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Old 01-30-2018, 06:38 PM   #1
Join Date: Feb 2017
Posts: 85
Intermittent clicking from dash vac pump

So I was able to get an early start this year on pre maintenance before we head to Florida this March. I had an issue with only having the defroster working on the the dash switch. After much headache, I was able to locate and fix the issue.

All of the functions seem to be working as they should but, I noticed what sounded like a solenoid pulsing. I was able to locate were the noise was coming from. As it turns out, I believe it to be the vacuum pump that controls the opening of the different gates for defrost, floor, ac, etc. I took apart the black box under gen compartment and found that it is actually air that is cycling intermittently. I don't believe that this is normal unless maybe I just never noticed it before? It is not a steady leak but more of a pulsating leak. only happens with the ignition on. Any ideas? I am going to try and upload a video when I get home so that you can hear what I'm hearing.

Thank you in advance!
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Old 01-30-2018, 07:29 PM   #2
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jacwjames's Avatar
Monaco Owners Club
Join Date: Jun 2014
Posts: 11,982
My guess is that you have a leak in the vacuum system.

I was installing a Onan Auto start system on the generator which has a control box that is mounted in the vicinity of the generator. I mounted the box and soon afterwards noticed the same clicking. It turned out that I had loosened one of the vacuum lines.

Check around and see if you can find a line loose.
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 01-30-2018, 07:52 PM   #3
Join Date: Feb 2017
Posts: 85
When I was working on running the wiring down under the dash, I did have the heat/ac control completely unhooked. I don't hear any air leaks from around the dash so my guess would be that it would be one of the two lines that go to the vac pump?
2005 Allegro Bus 40QDP
Cummins ISL 400 (with Mods)
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Old 01-30-2018, 07:56 PM   #4
Join Date: Feb 2017
Posts: 85
Hopefully there is a visual on this video to get an idea of where the noise is coming from. I did have it apart and can feel air coming from what looks like a vent or something off of the pump. no line going to it.
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2005 Allegro Bus 40QDP
Cummins ISL 400 (with Mods)
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Old 02-12-2018, 02:51 PM   #5
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Join Date: Sep 2016
Posts: 1,055
what perfect timing your post is, marc! iíve got a 95 dynasty and last week was in the dash trying to sort out a ground issue (gauges go wonky when headlights are on and dimmer is rotated.) and darned if my coach didnít start in with a respirator-like sound ...

more things to learn, it seems.

thx for each of the above posts, very helpful.
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