Nissan Armada & Infiniti QX56 Forums banner
1 - 6 of 6 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter · #1 ·
Mods: I'm so sorry if this is not the correct thread

2012 armada SV
Is our No heat and new mystery sound related?
Video with sound, new sound with ignition off to on & on to off. Lasts the same duration each time and happens nearly every time for about 2 weeks now. We obviously haven't needed the heater(summertime here in Idaho) until this morning, it's not working, ambient temp air and a/c air working. Are these two things related?
TIA if you've got ideas or links for me to start my investigation! We don't mind the new noise, but we do need heat in about a month here in Idaho!
 

·
Administrator
Joined
·
6,652 Posts
that sound could be coming form anywhere. have you listened outside of the car? sounds like the compressor for the air bags.

did you open the engine room hood and listened in there to see if you can pinpoint the sound? maybe related or not, difficult to tell over the internet. i assume your car drives normally and there are no overheating issues correct? air blows cold? what about the dual zone, does that work as expected? if you dont have heat, its possible the heater core is the culprit. there is a valve that moves to change the coolant flow i believe and maybe this is causing the sound too?
 

·
Registered
Joined
·
3 Posts
Our 2014 just started doing that. It's most likely the mixing valve. It's located on the firewall on the passenger side. It has two hoses coming into it. If you have the hood up you'll likely hear this guy making the noise. ours is at the mechanics getting changed out. Hopefully that's what it was and were back in business with the heater.
Automotive tire Motor vehicle Coil Automotive design Automotive fuel system
 

·
Registered
Joined
·
18 Posts
If you will use a small o-ring that will be tight on the lower gear shaft, it will fix the issue from happening again. As it moves, and driving vibrations, the gear works itself off the shaft. It’s a poor design, happened on both my Titans and my current Armada.
 

·
Registered
Joined
·
2 Posts
Discussion Starter · #6 ·
Problem solved. THANK YOU!!!

Heater core valve blender at the firewall was it.
The white gear on the motor shaft slipped up just as u/marctronixx, u/Bdub, & u/Armadafordada mentioned.
I fixed by placing some rc hobby rubber cement on the shaft and gear, and making extra sure this won't happen again, used the plastic washers the three screws come with on the valve body housing, placed them on the shaft to keep the gear from migrating up again, they must be made for this, they fit nearly perfectly. ;).
I had no idea that the valve would cycle when the vehicle powers up & down, now I know.

I really apologize for not replying sooner, busy life this time of year with 4 littles.
Also, I didn't get alerted about any replies via email except for the first response.
This sent me down the Hvac blender motor rabbit hole and reading up on how tight some of them are to get to without taking the whole dash apart.

What a relief to find they all work as intended and the problem was literally a 5min fix instead.

Thank you again.
I'm thrilled Facebook hasn't killed all the group think forums... Yet!

that sound could be coming form anywhere. have you listened outside of the car? sounds like the compressor for the air bags.

did you open the engine room hood and listened in there to see if you can pinpoint the sound? maybe related or not, difficult to tell over the internet. i assume your car drives normally and there are no overheating issues correct? air blows cold? what about the dual zone, does that work as expected? if you dont have heat, its possible the heater core is the culprit. there is a valve that moves to change the coolant flow i believe and maybe this is causing the sound too?
Thank you!

Our 2014 just started doing that. It's most likely the mixing valve. It's located on the firewall on the passenger side. It has two hoses coming into it. If you have the hood up you'll likely hear this guy making the noise. ours is at the mechanics getting changed out. Hopefully that's what it was and were back in business with the heater. View attachment 51789
Thank you! That was exactly it

If you will use a small o-ring that will be tight on the lower gear shaft, it will fix the issue from happening again. As it moves, and driving vibrations, the gear works itself off the shaft. It’s a poor design, happened on both my Titans and my current Armada.
Thank you! That was exactly it.
 
1 - 6 of 6 Posts
Top