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Old 11-06-2018, 04:43 PM   #1
Taking it as it goes
Join Date: Sep 2018
Posts: 14
Navion AC cover vibrating

The great news is that we just traded in our 4 year old Thor Class C for the Navion. I know there are always start up issues to resolve, but the quality control and attention to detail in the Navion brings a smile to my face that I never had with the Thor.

Anyway, this is defiantly a first world problem, but we get a loud vibration at highway speeds that seems to come from the cowling on the AC unit. Itís firmly attached as it should be but the cover is flexible and the wind can get beneath it.

I can visualize a couple of ways to prop the cover up to keep it from vibrating on the internal components, but wonder if anyone else with a new Navion has experienced the same thing and found a good work around?

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Old 11-06-2018, 06:31 PM   #2
Join Date: Jun 2015
Location: The hilly part of Texas
Posts: 286
Coleman Mach 8? Yeh.... they are a pooly designed bonnet. Suggestions: Newer Mach 8s should have an "elf ear" three blade condenser fan. There should be an inverted U shaped stand off on the top of the metal electrical box to support the shroud. (The elf ear fan and stand off were part of an upgrade "hush" kit in 2015. New units may, or may not, have the stand off!)

Here's the problem..... the stand off is too short to be effective. The fix here is to find a chunk of high density, foam like the tough stuff used in shipping packs. The weather proof stuff. A bit more than 1" tall & cut to be a little bigger than the top of the stand off. Stick it to the stand off with heavy duty 2 side sticky tape. If you got it right you will have to lightly compress the bonnet to get the bolts restarted.

Next.....the bonnet is flimsy resin. Very bendy. While you have it off... You need to do this NOT on the roof. Get some foil backed burly tape that is used to repair & seal a roof. And some HVAC aluminum foil tape. Now this will take a little time and care..... You want to line the underside of the bonnet with strips of butyl tape leaving about 4-5" bare around the inside edges. This will stiffen the bonnet. And! The tape will add some mass damping to knock off vibrations and sound. And!!!!! You get a bonus... it will add some thermal insulation to the underside of the bonnet and reduce the heat load on the AC.

Not that you asked.... Perfect Casitas has a fan speed reduction kit and a revised grill for the bonnet to reduce the absurd noise these units create. Sound damping the bonnet; elf ear fan (if you dont have it); revised vent & speed reduction will hush the sound of a J-97 in reheat down to the level of a vacuum used in a far room.
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