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Old 03-23-2013, 06:59 AM   #1
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strange sounds

2004 allegro with 6.8L V10. Started hearing sound (I think it's under dash), it's a whirling or grrring sound when I turn key to the on position before starting. I was told it might be the electric motor that runs brakes and steering in case of engine dying. If so is this good or bad??? We are new to this and just want to be sure everything is ok. We only drove it home from dealer then back to dealer to have roof ladder installed then home again, otherwise it's been setting in the driveway We only heard the sound when we started back home from dealer, but drove ok as far as I can tell. Any idea's?
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Old 03-23-2013, 07:18 AM   #2
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if it quits when you start your engine that is what it is. brakes and steering.
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Old 03-23-2013, 07:43 AM   #3
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This sound can also come from the vaccum lines to your heater. After you turn the ignition on and you hear the sound, start playing with the heater settings (AC, Max AC, Vent, Heat, Defrost). Set the dial to each heat option then wait a few seconds. If the noise stops then it is a leaking vacuum line---very common. Here is another post with pictures. vacuum line leak anyone? If this post doesn't work, do a search for vacuum line leak.

This started happening to my 2010 Meridian after only one year.
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Old 03-23-2013, 08:29 PM   #4
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Your motorhome has a hydroboost pump that provides hydraulic pressure to your brakes and steering in the event your engine dies. The sound you hear is the motor for the pump cycling when you turn on the ignition. Absolutely normal! The sound ends when the engine starts because the engine driven pump is now providing the needed pressure. No worries...normal.
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Old 03-27-2013, 05:06 PM   #5
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Quote:
Originally Posted by GGoodsell View Post
Your motorhome has a hydroboost pump that provides hydraulic pressure to your brakes and steering in the event your engine dies. The sound you hear is the motor for the pump cycling when you turn on the ignition. Absolutely normal! The sound ends when the engine starts because the engine driven pump is now providing the needed pressure. No worries...normal.
I agree, dealer never told me about the noise and the first time I just turned the key on, I thought I broke something
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Old 03-28-2013, 04:14 PM   #6
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I consider this a blessing! Since my Hurricane didn't do this, I asked about it during the initial walk-through after purchase. Was told that it was for the benefit of power steering and brake operation in case of engine failure. While the noise was disturbing when I first heard it, I am now very thankful for it. While I have never had a need for it so far, and hope I never do, I have read one or two threads where Thor owners have had their coach suddenly die due to bad BIRDs. (Don't know if they've changed, but my '12 Hurricane 32A didn't have it!).
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