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Old 02-20-2021, 12:08 PM   #1
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Location: Fort Collins, Colorado
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High pitched whistle-like sound in coach

New to us 2019 Thor Vegas 27.7.
During long test drive, all was fine.
Picked the MH up a week later, and 5 minutes into the drive home, a high-pitched whistle sound started.
Sound is definitely not coming from engine or engine bay.
Got home and parked, shut ignition off. Sound stops.
Turned ignition back on (not starting engine), sound starts again.
No flashing warning lights anywhere.
The sound is not really loud, but def. annoying.
The frustrating part is that several of us could not locate where the sound is coming from! Opened cabinet doors, EVERYTHING, cannot figure out where sound is coming from. Only when ignition on. Turned coach power off, sound still happens. Arghh.
Pulled all house fuses, turn all devices on/off, no change.
Finally determine sound is comings from heater area. Pulled covers off, disconnected any wires I could find, no change. Its like the noise is coming from an invisible source. Crazy.
Any thoughts? Its now starting to drive me nutz.
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Old 02-20-2021, 12:53 PM   #2
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Chassis heater or coach furnace?

Does adjusting the chassis heater blower change the pitch. Does the vegas have a chassis cabin air filter like an e450.
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Old 02-20-2021, 02:59 PM   #3
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Do you turn your radio off ?
My 2017 Axis radio runs on house battery power. It stays on with the key off.

Just a guess, but some rear cameras have microphones, and the noise transmits thru the radio speakers.

When you turn the key on, the rear and mirror cameras come on. If the radio is on, it may be what your hearing.
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Old 02-20-2021, 03:31 PM   #4
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Coach furnace, no change when furnace is running, fan on high or lo.
Thanks!
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Old 02-20-2021, 03:32 PM   #5
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Thanks, its def coming from heater/furnace area.
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Old 02-20-2021, 03:56 PM   #6
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Quote:
Originally Posted by bdrauch View Post
New to us 2019 Thor Vegas 27.7.
During long test drive, all was fine.
Picked the MH up a week later, and 5 minutes into the drive home, a high-pitched whistle sound started.
Sound is definitely not coming from engine or engine bay.
Got home and parked, shut ignition off. Sound stops.
Turned ignition back on (not starting engine), sound starts again.
No flashing warning lights anywhere.
The sound is not really loud, but def. annoying.
The frustrating part is that several of us could not locate where the sound is coming from! Opened cabinet doors, EVERYTHING, cannot figure out where sound is coming from. Only when ignition on. Turned coach power off, sound still happens. Arghh.
Pulled all house fuses, turn all devices on/off, no change.
Finally determine sound is comings from heater area. Pulled covers off, disconnected any wires I could find, no change. Its like the noise is coming from an invisible source. Crazy.
Any thoughts? Its now starting to drive me nutz.

Found cause, or so I think. I turned off the LP at the tank, noise stopped.
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Old 02-20-2021, 04:05 PM   #7
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Now you are in a good position to troubleshoot the problem, you can make it come or go as you try to find out where the leak is.

I assume you've checked the tightness of all the propane tank connections....

Was it turned COMPLETELY or just partial?
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Old 02-20-2021, 04:51 PM   #8
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I turned the valve to the fully closed position, and the sound stopped. I turn the valve back on, noise did not return.
Also, no alerts from the LP/CO detector, and no apparent smell at all.

I will now investigate how to remove/replaced whatever valve/regulator may be the culprit.

Thanks to all.
Cheers!
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Old 02-21-2021, 01:53 PM   #9
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Dang! It fooled me. Noise has resumed, seemingly after hitting a mild bump in the road.
Now, it does not matter if the main supply at the LP tank is on or off.
Simply turning the ignition key to "on" (but not starting), or to Accessory position, the high pitched tone resumes.
No blower fan running, turning chassis power off, to no effect.
Pulled cover off of furnace area, and at least I know its emanating from that area.
Pulled the outside access panel off, noise is much quieter, indicating whatever is making the noise is inside the coach, somewhere in the heat exchanger area.
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Old 02-22-2021, 04:56 AM   #10
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I think your fridge sits on top of your furnace and it is a two way. Could the sound be coming from the fridge?
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Old 02-22-2021, 09:27 AM   #11
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And it only happens when you turn to ignition switch to on? Fuel pump noise? You can't locate it inside....can you hear it outside the coach?

Bob
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Old 02-22-2021, 11:06 AM   #12
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Fixed!! It was a "stabilizer down" alarm. I extended the right stabilizer, found the sensor (its a slide-pin type), manipulated it by hand while the beep was occuring...sound stopped and started as I moved it.
Sprayed WD-40 on/in it, now seems to function as it should.
There are set-screws at the ends of the spiral-jack, which is what you can adjust if the "reach" of the screw does not depress the switch in enough. Both left and right jacks seemed to be adjusted ok.

I searched online Owners manual and paper manual for ANY info on "stabilizer down" warning. I must have missed it where it discussed these?


Thanks all -

Cheers
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Old 02-22-2021, 11:56 AM   #13
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Thanks for the update, always good to hear what fixes a problem.
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Old 02-23-2021, 02:49 AM   #14
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Good news! Thanks for posting result.
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