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Old 06-22-2022, 07:36 PM   #1
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Join Date: Nov 2021
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Bad AC noise and no zone 2 cooling

I thought I'd try the cooling functions while the coach is parked in our driveway and the temperatures are rising to the 80s and soon into the 90s.

I set zone 1 to cool and 70 degrees setpoint. The ac kicked in and the unit sounds fine and cold air blows out of the outlets. Then I set zone 2 the same way and that unit, the rear most, sounds like it is rattling and I'm not getting cold air blowing. It's rattling so loud I can hear it from the road and I have a pretty long driveway.

I'd love to hear ideas about what is wrong and what I have to do to get it fixed.


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Old 06-22-2022, 09:03 PM   #2
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Might be the fan blades (squirrel cage fan) may have broken apart.
Visual inspection would confirm.
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Old 06-23-2022, 05:16 AM   #3
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I would go up on the roof - take the cover off & inspect it.

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Old 06-23-2022, 06:41 AM   #4
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Unfortunately, if it is a Coleman Mach, the squirrel cage hangs a single spindle. You can easily tighten it and the compressor fan while you are up there.
You will need a Torx to remove the ac cover( at least on mine), a small socket with extension to remove the cover protecting the squirrel cage.
You will also need a Phillips or flat blade too.
Might need a small roll of foil tape if the old tape is compromised.
When Iím on the roof, I use a small bucket with tools and hoist it up with a line. THEN I have DW throw stuff up when I forget stuff
Replacement parts are available on Amazon.
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Old 06-23-2022, 06:43 AM   #5
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Agree with the prior two posts. The unit needs to be inspected to find the source of the noise and get it corrected. With no air coming out, I would also suspect the squirrel cage.
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Old Today, 10:07 AM   #6
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One of my Dometic A/C’s quit and made a horrible noise. Sounded like someone shoved a stick in the fan and no air movement. It was a bad condenser. Both fan and compressor on Dometics have a start condenser. Condenser was visibly swollen. Less than $100 fix. I posted a thread regarding the repair here. Hope it’s a similar quick fix for you.
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Old Today, 10:39 AM   #7
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I think you mean a capacitor
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cooling, noise

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