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Old 06-24-2014, 03:49 PM   #1
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What is this?? in the outside electrical Panel

when the ignition is on, this things buzzes like crazy...why? and what is it?
anybody know.
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Old 06-24-2014, 03:51 PM   #2
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post what you have: motorhome, fifth wheel, travel trailer.....year and model helps a lot....
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Old 06-24-2014, 04:00 PM   #3
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Looking at picture it appears that he has a Berkshire. Mine has made noise also, but then stopped.
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Old 06-24-2014, 04:01 PM   #4
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Originally Posted by fonzie View Post
post what you have: motorhome, fifth wheel, travel trailer.....year and model helps a lot....
sorry thought is was on my signature....Newbee

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Old 06-24-2014, 04:33 PM   #5
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Think it is the small air compressor for the air horn? May sound nutty, but ours sounded like a little motor running all the time, blew the horn a few times and it stopped. If you never honked your horn, it's loud!
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Old 06-24-2014, 04:42 PM   #6
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Does that pic on the wall behind it give you any hints?
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Old 06-24-2014, 05:02 PM   #7
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I am not familiar with Berkshire's, but could it be a water separator/filter for the diesel feeding the on board generator ?
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Old 06-24-2014, 05:11 PM   #8
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It's actually the compressor for the front dash HVAC system. The control doors that control air flow are powered by air. Likely one of your actuators had a leak. Try changing your front A.C. to off.
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Old 06-24-2014, 05:32 PM   #9
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Does that pic on the wall behind it give you any hints?
no.. i was hoping that too.
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Old 06-24-2014, 05:35 PM   #10
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It's actually the compressor for the front dash HVAC system. The control doors that control air flow are powered by air. Likely one of your actuators had a leak. Try changing your front A.C. to off.
i did try that.but nothing...it has 2 hose connections on the top..one is open nothing connected, the other has a small(vacuum) hose conected.
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Old 06-25-2014, 10:17 PM   #11
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What is this?? in the outside electrical Panel

It's a vacuum pump, it pulls a vacuum on that black plastic ball, that's the vacuum reservoir. It's usually used to actuate the blend door functions of the hvac stuff!

If the port that does not have a line hooked to it pulls a vacuum on your finger, it needs a hose on it, once it pulls a vacuum on the system it will turn off, if it continues to run because of a leak, it will eventually burn up or pop a fuse, seen them do both. Might look for a loose hose....


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Old 06-26-2014, 10:12 AM   #12
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Originally Posted by Dijoeboss View Post
It's a vacuum pump, it pulls a vacuum on that black plastic ball, that's the vacuum reservoir. It's usually used to actuate the blend door functions of the hvac stuff!

If the port that does not have a line hooked to it pulls a vacuum on your finger, it needs a hose on it, once it pulls a vacuum on the system it will turn off, if it continues to run because of a leak, it will eventually burn up or pop a fuse, seen them do both. Might look for a loose hose....


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ok i will check that thank you :-)
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