past, has had a slightly different sound to the air conditioning fan when switching from "outside air" to "recirculate". When changing to "recirculate", the fan usually sounds like it's blowing a little harder.

But on my ram, there's no difference at all from one to the other. Are they all like that, or is mine not working?

 

[Loudram]

Mine has a slight difference and the sound of the air will also change during the second or two it's changing.

 

[Haas]

Ok, sounds like mine's not doing what it's supposed to do. Any other way I can check it other than the sound of it?

 

[Gary2]

If these HVAC units are the same as some of the earlier ones I would advise slowing the fan speed down before changing the mode or recirculate switch position . It makes it easier for the motors to open and close the doors in the housing when its not fighting the force of the air blowing through. It used to be a problem not long ago and a bit of a pain it the butt to fix. I still do it just incase its still an issue , I prefer not to be the one to find out its still an issue

 

[Haas]

If these HVAC units are the same as some of the earlier ones I would advise slowing the fan speed down before changing the mode or recirculate switch position . It makes it easier for the motors to open and close the doors in the housing when its not fighting the force of the air blowing through. It used to be a problem not long ago and a bit of a pain it the butt to fix. I still do it just incase its still an issue , I prefer not to be the one to find out its still an issue

I never thought of that. It's a good point. I'll give that a try.

 

[kad]

Mine always sounds like it's running faster in the recirc mode even though the fan speed setting hasn't changed.

-K

 

[Haas]

Mine always sounds like it's running faster in the recirc mode even though the fan speed setting hasn't changed.

-K

Yes, exactly. That's what I'm used to hearing. Like the wind speed is gushing harder. But mine isn't doing that.

 

[BWL]

One thing of note is that if it's on defrost it will not switch to recirculate.

 

[Firetruck41]

If it's like many other vehicles, when you switch to recirc, the HVAC will get it's ”intake” air from under the passenger side dash. You may be able to see/hear it in that area if you look. I haven't looked at it on my Ram yet, but my other vehicles are that way.

 

[LoadedExpressRam]

Mine too was the same recently but when swapped my platic dash for a leather i noticed this large door like device just behind the upper and lower gloveboxes that seemed to be stuck in the open position. Not only did my ac blow harder when i closed it it blew colder. Not saying this is the problem you are experiencing but might be worth a look.

 

[Haas]

Mine too was the same recently but when swapped my platic dash for a leather i noticed this large door like device just behind the upper and lower gloveboxes that seemed to be stuck in the open position. Not only did my ac blow harder when i closed it it blew colder. Not saying this is the problem you are experiencing but might be worth a look.

Thanks for that info. I'll take a look at that. What did you do to un-stuck it? Or, what was it actually stuck on?

 

[LoadedExpressRam]

Thanks for that info. I'll take a look at that. What did you do to un-stuck it? Or, what was it actually stuck on?

Just pulled on the flap and it shut. Not sure if it will open and close now but i know it works better than what it was.

 

[Seth Richards]

I have noticed the same thing with my AC. I change it to recirc and don’t hear a difference in the air flow. I’ll have to look and see if the flaps are closing properly or not. Too much smoke out in my area right now