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Old 03-24-2016, 04:45 PM   #1
thesoundguy's Avatar
Join Date: Oct 2015
Location: Fort McDowell, AZ
Posts: 35
Is the roof air scoop functional?

Understand I am basically a new motor home owner, so this might seem like a dumb question, but I think the only dumb question is the one that didn't get asked.

My question is about the supposed rear air scoop on my 2000 Monaco Diplomat. When I tried to run a video cable for my rear facing camera, I thought I might be able to access a run down the air scoop into the engine compartment, and then on to the front of the motor home. I have an electricians metal fish tape and began pushing it through the metal grate up on the roof, but to no avail. It seemed that I could find a way into the compartment, the air cleaner, etc..

Now, comes my questions:
Where does this duct go, if anywhere?
Can I seal that up and endanger engine performance?

I'm having a rain leak problem in the very back of the motor home. I've tried sealing up everything on the roof, along the roof rails, at all the side panel seams, and also replaced the slide seal back there. It's not as bad, but still gets wet, and I'm wondering if it's leaking somehow through that fresh air duct.

Positive suggestions are appreciated. Wise a** remarks will be ignored.

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Old 03-24-2016, 05:06 PM   #2
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Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 12,658
I believe the air scoop is attached to your air filter. You could loosen the clamp on the filter and pull the intake flex tube off and see it the tape comes out there. The air intake is often high since it's in the rear and would be subject to road dust from the tires.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 03-24-2016, 10:22 PM   #3
"Formerly Diplomat Don"
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Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 7,225
"thesoundguy"....The air pick up at the top of the coach is typically a sealed box so that it only draws outside air. At it's base, a metal tube is connected that runs down to your air cleaner. Somewhere the pipe usually curves and there is a rubber flapper (low point) that allows water to drain out if ingested by the air pick up. It's the only air the engine gets, so don't cover it.

Here is a suggestion. Remove the air pick up grate and see if you can drill a cable sized hole near the base of the box. Run your cable through it and then seal with some silicone. This will get your cable alongside the metal air tube, but outside of it.

You could also remove a rear running light and see if you can get your fish tape down to the engine compartment. If it works, you can drill a hole near the center running light and run your cable down to the engine bay.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab
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Old 03-25-2016, 09:08 AM   #4
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Texas Boomers Club
Join Date: May 2012
Location: DFW, Tex-US
Posts: 3,517
Ditto on my Diplomat ---

Are you saying there is NOT an 8 inch or so diameter 'hose' down to your air cleaner ?!?!?
See mine in the 2nd pic coming in from the right?)

Even WITH that high intake I find my ac filter has ALL kinds of small 'rocks' that have dropped on the outside of the filter in the canister !!!
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If you really are sad and think nobody cares, just try missing a few payments ! '11 Monaco Diplomat 43DFT RR10R pushed by a Demco Excali-Bar II hitch which is pushed by a '14 Jeep Wrangler Unlimited Sport.
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