Feeling a new vibration - need help

[BLUCIFR]

2019 mustang Gt - about 48k miles

As of recently ive noticed that whenever i crank my AC up towards 5, 6, or 7 on the screen im feeling like a vibration in the cabin. I can even feel it on my steering wheel. Yesterday after i washed the car, i was hearing a fast repetitive flapping noise. (Almost like sticking a sheet of paper in a fan slightly) i was driving and trying to figure out where it was coming from. It sounded like it was coming from the glove box. I eventually turned the AC off and back on a few times and it stopped. Not sure if this is related to the heavy load of vibrations ive been noticing or not.

But anyway, i figured id stop by and drop a post on here before i head to work to maybe see if anybody had any possible resolutions. Could it be my compressor starting to go out? (Still getting cold air) Could it be the compressor mounting bolts? Im not sure and i havent had time to diagnose it yet ive been so busy, but at the same time ive never felt a heavy load on my vehicle from the AC before this week and im just trying to nip it in the butt.

Any advice helps, thank you!

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[Skye]

From the symptoms you describe, it sounds like something inside the cabin and dash is failing.

Removing the cabin filter could give you access to feel around or inspect at least some of the ducts. Given the miles and the location, it might be worthwhile to replace the filter anyway.

But from what you describe, it sounds like the cabin blower motor might be the issue. Or something has fallen up against it.

Removing the blower motor looks pretty simple. Three screws and one connector, all of which are readily accessible from underneath the passenger side of the dash. Could be a failing bearing, something making it off-balance, or debris. Once out, you could turn the fan on and see if the problem repeats. It'd also open up the internals of the ducting for more inspection.

 

[BLUCIFR]

From the symptoms you describe, it sounds like something inside the cabin and dash is failing.

Removing the cabin filter could give you access to feel around or inspect at least some of the ducts. Given the miles and the location, it might be worthwhile to replace the filter anyway.

But from what you describe, it sounds like the cabin blower motor might be the issue. Or something has fallen up against it.

Removing the blower motor looks pretty simple. Three screws and one connector, all of which are readily accessible from underneath the passenger side of the dash. Could be a failing bearing, something making it off-balance, or debris. Once out, you could turn the fan on and see if the problem repeats. It'd also open up the internals of the ducting for more inspection.

Thank you! I have a spare filter at the house i usually change the filter every 10k mi. I will change that and see what i can find.

Do u think that could also be causing the over loading feeling my vehicle is getting when cranking the AC full blast? Or more-so that flapping noise scenario?

 

[Cobra Jet]

If it’s inside the cabin it could be the HVAC blend door actuators dialing. They’re a known issue in some of Ford’s vehicles. They can get stuck or act erratic which may be the kiss you’re hearing.

Another issue could be the cabin air filter has deteriorated and is jammed up in the HVAC blower motor. Worst case and sometimes gross is if a rodent made it into the interior, made a nest in the HVAC ducting and then got lodged in the blower motor wheel… hey it happens…

As for your A/C compressor - known issue with these is the clutch assembly fails and worse case is it locks and shears the belt or it shears itself off the front of the compressor.

Here’s some threads for that and how to fix.

This thread was from another M6G Member where the failure turned out to be the A/C field coil/clutch head:
https://www.mustang6g.com/forums/threads/what-is-this-passenger-side-lower-main-pulley-ac.121072/

This thread has the info from the Ford shop manual for how to remove the clutch assembly/field coil:
https://www.mustang6g.com/forums/th...tentially-a-c-compressor.129712/#post-2686995

There is also this thread which discusses how to remove the A/C stretch belt (and an available Lisle tool to do it too):
https://www.mustang6g.com/forums/threads/ac-stretch-belt-help-please.175709/#post-3554880

 

[Skye]

Do u think that could also be causing the over loading feeling my vehicle is getting when cranking the AC full blast? Or more-so that flapping noise scenario?

The filter by itself, no. Removing the filter might give you some visuals or feels into the ducting. Just clearing the obvious. Thinking further...

Remove the filter and leave everything open. Put the car in accessory mode and turn the fan on. With the filter out, it might help define the location of the noise better. Be careful on battery power though. To be safe, with the filter out, go for a drive and replicate the issue. You could first try the filter out, fan only. Then, filter out, A/C and fan on.

The actuator doors throughout the dash have electronic controls. There's a chance one of the actuators is freaking out. That's possible. IDK if that'd be enough for a vibration to travel though.

If the filter out, listen for noise test doesn't help, I'd remove the fan and take a look. You could spin the fan with your hand or turn it on while out of the dash.

I feel if there was something in the engine bay going awry, while the sound could travel, I would not expect you to feel it in the steering wheel. Or you'd feel it in other places to, like the shift knob or console. That's why I think something with the fan is going on, that vibration traveling through the dash and towards the steering column. It reads like the A/C itself is working OK, it's just the sound/vibration issue.

 

[Skye]

is if a rodent made it into the interior, made a nest in the HVAC sucking and then got lodged in the blower motor wheel… hey it happens…

The recent GT350 salvage/repair thread highlighted that. Something dragged hellastuff into the cowling. It was a remarkable achievement.

 

[Joe Gonsalves]

My experience is, it's one of the blend door actuators. I had one with a broken tooth and it made a clicking sound and vibrated the dash. Ford made these things cheaply so they are brittle. Mine was stuck on defrost.

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