Fan howl noise on Mach 15 AC - fan spins but no cool air

TerrapinX

New Member
Joined
Sep 3, 2020
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3
Hi! This is my first post here. I read through some posts but didn't see this issue addressed. The rear AC, model Airxcel Coleman Mach 15, is making a weird howling noise starting it up for the first time since last summer. The fan spins but it's like it's not running at full speed or has a bad bearing. The fan makes the sound no matter if I run it on AC mode or fan mode.

The fan motors are very easy to replace (for me) but I would love to troubleshoot the issue before I assume it's the motor.

Does this issue sound familiar to anyone?

Could a start-up circuit cause the motor to receive less voltage and the howl is from a slow running motor?

Is it the bearings? (I read posts where People have temporarily oiled fan motor bearings to see if that's the issue).

Something else?

I have pulled the covers off and the AC unit is still very clean and I don't see any obvious issues - I observed the unit running with the covers off.

We have a 2021 Reflection 310 RLS, if that makes a difference. The AC barely has a few months of run time on it. It's a bone stock AC with no mods.

Thanks
TerrapinX
 
Thank you! That's a good tip.

I only had time today to pull the covers and do a visual inspection. I will head back up tomorrow with a multimeter and see what I find.

I will post what I find.
 

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